tmerritt
691b2bc23c
The first _wip project to get a real disassembly. 4,165 instructions /
8,444 code bytes (25.8%), 24,324 data bytes, 0 unclassified -- every byte
of the 32 KB PRG is now classified as code or data.
The split needed three stages, all recorded in prg.s's header:
* nesdis.py --undocumented --auto-seed at base $8000 gave 3,272
instructions / 6,555 bytes. The undocumented opcodes matter here: the
trace stops dead at the first one it cannot decode.
* Four hand-seeded entries ($C08B, $DC1E, $E0D5, $E134). Each is a
branch target from decoded code that sat inside an untraced data run,
so the tracer never reached it.
* A merged four-session Mesen Code Data Logger capture (kept as
xevious_mesen.cdl) promoted 1,902 bytes from data to code and
demoted 22 the trace had called code.
Two tool bugs fell out and are fixed here:
* nesdis.py emitted the undocumented single-byte NOPs ($1A/$3A/$5A/
$7A/$DA/$FA) as `nop`, which ca65 assembles as the *official* $EA --
the rebuild stopped being byte-identical at $DF82. The check now
keys on the opcode byte, not just the addressing mode. All three
`make regen` pipelines (MUSCLE, Pyramid, Urban Champion) are
unaffected and still reproduce prg.s byte for byte.
* cdl_reclass.py left the original data-block header in place when the
CDL split that block, so the file ended up with two region headers
describing overlapping spans (20 of them here). The header is now
dropped with the block it describes; the promoted projects that use
the tool are byte-for-byte unchanged.
The project README has the power-on flow analysis. The most interesting
find is at $FC45: the reset path compares RAM $0100-$0107 against the
ASCII string "Kei Cros", and the copyright text at $FF1E reads
"MAIN: KEI CROSS. SOUND: UHOHOY OHNOGI." The OAM is at $0700, not
$0200 -- the NMI handler does LDA #$07 / STA $4014.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Add explicit `make wip` / `make wipclean` targets for the _wip tier
The root Makefile's all / clean / <MAPPER> targets deliberately name only
the promoted mapper folders, so nothing in them reaches into _wip/. Give
the pre-promotion tier its own opt-in targets instead of the manual
`for d in _wip/*/*/; do make -C "$d"; done` loop:
make wip # build + verify every _wip/<MAPPER>/<Project>/
make wipclean # clean the build artifacts in that tier
Both the Makefile and the four documents that describe the tier (README,
TODO, WIP, AGENTS) are updated together, so the tree stays consistent.
The same commit records Xevious (U) reaching Pass 2 in those documents:
all 487 labels named, every branch and call symbolic, zero Label_XXXX and
zero raw $XXXX operands left.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Update the _wip/ tier documentation; fix the make wip target and the mirroring bug
The WIP tier's four documents (WIP.md, README.md, TODO.md, AGENTS.md) had
drifted away from the tree. Every number in them was re-derived from the
ROMs and the folder layout rather than carried forward.
Counts and structure
- The tier holds 854 projects across 29 mapper folders, not "856 across
30". Xevious (U) and Zanac (U) were promoted on 2026-10-20 and their
_wip/ folders were left behind as residue -- "git mv" moves only the
tracked files, so the old folder survived with its build artifacts and a
stale README. Both are removed now; the promotion procedure documents
the step so it does not recur.
- _wip/MAPPER8/ holds a copy of the already-promoted Mermaids of
Atlantis (U) and is excluded from every count and table.
- Pass 0 skeletons: 852 (was 855). Xevious (U) left the tier, so the
two projects with a real disassembly are Golf (JU) and Volleyball (U).
- PRG sizes 2 / 150 / 42 / 522 / 127 / 10 / 1; 226 projects with no CHR;
38 keep the CPU-address linker layout; 37 are mapper 0.
- Every inventory row was re-checked against its ROM: PRG/CHR size,
mirroring, all three vectors, and the battery / four-screen / footer
notes. 854 of 854 rows now match.
Fixes
- The root Makefile used $(WIP) but never defined it, so "make wip" and
"make wipclean" expanded to "for m in /*/" -- they walked the
filesystem root instead of the tier. "WIP := _wip" is now defined, and
"make wip" builds and verifies the whole tier: 855 of 855 passed, 0
failures.
- make_skeleton.py masked header byte 6 with 0x03, so the battery bit
(bit 1) leaked into the mirroring value and 56 battery-backed ROMs'
READMEs claimed "Four-screen" while their own "Four-screen VRAM" row
said "no". The mask is now 0x01 and the 56 READMEs are corrected.
- Golf (JU)'s README still described the pre-flatten copilot/ folder and
the old PRG-only compare; it now describes the whole-ROM build.
- Pyramid (U)'s audit comments are canonical again, so Golf (JU) is the
only project in the tree still on the pre-canonical spelling.
New in WIP.md
- Byte 7's lower nybble is non-zero on 58 of the ROMs -- 55 carry the
literal "DiskDude!" watermark, two "DisNi0330", one "byKH+KEN". Only
the upper nybble carries mapper bits, so the noise is harmless.
- The twelve ROMs that set the four-screen bit, split by whether their
board actually supports four-screen VRAM.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Promote Volleyball (U) from _wip/NROM/ to NROM/
Volleyball (U) reached Pass 3 before promotion, so this is a promotion of a
finished disassembly rather than a Pass 0 skeleton.
The disassembly
- 11,395 instructions / 23,926 code bytes (73.0 % of the PRG image),
8,842 data bytes, 0 unclassified.
- The split needed the game-state dispatch table at $85E1 declared to the
tracer (--table 85E1:11) -- without it only 66 % of the image traced --
plus a Mesen Code Data Logger capture taken while a random-input bot
played the attract demo, which promoted 1,757 bytes from data to code.
- Pass 2 named all 1,989 labels: 730 read out of the code by hand, 1,221
internal branch targets derived mechanically. Zero Label_XXXX, zero raw
$XXXX call or branch operands, zero SubC residue.
- Pass 3 named the zero page, the $0500 ball structure and all 37 data
blocks. apply_symbols.py --report: 0 pending substitutions, 0
multi-alias residue. align_audit_comments.py: no column drift.
- cdl_check.py cross-checks the finished prg.s against the capture: 0
CDL-code bytes not covered by an instruction, 0 CDL-data bytes that
start one.
- 29 neutral ZpXX zero-page slots remain, each with its reason recorded
in locals.inc, as the promotion rules allow.
The promotion
- git mv "_wip/NROM/Volleyball (U)" "NROM/Volleyball (U)". Mapper 0, so
it lands in NROM/. The whole-ROM build was already in place, so there
was no build surgery; the project builds byte-identically at its new
home and the old folder is gone (git mv moves the untracked build
artifacts too, so no residue was left behind).
- Root README.md: new inventory row 39 and a per-project detail section,
plus the WIP-tier counts. The detail sections for Xevious (U) and
Zanac (U) were numbered one too high against the inventory rows and
are now aligned; a leftover editing note in the same place is gone.
- WIP.md: the Volleyball row leaves the inventory, and the tier is now
853 projects across 29 mapper folders (36 in _wip/NROM/), 852 of them
Pass 0 skeletons. Golf (JU) is the only project left in the tier with
a real disassembly.
- TODO.md and AGENTS.md: the same counts, and the promoted tier is now
40 projects (39 under NROM/).
Verified: make wip builds and verifies the whole tier (854 of 854 passed,
0 failures) and make builds the promoted tier (39 of 39 passed).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Rename NROM/Pyramid (U) to NROM/Pyramid (U) (Sachen)
The promoted inventory row had read "Pyramid (U) (Sachen)" since the
project was promoted on 2026-10-20, but the folder was named "Pyramid (U)" --
so the row pointed at a folder that did not exist. The folder now matches
the row, and the project's own README title, its ROM file name
("Pyramid (U) (Sachen).nes") and the parenthetical convention the rest of
the promoted tier already uses (Popeye (JU) (PRG 0/1), Raid on Bungeling
Bay (U) [a2], Pac-Man (Tengen) (U)).
What changed inside the project
- The Makefile's regen target passes --project "Pyramid (U) (Sachen)", so
the tracer writes the matching header line. prg.s and locals.inc were
updated to that header line and nothing else -- the disassembly is
byte-identical to before.
- make regen still reproduces prg.s and locals.inc byte for byte.
- The project's README's build-verification line now names the new folder.
References updated: the root README.md (inventory prose, the row-33 detail
section, the build-status table, and the notable-observations bullet),
TODO.md (the promoted-projects table and the Pyramid notes) and AGENTS.md
(the recently-promoted list and the unlicensed-titles quirk).
Verified: make builds the promoted tier (39 of 39 passed) and the project
rebuilds byte-identically at its new path.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Rebuild Mermaids of Atlantis (U): bank-aware Pass 1, Pass 2/3 names
The promoted project did not build: a Pass 2 rename had been applied
half-way, leaving eight undefined symbols and two jumps that pointed at
the wrong routine, while the root README already claimed the project was
byte identical. The _wip copy still built, because it held the un-renamed
Pass 1 source.
The disassembly is now derived from the ROM itself, with the Mesen Code
Data Logger as the oracle for the code/data split:
* _tools/banked_dis.py traces every MMC3 bank separately, each with the CPU
window it is visible at, seeded from a CDL capture so the code a static
trace cannot reach is disassembled too. The CDL is the authority: a
decode the CPU never fetched is dropped, and so is the fall-through
behind a call whose target never returns (the game's dispatchers have
their jump table right behind the call).
* One segment per bank (PRG0..PRG7) with its own .org, so the assembler
knows the CPU address of every label while the linker still writes the
bytes to the bank's file offset. A flat segment cannot do both: a call
would encode the file offset instead of the CPU address.
* Pass 2 names every label - 494 routines, no Label_XXXX and no raw
$XXXX branch or jump operand left. Pass 3 applies 13 semantic zero-page
aliases and writes the routine headers.
* 8,075 bytes of code (12.3% of the 64 KB PRG), up from 200 bytes.
The banking turned out to be unusual and is documented: the fixed bank is
the fourth 8 KB bank (file $6000-$7FFF), not the last one, and the image
carries the reset stub and the vector table twice. The live NMI vector
is $808F - the frame handler - while the copy at the end of the image
names $8189, which is a BRK in the first half. The game's text table
lives at CPU $F1D6, which is the fixed window, and that is what settles
the question.
Also: the leftover _wip/MAPPER8 folder is removed, as it is for every
other promotion.
The project builds byte identical:
Byte-identical ROM verified.
Add CHANGELOG.md: the pass history of every project
A project goes through four milestones - Pass 1 (the code/data split),
Pass 2 (the labels replaced by names), Pass 3 (the semantic naming) and
Promotion (the move into the top-level mapper folder) - and the history
of those milestones was scattered over the commit log, the project
READMEs and the root README.
CHANGELOG.md gathers it: one section per project with a row for each
milestone, the date, and a sentence saying what the milestone produced.
The numbers are the ones the project README and the root README already
carry - instruction count, code coverage, named labels, semantic
zero-page aliases, named data tables - so a reader can see at a glance
which projects are done and which are not. Golf (JU), the only project
still in _wip/ with a real disassembly, is listed with its open
milestones, and the other 852 _wip/ projects are covered as a tier.
The requirement is now part of the workflow contract: PROMPTS.md gains a
"Pass 3: Changelog entry" section and a ninth checklist item, and
AGENTS.md points at the file. A milestone and its changelog row go in
the same commit, so the changelog and the source never disagree.
Balloon Fight (JU): repair the audit trail and complete the routine headers
The per-instruction audit trail was stale by two bytes from
ResetInitializationData ($C085) onward. 5,944 of the 6,007 comments named
the wrong CPU address and PRG offset, because the three-byte .byte "HAL"
signature at $C082-$C084 had been counted as one byte when the trail was
first generated - the routine headers and the linker labels were right all
along, so the source and its own headers disagreed with each other. The
trail was rebuilt from the ca65 -l listing with
_tools/repair_audit_comments.py, and every rewritten comment was re-checked
against prg.bin. The comments were also moved into the canonical column-35
field: they had sat two spaces after the mnemonic, with no column discipline
at all, unlike every other promoted project.
All 63 routine headers now carry a ; Clobbers: block, so the headers carry
the full template AGENTS.md describes. The blocks are derived, not written by
hand. The new _tools/derive_clobbers.py takes the opcode from the audit
comment's byte list, so the addressing mode is exact and a data directive is
never mistaken for an instruction; it resolves the operand through
locals.inc and symbols.inc to name what is written; it follows the real
control flow, so a jsr to another named entry is a call (the callee's
clobbers count) while a branch or a fall-through is not; and it models
register preservation, so NmiHandler reports *no register* - it saves and
restores A, X and Y around the frame - and FlushPpuCommandPreserved reports
only A, because X and Y come back unchanged.
Two tools changed. derive_clobbers.py is new. align_audit_comments.py had
an off-by-one: it tested the indented code length against 31 instead of
against 35, so code texts of 28-31 characters were never padded into the
column.
The change is comments only. The code text of all 8,538 lines is unchanged,
make still prints "Byte-identical ROM verified.", the 6,007 audit comments
still re-check against prg.bin, all 63 routine headers agree with the
instructions they describe, and every label agrees with reconstructed.lbl.
ReflectObjectYVelocity and UpdateSpecialObjectSystem moved out of locals.inc
and became labels in prg.s at their real addresses.
CHANGELOG.md becomes the repository's running log: a Pending list of the
changes to be put in the next commit, a History of the commits already made,
and the per-project milestone index at the end. The next commit's message is
written from the Pending entries, so the two cannot drift apart. PROMPTS.md
and AGENTS.md describe the new shape. WIP.md drops the _wip/MAPPER8/ note:
the folder held a copy of Mermaids of Atlantis (U) that had already been
promoted.
World Class Track Meet (U): Pass 1, the code/data split
Pass 1 is done. The split is 8,400 instructions / 18,028 code bytes (55.0 %)
of the 32 KB PRG, with 884 routine entries, 55 data blocks and 102 zero-page
aliases. The PRG is CNROM (mapper 3) and maps whole at $8000-$FFFF, so the
linker moved the PRG segment from a .nes file offset to $8000 and the build
still compares byte identical.
Four dispatch tables had to be seeded by hand. The event table at $F796 (5
entries) is read at $F780 and jumped to through `jmp ($001F)`. The three
push-pointer tables - $BFC4 (16 entries), $BFE4 (2) and $E5F2 (7) - push a
handler address and `rts` into it, and the 6502's `rts` adds one to the
address it pops, so each table stores the entry address minus one; the seeds
are the table values plus one. The tracer runs with --undocumented: the code
uses undocumented NMOS opcodes as ordinary code (ANC $37 at $BFF8, and the
RRA/RLA/SLO and NOP forms elsewhere). Seeding the tables takes the coverage
from 27.8 % to 55.0 %.
$C0BE-$C0C5 is forced back to data: the IRQ vector $C0C0 points into the
middle of the `jmp $C047` at $C0BE, and the game never executes CLI, so the
vector is dead. `make pass1` regenerates prg.s and locals.inc from prg.bin
and reproduces the committed prg.s byte for byte.
The project README records the split, the four dispatch tables, the dead IRQ
vector, the wrong CHR size field in the header, and what is still data. The
milestone index in CHANGELOG.md gains the project; WIP.md, README.md and
AGENTS.md follow the tier counts and the layout.
nesdis.py gains a --mapping-note option, so the header's "PRG mapped at" line
can describe a board that is not NROM - CNROM's whole 32 KB at $8000-$FFFF is
not "mirrored to the upper half".
Replaces runs of $00 and $FF with .res <run>, <byte>
Golf (JU) and World Class Track Meet (U): Pass 2/3 complete, promoted from _wip/
- World Class Track Meet (U) - Pass 2 complete: all 884 Label_<addr>
definitions replaced (651 semantic routine names + 233 Sub_<addr>), all 731
raw $XXXX jsr/jmp call operands resolved to symbolic labels, all branch
targets given role-based names; routinemap.tsv added; make stays
byte-identical.
- World Class Track Meet (U) - Pass 3 complete: 24 semantic zero-page
aliases applied via apply_symbols.py (0 residue), 78 neutral ZpXX slots
documented with reasons in locals.inc, all hardware-register operands use
symbols.inc names, project README rewritten with Pass 2/Pass 3 sections and
data-table inventory; promoted out of _wip/CNROM/.
- World Class Track Meet (U) - project README documents the five event-table
entries at $F796 and marks the olympics mode as not yet proven.
- Golf (JU) - audit comments converted from pre-canonical (; C000: A9 00)
to the canonical ; CPU:$C000 PRG:0000 A9 00 form at column 35; 4,156
comments re-aligned, comment/whitespace only, whole-ROM build stays
byte-identical.
- Golf (JU) - 339 internal branch-target Label_ labels given role-based names
via _tools/derive_branch_names.py; 0 raw $XXXX branch/jump operands remain.
- Golf (JU) - 275 zero-page operands substituted with locals.inc aliases via
apply_symbols.py; 0 residue; promoted out of _wip/NROM/.
- Xevious (U) - runs of $FF padding replaced with .res <count>, $FF in prg.s;
whole-ROM build stays byte-identical.
- Both projects promoted via git mv; leftover _wip/ folders removed; root
README.md inventory rows added; WIP.md rows removed.
World Class Track Meet (U): apply zero-page symbol substitutions
Run apply_symbols.py to substitute ZpXX zero-page operands with
semantic locals.inc aliases (SlotState, GameMode, etc.) at proven
sites; 0 residue, whole-ROM build stays byte-identical.
Xevious (U): re-split Pass 1 from the Mesen CDL and decode the data tables
- Xevious (U) - Pass 1 re-split from the Mesen CDL (xevious_mesen.cdl) with
_tools/cdl_reclass.py: 1,158 bytes data->code, 48 code->data, 42 labels
emitted and 3 branch targets labelled; code 11,321->12,455 bytes
(34.5%->38.0%), instructions 5,513->6,002. The 45 recovered entry points
are named Sub_XXXX, so no Label_XXXX remains; six CDL-silent raw call
operands are documented as residue.
- Xevious (U) - the 4,448-byte block at $A74B-$B8AA is split into six proven
tables: VramWritePtrTable (15 pointers), VramWriteData, DataStreamPtrTable
(16), ObjTilePtrTable (99), ObjTileData and DataStreamData. The $D833
pointer table is corrected to base $D833 (4 entries; the old ObjCodePtrTable
at $D834 was one byte late). $F957-$FAF5 is split into ObjSpeedTable,
ObjSpeedTable2, SpriteLayoutPtrTable (19) and SpriteLayoutData;
$FEE6-$FF1C into PaletteData and OamAttrTable. $F5D8 is decoded as
TextTileData (font tile indices: PLAYER, GAME OVER, READY, SOLVALOU, LEFT,
PAUSE); $F53C becomes AttrAddrTable, $F89E HandlerPtrTable and $EF3B
SpriteLayoutData2. Project README rewritten with the corrected stats, a
32-entry table inventory and the Pass 1 residue.
- _tools/cdl_reclass.py - preserve the data label(s) between a data-block
header and its first .byte row when the block stays data; the $DF78 split
dropped Data_DF78 and the rebuild failed with an undefined symbol.
- _tools/resolve_raw_branches.py - handle negative relative offsets
(beq *-$0B); the pattern only matched *+$NN and *$NN.
Docs: refresh the tier counts to 41 promoted / 851 _wip, add the WCTM row
- Docs - tier counts refreshed to the post-promotion state across AGENTS.md,
root README.md, WIP.md, TODO.md and CHANGELOG.md: 41 promoted projects
(38 under NROM/, plus CNROM/World Class Track Meet (U), UNROM/Zanac (U) and
MAPPER8/Mermaids of Atlantis (U)) and 851 _wip/ projects, every one of them
a Pass 0 skeleton. The stale "39/40 promoted", "853 _wip", "Golf (JU) is
still in _wip/" and "Golf is the last pre-canonical project" statements are
corrected.
- Root README.md - the promoted inventory gained the missing World Class Track
Meet (U) row (row 41, mapper 3, 32 KB PRG / 32 KB CHR), and the "All 38 are
mapper 0 / 16 KB PRG" sentence is replaced with the actual split (36 of the
41 rows are mapper 0 / 16 KB; Xevious and Volleyball are 32 KB, World Class
Track Meet is mapper 3, Zanac mapper 2 and Mermaids mapper 8).
113 KiB
113 KiB
_wip/ — the pre-promotion tier
851 projects across 29 mapper folders, every one of them building byte-identical to its original ROM.**
This file is the handoff for everything under _wip/<MAPPER>/<Project>/. The
promoted tier (41 projects — 38 under NROM/, plus CNROM/World Class Track Meet (U), UNROM/Zanac (U) and MAPPER8/Mermaids of Atlantis (U)) is
documented in README.md; this file covers the tier that is not promoted yet.
1. What the tier is
_wip/ mirrors the promoted tier's structure exactly — one flat folder per
project, under a folder named for the project's mapper:
_wip/
NROM/ 35 projects (mapper 0, plus one whose header byte 7 is ASCII)
MMC1/ 221 projects (mapper 1)
UNROM/ 97 projects (mapper 2)
CNROM/ 57 projects (mapper 3)
MMC3/ 239 projects (mapper 4)
MMC5/ 10 projects (mapper 5)
MAPPER7/ 39 projects (mapper 7)
... 22 more folders, one per remaining mapper
_wip/MAPPER8/was not part of this tier. It held a copy ofMermaids of Atlantis (U), which had already been promoted toMAPPER8/Mermaids of Atlantis (U)at the top level. It was a leftover of a promotion, not a project waiting for one, and it has been removed -Xevious (U),Zanac (U)andMermaids of Atlantis (U)were all promoted the same way and their_wip/folders are gone.
Each project folder is flat — no copilot/ subfolder:
| File | Purpose |
|---|---|
prg.s |
the disassembly (Pass 0: a single .incbin "prg.bin") |
header.s / chr.s / trailer.s |
the other ROM segments, as ca65 includes |
prg.bin / header.bin / chr.bin / trailer.bin |
the binary splits |
rom.nes |
a space-free copy of the original ROM, for cmp |
linker.cfg |
the MEMORY areas |
symbols.inc |
NES hardware register names |
locals.inc |
zero-page aliases |
Makefile |
build and byte-identity check |
README.md |
per-project ROM facts and open work |
2. The mapper folders
The mapper is read from the iNES header: byte 6's upper nybble holds mapper bits 0-3 and byte 7's upper nybble holds mapper bits 4-7. The folder name follows the repository's board vocabulary where it exists, and the mapper number otherwise.
| Folder | Mapper | Board | Projects |
|---|---|---|---|
NROM/ |
0 | NROM | 36 |
MMC1/ |
1 | MMC1 (SxROM) | 221 |
UNROM/ |
2 | UxROM — UNROM, non-battery | 97 |
CNROM/ |
3 | CNROM | 58 |
MMC3/ |
4 | MMC3 (TxROM) | 239 |
MMC5/ |
5 | MMC5 (MxROM) | 10 |
MAPPER7/ |
7 | AxROM | 39 |
MAPPER9/ |
9 | MMC2 (PxROM) | 2 |
MAPPER11/ |
11 | Color Dreams | 40 |
MAPPER13/ |
13 | — | 1 |
MAPPER34/ |
34 | BNROM (NINA-001) | 1 |
MAPPER41/ |
41 | — | 1 |
MAPPER47/ |
47 | — | 1 |
MAPPER64/ |
64 | Camerica | 6 |
MAPPER65/ |
65 | Codemasters | 27 |
MAPPER66/ |
66 | GxROM | 18 |
MAPPER67/ |
67 | — | 7 |
MAPPER68/ |
68 | — | 4 |
MAPPER69/ |
69 | — | 1 |
MAPPER71/ |
71 | FuROM | 12 |
MAPPER73/ |
73 | — | 1 |
MAPPER79/ |
79 | NINA-006/007 | 15 |
MAPPER99/ |
99 | — | 1 |
MAPPER105/ |
105 | — | 1 |
MAPPER113/ |
113 | — | 3 |
MAPPER118/ |
118 | TxSROM | 2 |
MAPPER119/ |
119 | — | 2 |
MAPPER228/ |
228 | Action 52 | 2 |
MAPPER232/ |
232 | — | 5 |
29 folders, 851 projects. There is no MAPPER8/ row: the only mapper-8
project, Mermaids of Atlantis (U), has already been promoted to
MAPPER8/Mermaids of Atlantis (U) at the top level and its _wip/ folder
has been removed (see the note in §1).
A board name in the "—" rows would be a guess, so the folder carries the
number instead. The assignments were spot-checked against known titles:
MAPPER7/ holds Battletoads and Beetlejuice (AxROM), MAPPER9/ holds
Punch-Out!! (MMC2), MAPPER228/ holds Action 52 and Cheetahmen 2,
MAPPER64/ holds Gyruss and Klax (Camerica), MAPPER79/ holds Double Strike
(NINA-006/007), and so on.
AOROM/ is empty on purpose. Mapper 2 is the UxROM family, and the
board split is by battery: AOROM is the battery-backed 32 KB board, UNROM the
non-battery one. Not one of the 97 mapper-2 ROMs in the store sets the
battery flag, so all of them are UNROM. AOROM/ would exist as an empty
placeholder if a battery-backed mapper-2 ROM turns up.
One project is filed against its header's mapper rather than its real
board. 1942 (JU) sits in _wip/NROM/ even though its header reads
mapper 64, because iNES byte 7 is the ASCII text DiskDude! — bytes 7
through 15 of that ROM are the string, and 'D' ($44) in byte 7 is what an
emulator picks up as mapper bits 4-7. The byte 6 upper nybble says 0, so the
intended mapper is 0. Filing it under MAPPER64/ would record the corruption
as a fact; the six genuine mapper-64 ROMs live in _wip/MAPPER64/.
3. Build and verification
Every project in this tier verifies at whole-ROM level: make links the
header, the PRG, the CHR and (where present) the footer, then compares the
result against rom.nes byte for byte.
$ cd "_wip/MMC3/Battletoads (U)" && make
ca65 -g -o header.o header.s
ca65 -g -o prg.o prg.s
ca65 -g -o chr.o chr.s
ld65 -C linker.cfg -m reconstructed.map -Ln reconstructed.lbl -o reconstructed.nes header.o prg.o chr.o
cmp reconstructed.nes rom.nes
Byte-identical ROM verified.
This is a change from the older tier convention, where _wip projects ran
cmp reconstructed_prg.bin prg.bin and the header and CHR were not proven.
The whole-ROM form is what the promoted tier uses, so promoting a project is
now just git mv plus the disassembly work — no build surgery.
The tier is not built by the root Makefile's all/clean/<MAPPER>
targets. MAPPERS := NROM AOROM CNROM MMC1 MMC3 MMC5 UNROM MAPPER8 names
only the promoted mapper folders. The tier has its own explicit targets, which
are the only way the root Makefile reaches _wip/:
make wip # build + verify every _wip/<MAPPER>/<Project>/
make wipclean # clean the build artifacts in the tier
Both targets are driven by WIP := _wip at the top of the root Makefile.
That variable has to be defined: an empty $(WIP) expands the loop to
for m in /*/, which walks the filesystem root instead of the tier.
The old manual loop still works as an equivalent:
for d in _wip/*/*/; do make -C "$d"; done
make wip is slow (851 sub-make invocations) but it is the tier's
end-to-end check, and it passed clean on 2026-10-21: 851 of 851 projects
built, 0 failures.
4. Two linker layouts
This is the one thing to know before touching a _wip/ project.
CPU layout — the PRG memory area sits at the CPU address the image is mapped at:
MEMORY {
HEADER: start = $0000, size = $0010, fill = yes;
PRG: start = $C000, size = $4000, fill = yes; # 16 KB NROM-128
CHR: start = $0000, size = $2000, fill = yes;
}
Used by the projects whose whole PRG really is mapped at one address: the
16 KB NROM-128 games and the 32 KB NROM-256 games (which are contiguous at
$8000-$FFFF and so link at start = $8000, size = $8000). 36 of the 851
projects use it — 33 NROM games at $8000, 1 at $C000 (Circus Charlie),
plus MMC1/Wrecking Crew (JUE) and MAPPER13/Videomation (U). The other 815
use the flat layout below.
Flat layout — the memory areas sit at file offsets in the .nes file,
not at CPU addresses:
MEMORY {
HEADER: start = $0000, size = $0010, fill = yes;
PRG: start = $0010, size = $180000, fill = yes; # 1536 KB PRG
CHR: start = $180010, size = $80000, fill = yes;
}
Used by everything else, and it is not a workaround — it is the correct model:
- A PRG image larger than 32 KB does not fit the 6502's 64 KB address
space. Most of this tier is 128 KB or 256 KB of PRG, so a contiguous
CPU window is impossible. The largest image here is
Action 52 (U) [!]at 1.5 MB of PRG and 512 KB of CHR. - A banked mapper never presents the whole image at once. MMC1, MMC3 and
the rest map the PRG into the CPU in banks, so "the PRG is at
$8000" is not a true statement about the file. The file offsets are true.
NROM/Bomberman (U) is the repository's precedent for the flat layout, and
_tools/verify_pass1.py already has a note about its linker start being a
file offset rather than a CPU address.
The flat layout is also the only one that scales: the same linker.cfg shape
works for a 16 KB PRG and for a 1.5 MB one.
Two further rules the layout depends on:
- ld65 writes the output file in MEMORY declaration order, not address
order. The areas must be declared in the order the bytes appear in the
.nesfile:HEADER, PRG, CHR, TRAILER. - Memory area sizes are hexadecimal.
size = $127is 295 bytes, not 127.
5. The states a project can be in
| State | Count | Meaning |
|---|---|---|
| Pass 0 skeleton | 851 | prg.s is a single .incbin "prg.bin". The folder shape and the build are proven; there is no disassembly yet. |
A Pass 0 project is not promotable: AGENTS.md requires a real
disassembly (Pass 1 or beyond) before promotion. The skeleton exists so that
the folder shape and the byte-identity contract are settled before the
disassembly work starts.
No project in this tier currently has a real disassembly. Volleyball (U)
reached Pass 3 here and moved to NROM/Volleyball (U) on 2026-10-21; Golf (JU)
and World Class Track Meet (U) followed on 2026-10-21, promoted to
NROM/Golf (JU)/ and CNROM/World Class Track Meet (U)/ respectively; the root
README.md carries their entries.
Three projects have left this tier since the last inventory: Xevious (U)
(Pass 1 + Pass 2 + Pass 3, promoted to NROM/) and Zanac (U) (Pass 1 +
Pass 2 + Pass 3, promoted to UNROM/), both on 2026-10-20, and
Volleyball (U) (Pass 1 + Pass 2 + Pass 3, promoted to NROM/) on
2026-10-21.
6. Inventory
All 851 projects, all byte-identical for the whole ROM.
_wip/CNROM/ — mapper 3 (57 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Adventures of Dino Riki (U) | 32 KB | 32 KB | Vertical | $8093 / $8000 / $808F | Pass 0 skeleton | |
| Alpha Mission (U) | 32 KB | 32 KB | Horizontal | $815D / $8042 / $8293 | Pass 0 skeleton | |
| Arkanoid (U) | 32 KB | 16 KB | Horizontal | $80A0 / $8000 / $809B | Pass 0 skeleton | |
| Arkista's Ring (U) [!] | 32 KB | 32 KB | Horizontal | $8057 / $8004 / $80F2 | Pass 0 skeleton | |
| Athletic World (U) | 32 KB | 32 KB | Horizontal | $FB74 / $F9F9 / $FFF0 | Pass 0 skeleton | |
| Back to the Future (U) | 32 KB | 32 KB | Horizontal | $8461 / $8033 / $8464 | Pass 0 skeleton | |
| Bandai Golf - Challenge Pebble Beach (U) | 32 KB | 32 KB | Vertical | $8436 / $83D3 / $8A77 | Pass 0 skeleton | |
| Battle Tank (U) | 32 KB | 32 KB | Horizontal | $E00B / $8000 / $F567 | Pass 0 skeleton | |
| Battleship (U) | 32 KB | 32 KB | Horizontal | $8000 / $8003 / $8006 | Pass 0 skeleton | |
| Bubble Bath Babes (UE) [!] | 32 KB | 64 KB | Vertical | $804D / $8000 / $8000 | Pass 0 skeleton | |
| Bump'n'Jump (U) | 32 KB | 32 KB | Horizontal | $81F9 / $8000 / $8000 | Pass 0 skeleton | |
| Castlequest (U) | 32 KB | 32 KB | Vertical | $C569 / $8225 / $C6B8 | Pass 0 skeleton | |
| Championship Bowling (U) [!] | 32 KB | 16 KB | Horizontal | $F260 / $F22A / $F22A | Pass 0 skeleton | |
| City Connection (U) | 32 KB | 32 KB | Vertical | $838D / $D000 / $842E | Pass 0 skeleton | |
| Dash Galaxy in the Alien Asylum (U) | 32 KB | 32 KB | Vertical | $919B / $90AC / $9295 | Pass 0 skeleton | |
| Destination Earthstar (U) | 32 KB | 32 KB | Horizontal | $C2A0 / $8000 / $D36F | Pass 0 skeleton | |
| Firehouse Rescue (U) | 32 KB | 32 KB | Vertical | $C006 / $C000 / $C03E | Pass 0 skeleton | |
| Friday the 13th (U) | 32 KB | 32 KB | Vertical | $80B7 / $8000 / $815B | Pass 0 skeleton | |
| Ghostbusters (U) | 32 KB | 32 KB | Horizontal | $8261 / $B104 / $82FA | Pass 0 skeleton | |
| Gotcha! (U) | 32 KB | 32 KB | Vertical | $B48B / $8000 / $8000 | Pass 0 skeleton | |
| Gradius (U) | 32 KB | 32 KB | Vertical | $806A / $8010 / $80BD | Pass 0 skeleton | |
| Hudson's Adventure Island (U) | 32 KB | 32 KB | Vertical | $B706 / $8000 / $B754 | Pass 0 skeleton | |
| I Can Remember (U) | 32 KB | 32 KB | Vertical | $B711 / $AEBC / $B714 | Pass 0 skeleton | |
| Jaws (U) [!] | 32 KB | 32 KB | Horizontal | $8A7B / $8100 / $8BB5 | Pass 0 skeleton | |
| Jaws (U) [a2] | 32 KB | 32 KB | Horizontal | $8A7B / $8100 / $8BB5 | Pass 0 skeleton | |
| John Elway's Quarterback (U) | 32 KB | 32 KB | Vertical | $8087 / $FF87 / $8087 | Pass 0 skeleton | |
| Joust (U) | 32 KB | 16 KB | Horizontal | $FEB2 / $FE50 / $FFC1 | Pass 0 skeleton | |
| Karate Kid, The (U) | 32 KB | 32 KB | Vertical | $8269 / $8000 / $8000 | Pass 0 skeleton | |
| King's Knight (U) | 32 KB | 32 KB | Horizontal | $BEB3 / $8E52 / $BF36 | Pass 0 skeleton | |
| Kings of the Beach (U) | 32 KB | 32 KB | Vertical | $FC74 / $FC24 / $FCC9 | Pass 0 skeleton | |
| Krazy Kreatures (U) [a1] | 32 KB | 32 KB | Vertical | $D929 / $E000 / $D994 | Pass 0 skeleton | |
| Kung-Fu Heroes (U) | 32 KB | 32 KB | Horizontal | $A742 / $A6D8 / $A6D8 | Pass 0 skeleton | |
| Last Starfighter, The (U) | 32 KB | 32 KB | Vertical | $8006 / $8081 / $8067 | Pass 0 skeleton | |
| Legend of Kage, The (U) | 32 KB | 32 KB | Horizontal | $88F9 / $8000 / $88F7 | Pass 0 skeleton | |
| Major League Baseball (U) | 32 KB | 32 KB | Vertical | $849B / $8000 / $8519 | Pass 0 skeleton | |
| Major League Baseball (U) [a1] | 32 KB | 32 KB | Vertical | $84A0 / $8000 / $851E | Pass 0 skeleton | |
| Mighty Bomb Jack (U) | 32 KB | 16 KB | Horizontal | $8073 / $8000 / $8073 | Pass 0 skeleton | |
| Milon's Secret Castle (U) | 32 KB | 32 KB | Vertical | $819F / $8000 / $FFF9 | Pass 0 skeleton | |
| Monster Truck Rally (U) | 32 KB | 32 KB | Vertical | $C00B / $B9A7 / $B9A7 | Pass 0 skeleton | |
| Ninja Kid (U) | 32 KB | 32 KB | Vertical | $8537 / $800A / $8549 | Pass 0 skeleton | |
| Paperboy (U) | 32 KB | 32 KB | Horizontal | $8006 / $8048 / $8047 | Pass 0 skeleton | |
| Peek-A-Boo Poker (UE) [!] | 32 KB | 64 KB | Horizontal | $8117 / $80CA / $80CA | Pass 0 skeleton | |
| Perfect Fit (U) | 32 KB | 32 KB | Vertical | $AC89 / $9100 / $AC8C | Pass 0 skeleton | |
| Puzznic (U) | 32 KB | 32 KB | Vertical | $8681 / $8000 / $86CF | Pass 0 skeleton | |
| Pyramid (U) (Sachen-Hacker) | 32 KB | 64 KB | Vertical | $97DA / $8800 / $8800 | Pass 0 skeleton | |
| Q-bert (U) | 32 KB | 32 KB | Horizontal | $CAF5 / $CA85 / $CB52 | Pass 0 skeleton | |
| Shooting Range (U) | 32 KB | 32 KB | Vertical | $8894 / $80A0 / $88DC | Pass 0 skeleton | |
| Solomon's Key (U) [!] | 32 KB | 32 KB | Horizontal | $8000 / $8C00 / $00FF | Pass 0 skeleton | |
| Spy Hunter (U) | 32 KB | 32 KB | Vertical | $8861 / $8100 / $8100 | Pass 0 skeleton | |
| Stadium Events (U) | 32 KB | 32 KB | Horizontal | $F843 / $F740 / $FFF0 | Pass 0 skeleton | |
| Star Force (U) | 32 KB | 32 KB | Vertical | $8003 / $80E0 / $80A2 | Pass 0 skeleton | |
| Star Soldier (U) | 32 KB | 32 KB | Vertical | $9F7D / $800A / $800A | Pass 0 skeleton | |
| Star Voyager (U) | 32 KB | 32 KB | Horizontal | $E2B0 / $8322 / $F79B | Pass 0 skeleton | |
| Super Team Games (U) | 32 KB | 32 KB | Horizontal | $FAA9 / $F977 / $FFF0 | Pass 0 skeleton | |
| T&C Surf Design (U) | 32 KB | 32 KB | Vertical | $814F / $8001 / $8000 | Pass 0 skeleton | |
| Tiger-Heli (U) | 32 KB | 32 KB | Horizontal | $80A9 / $8004 / $8004 | Pass 0 skeleton | |
| Track & Field (U) | 32 KB | 32 KB | Vertical | $806F / $8010 / $80DA | Pass 0 skeleton |
_wip/MAPPER105/ — mapper 105 (1 project)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Nintendo World Championships 1990 (U) [!] | 256 KB | none | Horizontal | $FF38 / $FE89 / $6010 | Pass 0 skeleton | battery |
_wip/MAPPER11/ — mapper 11 (40 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Adventures of Captain Comic, The (U) | 64 KB | 64 KB | Vertical | $FD7F / $FE9A / $FE96 | Pass 0 skeleton | |
| Baby Boomer (U) | 64 KB | 16 KB | Vertical | $850E / $FFE8 / $FFE8 | Pass 0 skeleton | |
| Bible Adventures (U) (V1.2) | 64 KB | 64 KB | Vertical | $FFC2 / $FFEA / $FFE9 | Pass 0 skeleton | |
| Bible Adventures (U) (V1.3) | 64 KB | 64 KB | Vertical | $FFBF / $FFE1 / $FFE0 | Pass 0 skeleton | |
| Bible Buffet (U) (Ver 6.0) | 128 KB | 128 KB | Vertical | $87D3 / $87C6 / $87E8 | Pass 0 skeleton | |
| Challenge of the Dragon (U) | 64 KB | 64 KB | Vertical | $FFC7 / $FFE3 / $FFE2 | Pass 0 skeleton | |
| Chiller (U) [!] | 32 KB | 32 KB | Horizontal | $BA3D / $FFA0 / $BACC | Pass 0 skeleton | |
| Crystal Mines (U) | 64 KB | 16 KB | Vertical | $FFC7 / $FFB8 / $FFC7 | Pass 0 skeleton | |
| Death Race (U) | 64 KB | 64 KB | Vertical | $83CF / $8000 / $8444 | Pass 0 skeleton | |
| Exodus (U) (V4.0) [!] | 128 KB | 128 KB | Vertical | $FFDB / $FFCC / $FFDB | Pass 0 skeleton | |
| Free Fall (U) (Prototype) [!] | 64 KB | 64 KB | Vertical | $FFBF / $FFE1 / $FFE0 | Pass 0 skeleton | |
| Galactic Crusader (Sachen) (U) | 32 KB | 32 KB | Horizontal | $D52B / $D2D5 / $D2D5 | Pass 0 skeleton | |
| Joshua (U) (Ver 5.0 CHR 6.0) | 128 KB | 128 KB | Vertical | $FFAF / $FFA0 / $FFAF | Pass 0 skeleton | |
| Joshua (U) (Ver 6.0) [!] | 128 KB | 128 KB | Vertical | $FFAF / $FFA0 / $FFAF | Pass 0 skeleton | |
| King Neptune's Adventure (U) | 64 KB | 64 KB | Vertical | $822C / $FFE8 / $FFE8 | Pass 0 skeleton | |
| King of Kings, The (U) (V1.1) | 128 KB | 128 KB | Vertical | $FFAE / $FFEA / $FFE9 | Pass 0 skeleton | |
| King of Kings, The (U) (V1.2) [!] | 128 KB | 128 KB | Vertical | $FFAE / $FFEA / $FFE9 | Pass 0 skeleton | |
| King of Kings, The (U) (V1.3) | 128 KB | 128 KB | Vertical | $FFB2 / $FFEE / $FFED | Pass 0 skeleton | |
| King of Kings, The (U) (V5.0 CHR 1.3) | 128 KB | 128 KB | Vertical | $FFB2 / $FFEE / $FFED | Pass 0 skeleton | |
| Master Chu & The Drunkard Hu (U) | 32 KB | 32 KB | Horizontal | $8080 / $8000 / $8000 | Pass 0 skeleton | |
| Maxi 15 (U) | 512 KB | 512 KB | Vertical | $FF8A / $FFAC / $FFAB | Pass 0 skeleton | |
| Maxi 15 (U) [a1] | 512 KB | 512 KB | Vertical | $FF8A / $FFAC / $FFAB | Pass 0 skeleton | |
| Menace Beach (U) | 64 KB | 64 KB | Vertical | $FFAF / $FFD7 / $FFD6 | Pass 0 skeleton | |
| Metal Fighter (U) | 32 KB | 32 KB | Horizontal | $80E1 / $8000 / $8000 | Pass 0 skeleton | |
| Metal Fighter (U) [a1] | 32 KB | 32 KB | Horizontal | $80E1 / $8000 / $8000 | Pass 0 skeleton | |
| Mission Cobra (U) | 32 KB | 16 KB | Horizontal | $C214 / $C0DC / $C214 | Pass 0 skeleton | |
| Moon Ranger (U) | 64 KB | 64 KB | Vertical | $851F / $FFE8 / $FFE8 | Pass 0 skeleton | |
| Operation Secret Storm (U) | 64 KB | 64 KB | Vertical | $FFC7 / $FFE3 / $FFE2 | Pass 0 skeleton | |
| P'radikus Conflict (U) | 64 KB | 64 KB | Vertical | $FDCF / $8000 / $FDCB | Pass 0 skeleton | |
| Pesterminator (U) | 64 KB | 64 KB | Vertical | $8219 / $FFE8 / $FFE8 | Pass 0 skeleton | |
| Raid 2020 (U) [!] | 64 KB | 32 KB | Vertical | $8236 / $FFE8 / $FFE8 | Pass 0 skeleton | |
| Robodemons (U) | 64 KB | 64 KB | Vertical | $82A9 / $FFE8 / $FFE8 | Pass 0 skeleton | |
| Secret Scout (U) | 64 KB | 64 KB | Vertical | $FFAF / $FFD7 / $FFD6 | Pass 0 skeleton | |
| Shockwave (U) | 32 KB | 32 KB | Vertical | $8357 / $8000 / $83C1 | Pass 0 skeleton | |
| Silent Assault (U) | 64 KB | 64 KB | Vertical | $8000 / $F700 / $F700 | Pass 0 skeleton | |
| Spiritual Warfare (U) (Ver 6.0) | 128 KB | 128 KB | Vertical | $876E / $8761 / $8783 | Pass 0 skeleton | |
| Spiritual Warfare (U) (Ver 6.1) | 128 KB | 128 KB | Vertical | $876E / $8761 / $8783 | Pass 0 skeleton | |
| Sunday Funday (U) | 128 KB | 128 KB | Vertical | $FD7A / $FD96 / $FD95 | Pass 0 skeleton | |
| Tagin' Dragon (U) | 32 KB | 16 KB | Vertical | $A67F / $8000 / $8000 | Pass 0 skeleton | |
| Wally Bear and the No Gang (U) | 128 KB | none | Vertical | $807C / $8000 / $80AB | Pass 0 skeleton |
_wip/MAPPER113/ — mapper 113 (3 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Deathbots (U) | 64 KB | 64 KB | Vertical | $FF90 / $FF82 / $FF82 | Pass 0 skeleton | |
| Rad Racket - Deluxe Tennis 2 (U) [!] | 32 KB | 32 KB | Horizontal | $81B3 / $FF00 / $FF00 | Pass 0 skeleton | |
| Rad Racket - Deluxe Tennis 2 (U) [a1] | 32 KB | 32 KB | Horizontal | $81B3 / $FF00 / $FF00 | Pass 0 skeleton |
_wip/MAPPER118/ — mapper 118 (2 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Goal! Two (U) | 128 KB | 128 KB | Vertical | $DFED / $FC6F / $E22B | Pass 0 skeleton | |
| Pro Sport Hockey (U) | 128 KB | 128 KB | Vertical | $F887 / $FD14 / $FA84 | Pass 0 skeleton |
_wip/MAPPER119/ — mapper 119 (2 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| High Speed (U) | 128 KB | 128 KB | Horizontal | $FF4F / $FFD6 / $FF82 | Pass 0 skeleton | |
| Pinbot (U) | 128 KB | 64 KB | Horizontal | $FF09 / $FF8C / $FF38 | Pass 0 skeleton |
_wip/MAPPER13/ — mapper 13 (1 project)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Videomation (U) | 32 KB | none | Vertical | $C018 / $FF90 / $C19B | Pass 0 skeleton |
_wip/MAPPER228/ — mapper 228 (2 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Action 52 (U) [!] | 1536 KB | 512 KB | Vertical | $8006 / $FFD8 / $8006 | Pass 0 skeleton | |
| Cheetahmen 2 (U) | 256 KB | 128 KB | Horizontal | $800C / $800F / $800C | Pass 0 skeleton |
_wip/MAPPER232/ — mapper 232 (5 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Quattro Adventure (U) | 256 KB | none | Vertical | $C007 / $C00A / $0000 | Pass 0 skeleton | |
| Quattro Arcade (U) | 256 KB | none | Vertical | $C007 / $C01A / $FFF9 | Pass 0 skeleton | |
| Quattro Sports (Aladdin) (U) | 256 KB | none | Vertical | $C007 / $C00A / $C00A | Pass 0 skeleton | |
| Quattro Sports (U) | 256 KB | none | Vertical | $C007 / $C00A / $C00A | Pass 0 skeleton | |
| Quattro Sports (V3 Plug-Thru Cart) (U) | 256 KB | none | Vertical | $C007 / $C00A / $C00A | Pass 0 skeleton |
_wip/MAPPER34/ — mapper 34 (1 project)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Impossible Mission 2 (U) | 64 KB | 64 KB | Horizontal | $8003 / $8006 / $8009 | Pass 0 skeleton |
_wip/MAPPER41/ — mapper 41 (1 project)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Caltron 6-in-1 (U) | 256 KB | 128 KB | Horizontal | $A7B3 / $83F0 / $8400 | Pass 0 skeleton |
_wip/MAPPER47/ — mapper 47 (1 project)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Super Spike V'Ball - Nintendo World Cup (U) [!] | 256 KB | 256 KB | Vertical | $FF5B / $FF82 / $E3AF | Pass 0 skeleton |
_wip/MAPPER64/ — mapper 64 (6 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Donkey Kong Classics (U) | 32 KB | 32 KB | Horizontal | $EE3F / $EDB7 / $EE8C | Pass 0 skeleton | |
| Gyruss (U) | 32 KB | 32 KB | Horizontal | $8341 / $82D7 / $838C | Pass 0 skeleton | |
| Klax (U) | 64 KB | 64 KB | Horizontal | $F57E / $FC59 / $E0C4 | Pass 0 skeleton | |
| Mystery Quest (U) | 32 KB | 32 KB | Horizontal | $8103 / $8000 / $8102 | Pass 0 skeleton | |
| Shinobi (U) | 128 KB | 128 KB | Horizontal | $E154 / $E000 / $E004 | Pass 0 skeleton | |
| Skull & Crossbones (U) | 128 KB | 64 KB | Horizontal | $E078 / $E003 / $0014 | Pass 0 skeleton |
_wip/MAPPER65/ — mapper 65 (27 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Adventures in the Magic Kingdom (U) | 128 KB | 128 KB | Horizontal | $C000 / $FFD8 / $C000 | Pass 0 skeleton | |
| Adventures in the Magic Kingdom (U) [a1] | 128 KB | 128 KB | Horizontal | $C000 / $FFD8 / $C000 | Pass 0 skeleton | |
| Bad News Baseball (U) | 128 KB | 128 KB | Horizontal | $C003 / $FFD0 / $FFD8 | Pass 0 skeleton | |
| Battle Chess (U) | 256 KB | none | Horizontal | $C4EF / $C000 / $C4EE | Pass 0 skeleton | |
| Battle of Olympus, The (U) | 128 KB | none | Vertical | $D430 / $FFDA / $FFDA | Pass 0 skeleton | |
| Blaster Master (U) | 128 KB | 128 KB | Horizontal | $EB7E / $FFF4 / $EB97 | Pass 0 skeleton | |
| Caveman Games (U) | 128 KB | 128 KB | Horizontal | $8006 / $FF50 / $8003 | Pass 0 skeleton | |
| Circus Caper (U) | 128 KB | 128 KB | Horizontal | $C003 / $FFD0 / $C006 | Pass 0 skeleton | |
| Cobra Command (U) | 128 KB | 128 KB | Horizontal | $C749 / $C000 / $C7D5 | Pass 0 skeleton | |
| Demon Sword (U) | 128 KB | 128 KB | Horizontal | $DF2A / $FFC0 / $DFAB | Pass 0 skeleton | four-screen flag |
| Dragon Fighter (U) | 128 KB | 128 KB | Horizontal | $C103 / $C000 / $C000 | Pass 0 skeleton | |
| Dusty Diamond's All-Star Softball (U) | 128 KB | 128 KB | Vertical | $D4F9 / $C001 / $D707 | Pass 0 skeleton | |
| Frankenstein - The Monster Returns (U) | 128 KB | 128 KB | Vertical | $C001 / $FFD8 / $C004 | Pass 0 skeleton | |
| Golf Grand Slam (U) | 128 KB | 128 KB | Horizontal | $C005 / $EFF1 / $C000 | Pass 0 skeleton | |
| Guerrilla War (U) | 128 KB | 128 KB | Horizontal | $C80D / $C000 / $C86B | Pass 0 skeleton | |
| Harlem Globetrotters (U) | 128 KB | 128 KB | Horizontal | $C7AF / $BFC5 / $C729 | Pass 0 skeleton | |
| Ikari 3 - The Rescue (U) | 128 KB | 128 KB | Horizontal | $C048 / $C000 / $C0C4 | Pass 0 skeleton | |
| Iron Tank (U) | 128 KB | 128 KB | Horizontal | $C21D / $C000 / $C306 | Pass 0 skeleton | |
| Magic of Scheherazade, The (U) | 128 KB | 128 KB | Vertical | $E3C9 / $E19B / $E19B | Pass 0 skeleton | |
| Monster Party (U) | 128 KB | 128 KB | Horizontal | $C1F3 / $FFD8 / $C0C0 | Pass 0 skeleton | |
| Muppet Adventure - Chaos at the Carnival (U) | 128 KB | none | Vertical | $D02A / $FFE0 / $D02A | Pass 0 skeleton | four-screen flag |
| Peter Pan & The Pirates (U) | 128 KB | 128 KB | Horizontal | $D577 / $C000 / $D7F3 | Pass 0 skeleton | |
| RoadBlasters (U) | 128 KB | 128 KB | Horizontal | $D9E8 / $CE7E / $DA4A | Pass 0 skeleton | four-screen flag |
| Sesame Street ABC (U) [a1] | 128 KB | 128 KB | Horizontal | $94C6 / $EC53 / $9372 | Pass 0 skeleton | |
| Sesame Street ABC (U) [a2] | 128 KB | 128 KB | Horizontal | $94C6 / $EC53 / $9372 | Pass 0 skeleton | |
| Ski or Die (U) | 128 KB | 128 KB | Horizontal | $E43B / $FFEA / $E48E | Pass 0 skeleton | |
| Willow (U) | 128 KB | 128 KB | Horizontal | $C080 / $FFE8 / $FFE8 | Pass 0 skeleton | battery |
_wip/MAPPER66/ — mapper 66 (18 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Black Bass USA, The (U) | 128 KB | none | Horizontal | $F6D0 / $F67A / $F67A | Pass 0 skeleton | |
| Conan (U) | 128 KB | none | Horizontal | $CAA6 / $CAFB / $CAE2 | Pass 0 skeleton | |
| Dragon Power (U) | 128 KB | 32 KB | Vertical | $FB07 / $FF88 / $FB0A | Pass 0 skeleton | |
| Dragon's Lair (U) | 128 KB | none | Vertical | $EB2B / $D4D8 / $F3BC | Pass 0 skeleton | |
| Gilligan's Island (U) | 128 KB | none | Horizontal | $FAF3 / $F9C7 / $C0C0 | Pass 0 skeleton | |
| Gumshoe (UE) | 128 KB | 32 KB | Vertical | $8047 / $E700 / $807C | Pass 0 skeleton | |
| Jackal (U) | 128 KB | none | Vertical | $C292 / $C23D / $C2EA | Pass 0 skeleton | |
| Kid Kool (U) | 128 KB | none | Vertical | $C154 / $C000 / $C154 | Pass 0 skeleton | |
| Legendary Wings (U) | 128 KB | none | Vertical | $C19D / $C100 / $C100 | Pass 0 skeleton | |
| Little Mermaid, The (U) | 128 KB | none | Vertical | $C000 / $FEC0 / $C000 | Pass 0 skeleton | |
| Loopz (U) | 128 KB | none | Horizontal | $C55C / $C000 / $C5B4 | Pass 0 skeleton | |
| Mega Man (U) | 128 KB | none | Vertical | $D4A8 / $C008 / $C008 | Pass 0 skeleton | |
| NFL Football (U) | 128 KB | none | Vertical | $C177 / $C001 / $C000 | Pass 0 skeleton | |
| Rush'n Attack (U) | 128 KB | none | Vertical | $C074 / $C008 / $C0C2 | Pass 0 skeleton | |
| Side Pocket (U) | 128 KB | none | Horizontal | $CE70 / $CDF9 / $CDF9 | Pass 0 skeleton | battery |
| Skate or Die! (U) | 128 KB | none | Vertical | $C072 / $C001 / $C0E2 | Pass 0 skeleton | |
| Super Mario Bros - Duck Hunt (U) | 64 KB | 16 KB | Vertical | $C086 / $8000 / $C000 | Pass 0 skeleton | |
| Thunder & Lightning (U) | 128 KB | 32 KB | Vertical | $FFCA / $FF50 / $FFCD | Pass 0 skeleton |
_wip/MAPPER67/ — mapper 67 (7 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Cybernoid - The Fighting Machine (U) | 32 KB | 32 KB | Vertical | $8003 / $8000 / $0000 | Pass 0 skeleton | |
| Jaws (U) [a1] | 32 KB | 32 KB | Horizontal | $8A7B / $8100 / $8BB5 | Pass 0 skeleton | |
| Karate Champ (U) | 32 KB | 32 KB | Horizontal | $82BB / $8033 / $8033 | Pass 0 skeleton | |
| Mickey Mousecapade (U) | 32 KB | 32 KB | Vertical | $8003 / $8000 / $8078 | Pass 0 skeleton | |
| Puzzle (U) [a1] | 32 KB | 32 KB | Horizontal | $F86E / $8000 / $8000 | Pass 0 skeleton | |
| Puzzle (U) [a2] | 32 KB | 32 KB | Horizontal | $F86E / $8000 / $8000 | Pass 0 skeleton | |
| Puzzle (U) [a3] | 32 KB | 32 KB | Horizontal | $F86E / $8000 / $8000 | Pass 0 skeleton |
_wip/MAPPER68/ — mapper 68 (4 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| After Burner (U) | 128 KB | 256 KB | Horizontal | $E596 / $DB25 / $DB25 | Pass 0 skeleton | |
| Crystalis (U) [a2] | 256 KB | 128 KB | Horizontal | $F3B6 / $F2A4 / $F443 | Pass 0 skeleton | battery |
| Shadowgate (U) | 128 KB | 128 KB | Horizontal | $ECA3 / $E800 / $EB49 | Pass 0 skeleton | battery |
| Startropics (U) | 256 KB | 256 KB | Vertical | $FFAD / $FFA0 / $FFB5 | Pass 0 skeleton |
_wip/MAPPER69/ — mapper 69 (1 project)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Batman - Return of the Joker (U) | 128 KB | 256 KB | Horizontal | $E1D0 / $E2E6 / $E2A9 | Pass 0 skeleton |
_wip/MAPPER7/ — mapper 7 (39 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Arch Rivals (U) | 128 KB | none | Horizontal | $8095 / $FFDC / $8367 | Pass 0 skeleton | |
| Battletoads (U) | 256 KB | none | Horizontal | $FF98 / $FFF2 / $FF3F | Pass 0 skeleton | |
| Battletoads Double Dragon (U) | 256 KB | none | Horizontal | $FF98 / $FFF2 / $FF72 | Pass 0 skeleton | |
| Beetlejuice (U) [!] | 128 KB | none | Horizontal | $FFEE / $FFE6 / $FFAC | Pass 0 skeleton | |
| Cabal (U) | 128 KB | none | Horizontal | $FFDE / $FFEE / $FF53 | Pass 0 skeleton | |
| Cabal (U) [a1] | 128 KB | none | Horizontal | $FFDE / $FFEE / $FF53 | Pass 0 skeleton | |
| Caesar's Palace (U) | 256 KB | none | Horizontal | $C000 / $FFB2 / $FFB2 | Pass 0 skeleton | |
| Captain SkyHawk (U) | 128 KB | none | Horizontal | $FFF9 / $FFEE / $FFF9 | Pass 0 skeleton | |
| Castle of Deceit (U) | 64 KB | 64 KB | Horizontal | $82A9 / $FFE8 / $FFE8 | Pass 0 skeleton | |
| Classic Concentration (U) | 256 KB | none | Horizontal | $C85D / $C854 / $C85C | Pass 0 skeleton | |
| Cobra Triangle (U) | 128 KB | none | Horizontal | $FE1A / $FF90 / $FFF2 | Pass 0 skeleton | |
| Danny Sullivan's Indy Heat (U) | 128 KB | none | Horizontal | $FB06 / $FFF0 / $FB2B | Pass 0 skeleton | |
| Deadly Towers (U) | 128 KB | none | Horizontal | $FD61 / $FCFA / $FCFA | Pass 0 skeleton | |
| Deathbots (U) [a1] | 64 KB | 64 KB | Horizontal | $FF90 / $FF82 / $FF82 | Pass 0 skeleton | |
| Digger - The Legend of the Lost City (U) | 128 KB | none | Horizontal | $8020 / $8018 / $8018 | Pass 0 skeleton | |
| Double Dare (U) | 256 KB | none | Horizontal | $8006 / $FFF0 / $805A | Pass 0 skeleton | |
| Hollywood Squares (U) | 256 KB | none | Horizontal | $D545 / $C1A0 / $FFF9 | Pass 0 skeleton | |
| Ironsword - Wizards & Warriors 2 (U) | 256 KB | none | Horizontal | $FFDD / $FF91 / $DA2F | Pass 0 skeleton | |
| Ivan Ironman Stewart's Super Offroad (U) | 128 KB | none | Vertical | $FFEC / $FFE4 / $FFBD | Pass 0 skeleton | |
| Jeopardy! (U) | 128 KB | none | Horizontal | $FE6F / $FF94 / $FE7E | Pass 0 skeleton | |
| Jeopardy! 25th Anniversary Edition (U) | 128 KB | none | Horizontal | $FE85 / $FF94 / $FE94 | Pass 0 skeleton | |
| Jeopardy! Junior Edition (U) | 128 KB | none | Horizontal | $E4B1 / $FF94 / $E4C0 | Pass 0 skeleton | |
| Marble Madness (U) | 128 KB | none | Vertical | $FF9C / $FFC4 / $FFC3 | Pass 0 skeleton | |
| NARC (U) | 128 KB | none | Horizontal | $8177 / $FFED / $8668 | Pass 0 skeleton | |
| Nightmare On Elm Street, A (U) | 128 KB | none | Horizontal | $FEB0 / $FFF0 / $FEDC | Pass 0 skeleton | |
| RC Pro-Am 2 (U) | 256 KB | none | Horizontal | $FF89 / $FF80 / $FF80 | Pass 0 skeleton | |
| Solar Jetman - Hunt for the Golden Warpship (U) | 256 KB | none | Horizontal | $FFE3 / $FF88 / $FF78 | Pass 0 skeleton | |
| Solstice (U) | 128 KB | none | Horizontal | $07FD / $FE00 / $FE26 | Pass 0 skeleton | |
| Time Lord (U) | 128 KB | none | Horizontal | $FF68 / $8025 / $FF30 | Pass 0 skeleton | |
| WWF Wrestlemania (U) | 128 KB | none | Horizontal | $F1B6 / $FF22 / $F1B6 | Pass 0 skeleton | |
| Wheel of Fortune (U) | 128 KB | none | Horizontal | $FC3B / $FF90 / $FC51 | Pass 0 skeleton | |
| Wheel of Fortune - Starring Vanna White (U) | 128 KB | none | Horizontal | $8472 / $FF95 / $FFA4 | Pass 0 skeleton | |
| Wheel of Fortune Family Edition (U) | 128 KB | none | Horizontal | $FC48 / $FF90 / $FC5E | Pass 0 skeleton | |
| Wheel of Fortune Junior Edition (U) | 128 KB | none | Horizontal | $FC48 / $FF90 / $FC5E | Pass 0 skeleton | |
| Who Framed Roger Rabbit (U) | 128 KB | none | Horizontal | $FFB4 / $FFF2 / $FFC3 | Pass 0 skeleton | |
| Who Framed Roger Rabbit (U) [a1] | 128 KB | none | Horizontal | $FFB4 / $FFF2 / $FFC3 | Pass 0 skeleton | |
| Wizards & Warriors (U) | 128 KB | none | Horizontal | $FF86 / $FFAF / $FFB7 | Pass 0 skeleton | |
| Wizards & Warriors 3 (U) | 256 KB | none | Horizontal | $FFDC / $FF75 / $FEE7 | Pass 0 skeleton | |
| World Games (U) | 128 KB | none | Horizontal | $07FD / $FF00 / $FFB4 | Pass 0 skeleton |
_wip/MAPPER71/ — mapper 71 (12 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Bee 52 (U) | 64 KB | none | Vertical | $CA53 / $C007 / $CC55 | Pass 0 skeleton | |
| Big Nose Freaks Out (Aladdin) (U) | 256 KB | none | Vertical | $C161 / $C20B / $C10A | Pass 0 skeleton | |
| Big Nose Freaks Out (U) | 256 KB | none | Vertical | $C161 / $C20B / $C10A | Pass 0 skeleton | |
| Big Nose the Caveman (U) | 256 KB | none | Vertical | $C028 / $C004 / $0000 | Pass 0 skeleton | |
| Dizzy The Adventurer (Aladdin) (U) | 128 KB | none | Vertical | $C007 / $C02D / $FFF9 | Pass 0 skeleton | |
| Fantastic Adventures of Dizzy, The (U) | 256 KB | none | Vertical | $D1A2 / $EC50 / $C378 | Pass 0 skeleton | |
| Fire Hawk (U) | 128 KB | none | Horizontal | $C301 / $C0A0 / $C492 | Pass 0 skeleton | |
| Linus Spacehead's Cosmic Crusade (Aladdin) (U) | 256 KB | none | Vertical | $C007 / $C01A / $0000 | Pass 0 skeleton | |
| Micro Machines (Aladdin) (UE) | 256 KB | none | Vertical | $0300 / $F6B0 / $0000 | Pass 0 skeleton | |
| Mig-29 Soviet Fighter (U) | 128 KB | none | Vertical | $C8C9 / $C090 / $C18B | Pass 0 skeleton | |
| Solstice (U) [a1] | 128 KB | none | Horizontal | $07FD / $FE00 / $FE26 | Pass 0 skeleton | |
| Stunt Kids (U) | 128 KB | none | Vertical | $D6CE / $C004 / $C004 | Pass 0 skeleton |
_wip/MAPPER73/ — mapper 73 (1 project)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Punch-Out!! (U) | 128 KB | 128 KB | Vertical | $A008 / $A000 / $A000 | Pass 0 skeleton | four-screen flag |
_wip/MAPPER79/ — mapper 79 (15 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Blackjack (U) | 32 KB | 64 KB | Vertical | $FF1A / $F000 / $F000 | Pass 0 skeleton | |
| Double Strike (U) (V1.0) | 32 KB | 32 KB | Vertical | $B081 / $FF00 / $B081 | Pass 0 skeleton | |
| Double Strike (U) (V1.1) | 32 KB | 32 KB | Vertical | $B081 / $FF00 / $B081 | Pass 0 skeleton | |
| Dudes With Attitude (U) | 32 KB | 32 KB | Vertical | $07FD / $8000 / $FFF9 | Pass 0 skeleton | |
| F-15 City War (U) | 32 KB | 32 KB | Horizontal | $F831 / $FFC0 / $8000 | Pass 0 skeleton | |
| F-15 City War (U) [a1] | 32 KB | 32 KB | Vertical | $F831 / $FFC0 / $8000 | Pass 0 skeleton | |
| Fire Hawk (U) [a1] | 128 KB | 128 KB | Horizontal | $0000 / $0100 / $92A0 | Pass 0 skeleton | |
| Krazy Kreatures (U) | 32 KB | 32 KB | Vertical | $D929 / $FE00 / $D994 | Pass 0 skeleton | |
| Puzzle (U) | 32 KB | 32 KB | Horizontal | $CDB6 / $D4A4 / $CCAB | Pass 0 skeleton | |
| Solitaire (U) | 32 KB | 32 KB | Vertical | $FF8E / $FF09 / $FF09 | Pass 0 skeleton | |
| Tiles of Fate (U) | 32 KB | 32 KB | Vertical | $80CF / $8000 / $8000 | Pass 0 skeleton | |
| Trolls on Treasure Island (U) | 32 KB | 32 KB | Vertical | $07FD / $FF72 / $FFF9 | Pass 0 skeleton | |
| Trolls on Treasure Island (U) [a1] | 32 KB | 32 KB | Vertical | $07FD / $FF72 / $FFF9 | Pass 0 skeleton | |
| Ultimate League Soccer (U) | 32 KB | 64 KB | Horizontal | $8028 / $8002 / $8002 | Pass 0 skeleton | |
| Venice Beach Volleyball (U) | 32 KB | 32 KB | Vertical | $8090 / $8001 / $8001 | Pass 0 skeleton |
_wip/MAPPER9/ — mapper 9 (2 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Mike Tyson's Punch-Out!! (U) (PRG 0) | 128 KB | 128 KB | Horizontal | $A008 / $A000 / $A000 | Pass 0 skeleton | |
| Mike Tyson's Punch-Out!! (U) (PRG 1) | 128 KB | 128 KB | Horizontal | $A008 / $A000 / $A000 | Pass 0 skeleton |
_wip/MAPPER99/ — mapper 99 (1 project)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Hot Slot (UE) | 32 KB | 64 KB | Horizontal | $809C / $8000 / $8000 | Pass 0 skeleton |
_wip/MMC1/ — mapper 1 (221 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| 720 (U) | 128 KB | none | Vertical | $C372 / $C000 / $E898 | Pass 0 skeleton | |
| AD&D Heroes of the Lance (U) | 128 KB | 128 KB | Horizontal | $C06B / $C000 / $C063 | Pass 0 skeleton | battery |
| AD&D Hillsfar (U) [!] | 256 KB | none | Horizontal | $C003 / $FFD8 / $FFD8 | Pass 0 skeleton | battery |
| Abadox (U) | 128 KB | 128 KB | Horizontal | $C47B / $FFB0 / $C58C | Pass 0 skeleton | |
| Addams Family - Pugsley's Scavenger Hunt, The (U) | 128 KB | 128 KB | Horizontal | $C303 / $FF80 / $C36C | Pass 0 skeleton | |
| Addams Family, The (U) | 128 KB | 128 KB | Horizontal | $0104 / $C000 / $0314 | Pass 0 skeleton | |
| Adventures of Bayou Billy, The (U) | 128 KB | 128 KB | Horizontal | $DC1A / $FFF2 / $DCD2 | Pass 0 skeleton | |
| Adventures of Lolo (U) [!] | 32 KB | 32 KB | Horizontal | $DC88 / $C000 / $DD04 | Pass 0 skeleton | |
| Adventures of Lolo 3 (U) | 128 KB | 128 KB | Horizontal | $D677 / $FFF0 / $D6E4 | Pass 0 skeleton | |
| Adventures of Rad Gravity, The (U) | 128 KB | 128 KB | Horizontal | $C000 / $C0EF / $C0EF | Pass 0 skeleton | |
| Adventures of Tom Sawyer (U) | 128 KB | 128 KB | Horizontal | $F89F / $FFD0 / $B1D1 | Pass 0 skeleton | |
| Air Fortress (U) | 128 KB | 32 KB | Horizontal | $D1C8 / $C000 / $C0BA | Pass 0 skeleton | |
| Airwolf (U) | 32 KB | 128 KB | Horizontal | $CC2C / $CBC3 / $CC39 | Pass 0 skeleton | |
| Al Unser Jr Turbo Racing (U) | 128 KB | 128 KB | Vertical | $E9E4 / $FF80 / $EA26 | Pass 0 skeleton | |
| Al Unser Jr Turbo Racing (U) [a1] | 128 KB | 128 KB | Vertical | $E9E4 / $FF80 / $EA26 | Pass 0 skeleton | |
| Al Unser Jr Turbo Racing (U) [a2] | 128 KB | 128 KB | Vertical | $E9E4 / $FF80 / $EA26 | Pass 0 skeleton | |
| All-Pro Basketball (U) | 128 KB | 128 KB | Vertical | $C26C / $FFD0 / $C2AD | Pass 0 skeleton | |
| American Gladiators (U) | 128 KB | 128 KB | Horizontal | $E400 / $FFF1 / $E46E | Pass 0 skeleton | |
| Anticipation (U) | 32 KB | 32 KB | Horizontal | $DEE5 / $FFDD / $DF24 | Pass 0 skeleton | |
| Attack of the Killer Tomatoes (U) | 128 KB | 128 KB | Horizontal | $CF63 / $FFF1 / $CFC4 | Pass 0 skeleton | |
| Back to the Future 2 & 3 (U) | 128 KB | 128 KB | Vertical | $C788 / $C000 / $C787 | Pass 0 skeleton | four-screen flag |
| Bad Street Brawler (U) | 128 KB | none | Vertical | $FA50 / $CF4C / $FB49 | Pass 0 skeleton | |
| Barbie (U) (Rev 3) | 128 KB | 128 KB | Horizontal | $CCD0 / $FFF1 / $CD19 | Pass 0 skeleton | |
| Barbie (U) (Rev X) | 128 KB | 128 KB | Horizontal | $CCCE / $FFF1 / $CD17 | Pass 0 skeleton | |
| Bard's Tale - Tales of the Unknown, The (U) [!] | 128 KB | none | Horizontal | $C350 / $C000 / $C000 | Pass 0 skeleton | battery |
| Barker Bill's Trick Shooting (U) | 64 KB | 128 KB | Horizontal | $C4EB / $C000 / $C000 | Pass 0 skeleton | |
| Baseball Simulator 1.000 (U) | 128 KB | 128 KB | Vertical | $F098 / $E600 / $F087 | Pass 0 skeleton | battery |
| Baseball Stars (U) | 128 KB | 128 KB | Horizontal | $CFB3 / $CC69 / $D026 | Pass 0 skeleton | battery |
| Bases Loaded (U) | 256 KB | 64 KB | Horizontal | $8359 / $FFB0 / $83A6 | Pass 0 skeleton | |
| Bases Loaded 2 (U) | 256 KB | 128 KB | Horizontal | $85F0 / $8001 / $8694 | Pass 0 skeleton | |
| Big Bird's Hide and Speak (U) | 256 KB | 128 KB | Horizontal | $DDC7 / $DE57 / $DE34 | Pass 0 skeleton | |
| Bigfoot (U) | 128 KB | 128 KB | Horizontal | $F256 / $EC8F / $F259 | Pass 0 skeleton | |
| Bill & Ted's Excellent Video Game Adventure (U) | 128 KB | 128 KB | Horizontal | $FFEE / $FFE0 / $FFF1 | Pass 0 skeleton | |
| Bionic Commando (U) | 256 KB | none | Vertical | $C058 / $FFE0 / $C0B2 | Pass 0 skeleton | |
| Blaster Master (U) (Prototype) | 128 KB | 128 KB | Vertical | $EB75 / $FFF4 / $EB8E | Pass 0 skeleton | |
| Bomberman 2 (U) | 128 KB | none | Horizontal | $C01D / $C003 / $C0AB | Pass 0 skeleton | |
| Boulder Dash (U) | 32 KB | 32 KB | Horizontal | $A2C7 / $FF80 / $A2F3 | Pass 0 skeleton | |
| Boy and His Blob - Trouble on Blobolonia, A (U) | 128 KB | 128 KB | Horizontal | $C86F / $FFBF / $C8D2 | Pass 0 skeleton | |
| Break Time (U) | 128 KB | 32 KB | Horizontal | $C571 / $8000 / $C5EE | Pass 0 skeleton | |
| Breakthru (U) | 128 KB | 128 KB | Horizontal | $C58F / $C000 / $C000 | Pass 0 skeleton | |
| Bubble Bobble (U) | 128 KB | 32 KB | Horizontal | $CE07 / $E882 / $CE61 | Pass 0 skeleton | |
| Bugs Bunny Crazy Castle, The (U) | 64 KB | 32 KB | Horizontal | $EF95 / $EC00 / $EE71 | Pass 0 skeleton | |
| Bugs Bunny Fun House (Prototype) (U) | 128 KB | 128 KB | Horizontal | $EF95 / $EC00 / $EE71 | Pass 0 skeleton | |
| Castlevania 2 - Simon's Quest (U) | 128 KB | 128 KB | Horizontal | $C046 / $FFD0 / $C096 | Pass 0 skeleton | |
| Chessmaster, The (U) | 128 KB | 32 KB | Horizontal | $07FD / $C000 / $C134 | Pass 0 skeleton | |
| Chip 'n Dale Rescue Rangers (U) [!] | 128 KB | 128 KB | Horizontal | $C000 / $FFE0 / $FFE0 | Pass 0 skeleton | |
| Chip 'n Dale Rescue Rangers 2 (U) | 128 KB | 128 KB | Horizontal | $C003 / $FFE0 / $FFE0 | Pass 0 skeleton | |
| Clash At Demonhead (U) | 128 KB | 128 KB | Horizontal | $FF00 / $C100 / $FF00 | Pass 0 skeleton | |
| Clash At Demonhead (U) [a1] | 128 KB | 128 KB | Horizontal | $FF00 / $C100 / $FF00 | Pass 0 skeleton | |
| Conflict (U) [!] | 128 KB | 128 KB | Horizontal | $C01B / $C000 / $C01B | Pass 0 skeleton | |
| Cool World (U) | 128 KB | 128 KB | Horizontal | $0104 / $C000 / $0314 | Pass 0 skeleton | |
| Dance Aerobics (U) | 64 KB | 32 KB | Horizontal | $FC76 / $FFD8 / $C0C0 | Pass 0 skeleton | |
| Darkman (U) | 128 KB | 128 KB | Horizontal | $F5DC / $FF60 / $F633 | Pass 0 skeleton | |
| Darkwing Duck (U) | 128 KB | 128 KB | Vertical | $C000 / $FFE0 / $FFE0 | Pass 0 skeleton | |
| Darkwing Duck (U) (Prototype) | 128 KB | 128 KB | Vertical | $C000 / $FFE0 / $FFE0 | Pass 0 skeleton | |
| Day Dreamin' Davey (U) | 256 KB | 128 KB | Horizontal | $C009 / $BFB0 / $FFDB | Pass 0 skeleton | |
| Defender of the Crown (U) | 256 KB | none | Vertical | $C0C9 / $C000 / $C0DF | Pass 0 skeleton | |
| Desert Commander (U) | 128 KB | 128 KB | Horizontal | $E8E9 / $FFED / $F74E | Pass 0 skeleton | |
| Destiny of an Emperor (U) | 256 KB | none | Horizontal | $EE79 / $FFD8 / $EE79 | Pass 0 skeleton | battery |
| Die Hard (U) | 128 KB | 128 KB | Horizontal | $C207 / $C000 / $C2E4 | Pass 0 skeleton | |
| Double Dragon (U) | 128 KB | 128 KB | Vertical | $FF16 / $FFE8 / $E165 | Pass 0 skeleton | |
| Dr Jekyll and Mr Hyde (U) | 128 KB | 32 KB | Horizontal | $D0FF / $D066 / $D257 | Pass 0 skeleton | |
| Dr Mario (JU) | 32 KB | 32 KB | Horizontal | $8005 / $FF00 / $8035 | Pass 0 skeleton | |
| Dr Mario (JU) [a1] | 32 KB | 32 KB | Horizontal | $8005 / $FF00 / $8035 | Pass 0 skeleton | |
| Dr Mario (JU) [a2] | 32 KB | 48 KB | Horizontal | $8005 / $FF00 / $8035 | Pass 0 skeleton | |
| Drac's Night Out (Prototype) (U) [!] | 128 KB | 128 KB | Horizontal | $C06A / $C000 / $C099 | Pass 0 skeleton | |
| Dragon Warrior (U) (PRG 0) | 64 KB | 16 KB | Horizontal | $FE67 / $FFD8 / $FD3A | Pass 0 skeleton | battery |
| Dragon Warrior (U) (PRG 1) | 64 KB | 16 KB | Horizontal | $FE67 / $FFD8 / $FD3A | Pass 0 skeleton | battery |
| Dragon Warrior 2 (U) | 256 KB | none | Horizontal | $C000 / $FFD7 / $C5AB | Pass 0 skeleton | battery |
| Dragon Warrior 3 (U) | 512 KB | none | Horizontal | $C96C / $FFD8 / $E864 | Pass 0 skeleton | battery |
| Dragon Warrior 4 (U) | 512 KB | none | Horizontal | $0502 / $FFD8 / $C408 | Pass 0 skeleton | battery |
| Dungeon Magic - Sword of the Elements (U) | 128 KB | 128 KB | Vertical | $C0BE / $C000 / $C000 | Pass 0 skeleton | battery |
| Dynowarz - Destruction of Spondylus (U) | 128 KB | 128 KB | Horizontal | $C982 / $C05B / $C981 | Pass 0 skeleton | |
| Eliminator Boat Duel (U) | 128 KB | 128 KB | Horizontal | $C003 / $FFBC / $C003 | Pass 0 skeleton | |
| Evert & Lendl Top Player's Tennis (U) | 128 KB | 128 KB | Horizontal | $F918 / $FFBE / $F9E5 | Pass 0 skeleton | |
| Family Feud (U) | 32 KB | 128 KB | Horizontal | $CA5E / $D136 / $CAC3 | Pass 0 skeleton | |
| Faria (U) | 128 KB | 128 KB | Horizontal | $CF35 / $FFD0 / $FFD0 | Pass 0 skeleton | battery |
| Faxanadu (U) | 256 KB | none | Vertical | $C999 / $C913 / $C9D5 | Pass 0 skeleton | |
| Ferrari - Grand Prix Challenge (U) [!] | 128 KB | 128 KB | Horizontal | $0104 / $C000 / $0314 | Pass 0 skeleton | |
| Fester's Quest (U) | 128 KB | 128 KB | Horizontal | $C364 / $FFF3 / $FFF3 | Pass 0 skeleton | |
| Fester's Quest (U) (Prototype) | 128 KB | 128 KB | Vertical | $C36A / $FFF3 / $FFF3 | Pass 0 skeleton | |
| Final Fantasy (U) | 256 KB | none | Horizontal | $FE9C / $FE2E / $FEBB | Pass 0 skeleton | battery |
| Final Fantasy (U) [a1] | 256 KB | none | Vertical | $FE9C / $FE2E / $FEBB | Pass 0 skeleton | battery |
| Flying Warriors (U) | 128 KB | 128 KB | Horizontal | $F4CD / $F436 / $F462 | Pass 0 skeleton | |
| Formula One Built To Win (U) [!] | 128 KB | 128 KB | Horizontal | $F853 / $FFD5 / $FFFF | Pass 0 skeleton | battery |
| Freedom Force (U) [!] | 128 KB | 128 KB | Horizontal | $F08B / $FFF3 / $FFF3 | Pass 0 skeleton | |
| Genghis Khan (U) | 256 KB | none | Horizontal | $C0D9 / $C000 / $C14B | Pass 0 skeleton | |
| Ghostbusters 2 (U) | 128 KB | 128 KB | Horizontal | $FEF0 / $8000 / $FFF5 | Pass 0 skeleton | |
| Ghoul School (U) | 128 KB | 128 KB | Vertical | $C2B9 / $FFF1 / $C324 | Pass 0 skeleton | four-screen flag |
| Goal! (U) | 256 KB | 128 KB | Horizontal | $07FD / $FFB9 / $FFDF | Pass 0 skeleton | |
| Godzilla - Monster of Monsters! (U) | 128 KB | 128 KB | Horizontal | $C003 / $C000 / $C006 | Pass 0 skeleton | |
| Godzilla 2 - War of the Monsters (U) | 128 KB | 128 KB | Horizontal | $FA00 / $FFF0 / $FFF0 | Pass 0 skeleton | |
| Golgo 13 - Top Secret Episode (U) | 128 KB | 128 KB | Horizontal | $C081 / $C000 / $C081 | Pass 0 skeleton | |
| Great Waldo Search, The (U) | 128 KB | 128 KB | Horizontal | $EC31 / $FF40 / $ED24 | Pass 0 skeleton | |
| Greg Norman's Golf Power (U) | 128 KB | none | Horizontal | $E155 / $FFF3 / $E398 | Pass 0 skeleton | battery |
| Hatris (U) | 128 KB | none | Horizontal | $C20B / $C000 / $C292 | Pass 0 skeleton | |
| Heavy Shreddin' (U) | 128 KB | 128 KB | Horizontal | $8003 / $FFCB / $82FF | Pass 0 skeleton | |
| Hook (U) | 128 KB | 128 KB | Horizontal | $E09B / $FF64 / $E106 | Pass 0 skeleton | |
| Hoops (U) | 128 KB | 128 KB | Horizontal | $E13C / $FFD0 / $E17D | Pass 0 skeleton | |
| Hudson Hawk (U) | 128 KB | 128 KB | Horizontal | $C010 / $FE52 / $C013 | Pass 0 skeleton | |
| Ikari Warriors 2 - Victory Road (U) | 256 KB | none | Horizontal | $C000 / $FF40 / $51DF | Pass 0 skeleton | |
| Indiana Jones and the Last Crusade (Taito) (U) | 256 KB | none | Horizontal | $07FD / $FF00 / $FFF9 | Pass 0 skeleton | |
| Journey to Silius (U) | 128 KB | 128 KB | Horizontal | $C151 / $FFF3 / $FFF3 | Pass 0 skeleton | |
| Kid Icarus (UE) | 128 KB | none | Vertical | $C866 / $FF80 / $FFCC | Pass 0 skeleton | |
| Kid Niki - Radical Ninja (U) (PRG 0) | 256 KB | none | Horizontal | $8020 / $FFCE / $FFCE | Pass 0 skeleton | |
| Kid Niki - Radical Ninja (U) (PRG 1) [!] | 256 KB | none | Vertical | $8020 / $FFC8 / $FFC8 | Pass 0 skeleton | |
| Knight Rider (U) | 64 KB | 128 KB | Horizontal | $D362 / $C6EC / $FEFE | Pass 0 skeleton | |
| Lee Trevino's Fighting Golf (U) | 128 KB | 128 KB | Horizontal | $C079 / $C000 / $C0B7 | Pass 0 skeleton | |
| Legend of Zelda, The (U) (PRG 0) | 128 KB | none | Horizontal | $E484 / $FF50 / $FFF0 | Pass 0 skeleton | battery |
| Legend of Zelda, The (U) (PRG 1) | 128 KB | none | Horizontal | $E484 / $FF50 / $FFF0 | Pass 0 skeleton | battery |
| Legend of the Ghost Lion (U) | 128 KB | 128 KB | Horizontal | $FFEA / $FFED / $FFE9 | Pass 0 skeleton | battery |
| Lemmings (U) | 128 KB | 128 KB | Horizontal | $0100 / $FEA0 / $0103 | Pass 0 skeleton | |
| Lethal Weapon (U) | 128 KB | 128 KB | Horizontal | $FB46 / $FFF3 / $CA48 | Pass 0 skeleton | |
| Little League Baseball - Championship Series (U) | 128 KB | 128 KB | Horizontal | $CD85 / $CBD5 / $CDF4 | Pass 0 skeleton | |
| M.U.L.E. (U) | 128 KB | none | Vertical | $CE50 / $CEB6 / $CE9D | Pass 0 skeleton | |
| Magic Darts (U) | 128 KB | 128 KB | Horizontal | $FFCB / $FF8A / $FFCE | Pass 0 skeleton | |
| Magic Johnson's Fast Break (U) | 128 KB | 128 KB | Horizontal | $07FD / $FF00 / $FF89 | Pass 0 skeleton | |
| Maniac Mansion (U) | 256 KB | none | Vertical | $E362 / $D799 / $FFFF | Pass 0 skeleton | |
| Mechanized Attack (U) | 64 KB | 128 KB | Horizontal | $CE2A / $C000 / $CF0C | Pass 0 skeleton | |
| Mega Man 2 (U) | 256 KB | none | Vertical | $CFF0 / $FFE0 / $FFE0 | Pass 0 skeleton | |
| Metal Mech (U) | 128 KB | 128 KB | Horizontal | $D786 / $D352 / $D7AD | Pass 0 skeleton | |
| Metroid (U) | 128 KB | none | Vertical | $C0D9 / $FFB0 / $FFB0 | Pass 0 skeleton | |
| Miracle Piano Teaching System, The (U) | 256 KB | 64 KB | Horizontal | $C003 / $C000 / $C006 | Pass 0 skeleton | |
| Monopoly (U) | 128 KB | 128 KB | Horizontal | $C005 / $FF70 / $C000 | Pass 0 skeleton | |
| Motor City Patrol (U) | 128 KB | 128 KB | Horizontal | $FF21 / $FFAD / $FFAD | Pass 0 skeleton | |
| Mutant Virus, The (U) | 128 KB | 128 KB | Horizontal | $C16B / $C000 / $C16A | Pass 0 skeleton | |
| NES Open Tournament Golf (U) | 256 KB | none | Horizontal | $D2BF / $FFF3 / $CD73 | Pass 0 skeleton | battery |
| NES Open Tournament Golf (U) [a1] | 256 KB | none | Horizontal | $D2BF / $FFF3 / $CD73 | Pass 0 skeleton | battery |
| Nigel Mansell's World Championship Challenge (U) | 128 KB | 128 KB | Horizontal | $0104 / $C000 / $0314 | Pass 0 skeleton | |
| Ninja Gaiden (U) | 128 KB | 128 KB | Horizontal | $F91A / $FFDA / $FA1F | Pass 0 skeleton | |
| Ninja Gaiden (U) [a1] | 128 KB | 128 KB | Horizontal | $F91A / $FFDA / $FA1F | Pass 0 skeleton | |
| Ninja Gaiden (U) [a2] | 128 KB | 128 KB | Horizontal | $F91A / $FFDA / $FA1F | Pass 0 skeleton | 128-byte footer |
| Nobunaga's Ambition (U) | 256 KB | none | Horizontal | $C0DA / $C000 / $C139 | Pass 0 skeleton | battery |
| Operation Wolf (U) | 128 KB | 128 KB | Horizontal | $C0EA / $C010 / $C23C | Pass 0 skeleton | |
| Orb 3D (U) | 64 KB | 128 KB | Horizontal | $C003 / $C000 / $C006 | Pass 0 skeleton | |
| Overlord (U) | 256 KB | none | Horizontal | $C5F3 / $FFB0 / $FFDB | Pass 0 skeleton | |
| POW - Prisoners of War (U) | 128 KB | 128 KB | Horizontal | $C053 / $C000 / $C0CE | Pass 0 skeleton | |
| Palamedes (U) | 32 KB | 32 KB | Horizontal | $C055 / $BFD0 / $C0C1 | Pass 0 skeleton | |
| Phantom Fighter (U) | 256 KB | none | Horizontal | $C000 / $FFB0 / $0F00 | Pass 0 skeleton | |
| Pictionary (U) | 128 KB | 128 KB | Horizontal | $07FD / $FF00 / $C239 | Pass 0 skeleton | |
| Pinball Quest (U) | 128 KB | 128 KB | Horizontal | $C4B7 / $FFC0 / $C5D7 | Pass 0 skeleton | |
| Pinball Quest (U) [a1] | 128 KB | 128 KB | Horizontal | $C4B7 / $FFC0 / $C5D7 | Pass 0 skeleton | |
| Pirates! (U) | 128 KB | 128 KB | Horizontal | $F0F3 / $FFF1 / $FBFF | Pass 0 skeleton | battery |
| Platoon (U) (PRG 0) | 128 KB | 128 KB | Horizontal | $FC4B / $FFF3 / $FCBD | Pass 0 skeleton | |
| Platoon (U) (PRG 1) [!] | 128 KB | 128 KB | Vertical | $FC4B / $FFF3 / $FCBD | Pass 0 skeleton | |
| Predator (U) | 128 KB | 128 KB | Horizontal | $C643 / $C000 / $FEFE | Pass 0 skeleton | |
| Princess Tomato in Salad Kingdom (U) | 256 KB | none | Horizontal | $C05C / $C000 / $C0D5 | Pass 0 skeleton | |
| Qix (U) | 128 KB | none | Horizontal | $8003 / $FF90 / $8039 | Pass 0 skeleton | |
| RC Pro-Am (U) (PRG 1) | 32 KB | 32 KB | Vertical | $9AAB / $FFE9 / $FFF0 | Pass 0 skeleton | |
| Race America (U) | 128 KB | 128 KB | Horizontal | $CAC3 / $FFF1 / $CBB5 | Pass 0 skeleton | |
| Racket Attack (U) | 256 KB | 128 KB | Horizontal | $80AB / $FFB0 / $811C | Pass 0 skeleton | |
| Rad Racer (U) | 128 KB | none | Horizontal | $FF38 / $FE89 / $FF5E | Pass 0 skeleton | |
| Remote Control (U) | 128 KB | 128 KB | Horizontal | $FD64 / $FF00 / $EC22 | Pass 0 skeleton | |
| Rescue - The Embassy Mission (U) | 128 KB | 128 KB | Horizontal | $EBFE / $EB00 / $F5FE | Pass 0 skeleton | |
| Robin Hood - Prince of Thieves (U) | 256 KB | none | Horizontal | $C02F / $BFB0 / $FFDB | Pass 0 skeleton | |
| Robocop 2 (U) | 128 KB | 128 KB | Horizontal | $FE51 / $FF64 / $FE7F | Pass 0 skeleton | |
| Robocop 3 (U) | 128 KB | 128 KB | Horizontal | $C466 / $FF00 / $C464 | Pass 0 skeleton | |
| Rocket Ranger (U) [!] | 256 KB | none | Horizontal | $D71E / $C000 / $FFF9 | Pass 0 skeleton | |
| Rocketeer, The (U) | 256 KB | none | Vertical | $C000 / $FFA2 / $FFA2 | Pass 0 skeleton | |
| Rollerball (U) | 128 KB | 32 KB | Horizontal | $C073 / $C000 / $C05E | Pass 0 skeleton | |
| Romance of the Three Kingdoms (U) | 256 KB | none | Horizontal | $C0D5 / $C000 / $C13F | Pass 0 skeleton | battery |
| SCAT - Special Cybernetic Attack Team (U) | 128 KB | 128 KB | Horizontal | $C05E / $BFD0 / $C0E2 | Pass 0 skeleton | |
| Sesame Street 123 (U) | 32 KB | 32 KB | Horizontal | $FF40 / $CCFA / $FFB2 | Pass 0 skeleton | |
| Sesame Street ABC (U) | 32 KB | 32 KB | Horizontal | $94C6 / $EC53 / $9372 | Pass 0 skeleton | |
| Sesame Street ABC - 123 (U) | 128 KB | 128 KB | Horizontal | $C45F / $FFEE / $C45E | Pass 0 skeleton | |
| Sesame Street Countdown (U) | 128 KB | 128 KB | Horizontal | $CDF9 / $D1CD / $C9DD | Pass 0 skeleton | |
| Shingen The Ruler (U) | 256 KB | none | Horizontal | $FEF8 / $FFD9 / $FEA0 | Pass 0 skeleton | |
| Shingen The Ruler (U) [a1] | 256 KB | none | Horizontal | $FEF8 / $FFD9 / $FEA0 | Pass 0 skeleton | |
| Short Order - Eggsplode (U) | 32 KB | 32 KB | Horizontal | $C4AF / $FFB0 / $C4EE | Pass 0 skeleton | |
| Silk Worm (U) | 128 KB | 128 KB | Vertical | $C103 / $FF80 / $C106 | Pass 0 skeleton | |
| Simpsons - Bart Vs the Space Mutants, The (U) | 128 KB | 128 KB | Vertical | $CEDE / $C000 / $CF29 | Pass 0 skeleton | |
| Skate or Die 2 - The Search for Double Trouble (U) | 256 KB | 128 KB | Horizontal | $CADD / $C4B3 / $D02A | Pass 0 skeleton | |
| Sky Kid (U) | 32 KB | 64 KB | Horizontal | $F429 / $F212 / $F212 | Pass 0 skeleton | |
| Sky Shark (U) | 64 KB | 128 KB | Horizontal | $07FD / $FF00 / $FF9E | Pass 0 skeleton | |
| Snake Rattle'n Roll (U) | 32 KB | 32 KB | Horizontal | $FF81 / $FFF1 / $FF80 | Pass 0 skeleton | |
| Snake's Revenge (U) | 128 KB | 128 KB | Horizontal | $C093 / $FFF2 / $C0F1 | Pass 0 skeleton | |
| Snoopy's Silly Sports Spectacular (U) | 128 KB | 128 KB | Horizontal | $E8E9 / $E800 / $F219 | Pass 0 skeleton | |
| Snow Bros (U) | 128 KB | 128 KB | Horizontal | $C246 / $FFD8 / $C0C0 | Pass 0 skeleton | |
| Space Shuttle Project (U) | 256 KB | none | Horizontal | $C003 / $FFF1 / $C006 | Pass 0 skeleton | |
| Spot (U) | 128 KB | none | Horizontal | $D468 / $C000 / $D466 | Pass 0 skeleton | |
| Stealth ATF (U) | 128 KB | 128 KB | Horizontal | $801A / $8000 / $D1E5 | Pass 0 skeleton | |
| Street Cop (U) | 128 KB | 128 KB | Horizontal | $F942 / $FFD3 / $FFF0 | Pass 0 skeleton | |
| Strider (U) | 256 KB | none | Horizontal | $C0ED / $BFE0 / $C12B | Pass 0 skeleton | |
| Super Dodge Ball (U) | 128 KB | 128 KB | Horizontal | $FF3A / $FFE8 / $EF9E | Pass 0 skeleton | |
| Super Jeopardy! (U) | 128 KB | 128 KB | Horizontal | $C4A2 / $FFF0 / $FFF0 | Pass 0 skeleton | |
| Super Mario Bros - Duck Hunt - Track Meet (U) | 128 KB | 64 KB | Horizontal | $E001 / $E037 / $E000 | Pass 0 skeleton | |
| Superman (U) | 128 KB | 128 KB | Horizontal | $E8E3 / $FFED / $EE40 | Pass 0 skeleton | |
| Swamp Thing (U) [!] | 128 KB | 128 KB | Horizontal | $C109 / $FFF1 / $C15C | Pass 0 skeleton | |
| Taboo - The Sixth Sense (U) | 32 KB | 32 KB | Horizontal | $8059 / $8000 / $FF69 | Pass 0 skeleton | |
| TaleSpin (U) | 128 KB | 128 KB | Horizontal | $C000 / $FFE0 / $FFE0 | Pass 0 skeleton | |
| Target Renegade (U) | 128 KB | 128 KB | Horizontal | $07FD / $FF00 / $FFA6 | Pass 0 skeleton | |
| Tecmo Baseball (U) | 128 KB | none | Horizontal | $C103 / $FF00 / $C106 | Pass 0 skeleton | |
| Tecmo Bowl (U) (PRG 0) | 128 KB | 128 KB | Horizontal | $C060 / $C000 / $C3A0 | Pass 0 skeleton | |
| Tecmo Bowl (U) (PRG 1) | 128 KB | 128 KB | Vertical | $C060 / $FFE0 / $C060 | Pass 0 skeleton | |
| Tecmo Bowl (U) (Prototype) | 128 KB | 128 KB | Horizontal | $C060 / $C000 / $C2A0 | Pass 0 skeleton | |
| Tecmo Cup - Soccer Game (U) | 128 KB | 128 KB | Horizontal | $8002 / $FFC0 / $8002 | Pass 0 skeleton | |
| Tecmo Cup - Soccer Game (U) [a1] | 128 KB | 128 KB | Horizontal | $8002 / $FFC0 / $8002 | Pass 0 skeleton | |
| Tecmo World Wrestling (U) | 128 KB | 128 KB | Vertical | $BF00 / $FFE0 / $BF00 | Pass 0 skeleton | |
| Teenage Mutant Ninja Turtles (U) | 128 KB | 128 KB | Horizontal | $C3A3 / $FFD8 / $C412 | Pass 0 skeleton | |
| Tetris (U) [!] | 32 KB | 16 KB | Vertical | $8005 / $FF00 / $804A | Pass 0 skeleton | |
| Three Stooges (U) | 128 KB | 128 KB | Horizontal | $E859 / $E45F / $E8DA | Pass 0 skeleton | |
| Three Stooges (U) (Prototype) | 128 KB | 128 KB | Vertical | $E925 / $E540 / $E9A6 | Pass 0 skeleton | |
| Thunderbirds (U) | 128 KB | 128 KB | Horizontal | $C7A9 / $C600 / $C85B | Pass 0 skeleton | |
| Tombs and Treasure (U) | 256 KB | none | Horizontal | $C003 / $C000 / $C006 | Pass 0 skeleton | |
| Touch Down Fever (U) | 128 KB | 32 KB | Horizontal | $C047 / $C000 / $C044 | Pass 0 skeleton | |
| Track & Field 2 (U) | 128 KB | 128 KB | Horizontal | $C047 / $C001 / $C121 | Pass 0 skeleton | |
| Treasure Master (U) | 128 KB | 128 KB | Horizontal | $07FD / $FF0C / $FF8F | Pass 0 skeleton | |
| Ultima - Exodus (U) | 256 KB | none | Vertical | $EA30 / $FFA0 / $ED32 | Pass 0 skeleton | battery |
| Ultima - Quest of the Avatar (U) | 256 KB | none | Horizontal | $F1A1 / $FFDA / $FFDA | Pass 0 skeleton | battery |
| Ultima - Warriors of Destiny (U) | 256 KB | none | Horizontal | $CE4B / $C000 / $FC1C | Pass 0 skeleton | |
| Untouchables, The (U) | 128 KB | 128 KB | Horizontal | $0108 / $FF50 / $0314 | Pass 0 skeleton | |
| Vegas Dream (U) | 128 KB | 128 KB | Horizontal | $C401 / $FF00 / $C4B4 | Pass 0 skeleton | |
| Win, Lose or Draw (U) | 128 KB | none | Horizontal | $EC40 / $FF00 / $EDA7 | Pass 0 skeleton | |
| Wizardry - Proving Grounds of the Mad Overlord (U) | 128 KB | 128 KB | Vertical | $C069 / $C003 / $C1C9 | Pass 0 skeleton | battery |
| Wrath of the Black Manta (U) | 128 KB | 128 KB | Horizontal | $817E / $FFD8 / $FFD5 | Pass 0 skeleton | |
| Wrecking Crew (JUE) | 32 KB | 8 KB | Horizontal | $9BB7 / $9ACD / $9ACD | Pass 0 skeleton | |
| Xenophobe (U) | 128 KB | 32 KB | Horizontal | $C0E8 / $FFF3 / $FFF3 | Pass 0 skeleton | |
| Xexyz (U) | 128 KB | 128 KB | Horizontal | $815A / $FFD0 / $FFD8 | Pass 0 skeleton | |
| Yo! Noid (U) | 128 KB | 128 KB | Horizontal | $C33B / $FFD1 / $C413 | Pass 0 skeleton | |
| Yoshi (U) | 128 KB | 128 KB | Horizontal | $E122 / $FFDA / $E1ED | Pass 0 skeleton | |
| Zelda 2 - The Adventure of Link (U) | 128 KB | 128 KB | Horizontal | $C07B / $FF70 / $FFF0 | Pass 0 skeleton | battery |
_wip/MMC3/ — mapper 4 (239 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| 8 Eyes (U) | 128 KB | 128 KB | Horizontal | $FA00 / $FF00 / $FE09 | Pass 0 skeleton | |
| AD&D Dragon Strike (U) | 256 KB | 256 KB | Vertical | $FE05 / $FE98 / $FE98 | Pass 0 skeleton | |
| AD&D Dragon Strike (U) [a1] | 256 KB | 256 KB | Horizontal | $FE05 / $FE98 / $FE98 | Pass 0 skeleton | |
| AD&D Pool of Radiance (U) | 512 KB | 128 KB | Vertical | $F5EE / $F5AC / $D85E | Pass 0 skeleton | battery |
| Adventures of Lolo 2 (U) | 32 KB | 32 KB | Horizontal | $D317 / $FFEF / $D38D | Pass 0 skeleton | |
| Adventures of Rocky and Bullwinkle and Friends, The (U) | 128 KB | 128 KB | Vertical | $C000 / $FE00 / $C15D | Pass 0 skeleton | |
| Alien 3 (U) | 128 KB | 128 KB | Horizontal | $FE82 / $E000 / $FE7F | Pass 0 skeleton | |
| Alien Syndrome (U) | 128 KB | 128 KB | Vertical | $F682 / $FB07 / $FB07 | Pass 0 skeleton | |
| Astyanax (U) | 128 KB | 128 KB | Horizontal | $E0D0 / $E000 / $E1C3 | Pass 0 skeleton | |
| Astyanax (U) (Prototype) | 128 KB | 128 KB | Vertical | $E0BD / $E000 / $E1A8 | Pass 0 skeleton | |
| Bad Dudes (U) | 128 KB | 128 KB | Horizontal | $CA73 / $FF30 / $D015 | Pass 0 skeleton | |
| Base Wars (U) | 128 KB | 128 KB | Horizontal | $F95E / $F830 / $FABA | Pass 0 skeleton | |
| Base Wars (U) [a1] | 128 KB | 128 KB | Horizontal | $F95E / $F830 / $FABA | Pass 0 skeleton | |
| Baseball Stars 2 (U) | 256 KB | 128 KB | Horizontal | $F71B / $F2DE / $F7B7 | Pass 0 skeleton | |
| Bases Loaded 3 (U) | 256 KB | 128 KB | Horizontal | $E921 / $FF15 / $E9FE | Pass 0 skeleton | |
| Bases Loaded 4 (U) | 256 KB | 128 KB | Horizontal | $C131 / $FD4E / $C227 | Pass 0 skeleton | |
| Batman (U) | 128 KB | 128 KB | Horizontal | $ED2A / $FFF6 / $EE9A | Pass 0 skeleton | |
| Batman (U) (Prototype) | 128 KB | 128 KB | Vertical | $ECE7 / $FFF6 / $EE57 | Pass 0 skeleton | |
| Batman Returns (U) | 128 KB | 256 KB | Horizontal | $FC75 / $FBCC / $CF29 | Pass 0 skeleton | |
| Bill Elliott's NASCAR Challenge (U) | 128 KB | 256 KB | Horizontal | $E1AE / $E000 / $E3B4 | Pass 0 skeleton | |
| Blue Marlin, The (U) | 128 KB | 128 KB | Horizontal | $E124 / $E000 / $E1B4 | Pass 0 skeleton | |
| Bo Jackson Baseball (U) | 128 KB | 256 KB | Vertical | $E353 / $E000 / $E096 | Pass 0 skeleton | |
| Bonk's Adventure (U) | 256 KB | 128 KB | Horizontal | $C19A / $FFC0 / $C281 | Pass 0 skeleton | |
| Bram Stoker's Dracula (U) | 128 KB | 128 KB | Vertical | $FFF4 / $E000 / $FFF7 | Pass 0 skeleton | |
| Bubble Bobble Part 2 (U) | 128 KB | 128 KB | Horizontal | $E148 / $E000 / $E132 | Pass 0 skeleton | |
| Bucky O'Hare (U) [!] | 128 KB | 128 KB | Vertical | $FB86 / $FB3B / $D32C | Pass 0 skeleton | |
| Bugs Bunny Birthday Bash (Prototype) (U) | 128 KB | 128 KB | Horizontal | $ECC7 / $E800 / $EB49 | Pass 0 skeleton | |
| Bugs Bunny Birthday Blowout, The (U) | 128 KB | 128 KB | Horizontal | $ED9F / $E8C0 / $EC21 | Pass 0 skeleton | |
| Burai Fighter (U) | 32 KB | 32 KB | Horizontal | $F998 / $F8D7 / $FC90 | Pass 0 skeleton | |
| Captain America and the Avengers (U) | 128 KB | 128 KB | Horizontal | $E1DE / $E000 / $D79B | Pass 0 skeleton | |
| Captain Planet and the Planeteers (U) | 128 KB | 128 KB | Horizontal | $F7EE / $F9B2 / $F90B | Pass 0 skeleton | |
| Cliffhanger (U) | 128 KB | 128 KB | Vertical | $C000 / $FF97 / $C14A | Pass 0 skeleton | |
| Code Name Viper (U) | 128 KB | 128 KB | Horizontal | $FA68 / $FE00 / $E32B | Pass 0 skeleton | |
| Conquest of the Crystal Palace (U) | 128 KB | 128 KB | Horizontal | $F89D / $F7E8 / $F750 | Pass 0 skeleton | |
| Contra Force (U) | 128 KB | 128 KB | Vertical | $FD6B / $FD2B / $F728 | Pass 0 skeleton | |
| Cowboy Kid (U) | 256 KB | 256 KB | Horizontal | $C009 / $FFB0 / $C006 | Pass 0 skeleton | |
| Crash'n The Boys Street Challenge (U) | 128 KB | 128 KB | Horizontal | $FFF1 / $FFF4 / $FFF7 | Pass 0 skeleton | |
| Crystalis (Prototype) (U) | 256 KB | 128 KB | Horizontal | $F3B3 / $F2A3 / $F43C | Pass 0 skeleton | battery |
| Crystalis (Prototype) (U) [a1] | 256 KB | 128 KB | Horizontal | $F3B3 / $F2A3 / $F43C | Pass 0 skeleton | battery |
| Crystalis (U) | 256 KB | 128 KB | Horizontal | $F3B6 / $F2A4 / $F443 | Pass 0 skeleton | battery |
| Crystalis (U) [a1] | 256 KB | 128 KB | Horizontal | $F3B6 / $F2A4 / $F443 | Pass 0 skeleton | 127-byte footer; battery |
| Cyberball (U) | 128 KB | 128 KB | Horizontal | $F3BF / $E000 / $F5AE | Pass 0 skeleton | |
| Days of Thunder (U) | 128 KB | 256 KB | Vertical | $8059 / $FDF5 / $805C | Pass 0 skeleton | |
| Defenders of Dynatron City (U) | 128 KB | 128 KB | Horizontal | $C08E / $FFF2 / $FE80 | Pass 0 skeleton | |
| Deja Vu (U) | 128 KB | 256 KB | Horizontal | $EC9A / $E800 / $EB40 | Pass 0 skeleton | |
| Dirty Harry (U) | 256 KB | 128 KB | Horizontal | $F5BC / $F68F / $F68E | Pass 0 skeleton | |
| Double Dragon 2 - The Revenge (U) | 128 KB | 128 KB | Horizontal | $FF50 / $FF75 / $EC34 | Pass 0 skeleton | |
| Double Dragon 3 - The Sacred Stones (U) | 128 KB | 128 KB | Horizontal | $FF5F / $FF84 / $E173 | Pass 0 skeleton | |
| Dragon Spirit - The New Legend (U) | 128 KB | 128 KB | Horizontal | $CE2C / $FFD1 / $FFD1 | Pass 0 skeleton | |
| Earth Bound (Prototype) (U) | 256 KB | 256 KB | Vertical | $F79F / $FF40 / $FE13 | Pass 0 skeleton | battery |
| Earth Bound Zero (Neo Demiforce v1.01 Hack-1) (U) | 256 KB | 256 KB | Vertical | $F79F / $FF40 / $FE13 | Pass 0 skeleton | battery |
| Earth Bound Zero (Neo Demiforce v1.01 Hack-2) (U) | 256 KB | 256 KB | Vertical | $F79F / $FF40 / $FE13 | Pass 0 skeleton | battery |
| F-117a Stealth Fighter (U) [!] | 256 KB | 256 KB | Vertical | $E24E / $E000 / $E320 | Pass 0 skeleton | battery |
| F-15 Strike Eagle (U) | 256 KB | 256 KB | Horizontal | $F130 / $F97C / $F12F | Pass 0 skeleton | |
| Fantasy Zone (U) | 64 KB | 64 KB | Horizontal | $C006 / $FFB0 / $C003 | Pass 0 skeleton | |
| Felix the Cat (U) | 128 KB | 128 KB | Vertical | $C0C0 / $FFD0 / $C189 | Pass 0 skeleton | |
| Fire 'n Ice (U) | 128 KB | 128 KB | Vertical | $E003 / $E000 / $E006 | Pass 0 skeleton | |
| Flintstones - The Rescue of Dino & Hoppy, The (U) | 128 KB | 256 KB | Horizontal | $F944 / $F752 / $01FD | Pass 0 skeleton | |
| Flintstones 2 - The Surprise at Dinosaur Peak!, The (U) | 128 KB | 256 KB | Horizontal | $F9D0 / $F7C1 / $01FD | Pass 0 skeleton | |
| GI Joe (U) | 128 KB | 256 KB | Horizontal | $EF46 / $EED2 / $F34C | Pass 0 skeleton | |
| GI Joe - The Atlantis Factor (U) | 128 KB | 256 KB | Horizontal | $F3C1 / $F336 / $F9CF | Pass 0 skeleton | |
| Galaxy 5000 (U) | 128 KB | 128 KB | Horizontal | $FE96 / $F400 / $FF8F | Pass 0 skeleton | |
| Gargoyle's Quest 2 - The Demon Darkness (U) | 128 KB | 128 KB | Horizontal | $C000 / $FDD0 / $C144 | Pass 0 skeleton | |
| Gauntlet (U) | 128 KB | 64 KB | Vertical | $C16A / $FF90 / $FF90 | Pass 0 skeleton | four-screen flag |
| Gauntlet 2 (U) | 128 KB | 128 KB | Vertical | $F65F / $F6C2 / $F69D | Pass 0 skeleton | four-screen flag |
| George Foreman's KO Boxing (U) | 128 KB | 256 KB | Horizontal | $E24A / $E336 / $E222 | Pass 0 skeleton | |
| Gold Medal Challenge '92 (U) | 128 KB | 128 KB | Horizontal | $C0F8 / $FFD8 / $C20F | Pass 0 skeleton | |
| Gremlins 2 - The New Batch (U) | 128 KB | 256 KB | Horizontal | $E2DD / $E3C6 / $E36A | Pass 0 skeleton | |
| Gun Nac (U) | 128 KB | 128 KB | Vertical | $EF85 / $E000 / $F20B | Pass 0 skeleton | |
| Heavy Barrel (U) | 128 KB | 128 KB | Horizontal | $E178 / $E000 / $E4C9 | Pass 0 skeleton | |
| Home Alone (U) [!] | 128 KB | 128 KB | Horizontal | $E3D6 / $E000 / $E4D1 | Pass 0 skeleton | |
| Home Alone 2 - Lost in New York (U) | 128 KB | 128 KB | Horizontal | $C121 / $FFDB / $C18F | Pass 0 skeleton | |
| Hudson's Adventure Island 2 (U) | 128 KB | 128 KB | Horizontal | $E0CE / $FFAE / $E152 | Pass 0 skeleton | |
| Hudson's Adventure Island 3 (U) | 128 KB | 128 KB | Horizontal | $E0E3 / $FFAE / $E17F | Pass 0 skeleton | |
| Hunt for Red October, The (U) | 128 KB | 128 KB | Horizontal | $EB8C / $EAFF / $EDF2 | Pass 0 skeleton | |
| Image Fight (U) | 128 KB | 128 KB | Horizontal | $FDE0 / $FF90 / $FF81 | Pass 0 skeleton | |
| Immortal, The (U) | 128 KB | 256 KB | Horizontal | $F84D / $F6D6 / $F750 | Pass 0 skeleton | |
| Incredible Crash Dummies, The (U) | 128 KB | 256 KB | Horizontal | $07FD / $E102 / $07FA | Pass 0 skeleton | |
| Indiana Jones and the Temple of Doom (Tengen) (U) | 128 KB | 64 KB | Horizontal | $EC56 / $EBA4 / $0000 | Pass 0 skeleton | |
| Indiana Jones and the Temple of Doom (U) | 128 KB | 64 KB | Horizontal | $EC56 / $EBA4 / $0000 | Pass 0 skeleton | |
| Infiltrator (U) | 128 KB | 64 KB | Horizontal | $F6A5 / $F70D / $F6F6 | Pass 0 skeleton | |
| Isolated Warrior (U) | 128 KB | 128 KB | Horizontal | $F592 / $F432 / $F94F | Pass 0 skeleton | |
| Jackie Chan's Action Kung Fu (U) | 128 KB | 128 KB | Horizontal | $E0A8 / $FFDD / $E1DA | Pass 0 skeleton | |
| James Bond Jr (U) | 128 KB | 128 KB | Vertical | $C432 / $FD61 / $C424 | Pass 0 skeleton | |
| Jetsons - Cogswell's Caper!, The (U) | 128 KB | 256 KB | Vertical | $C003 / $FFF0 / $C006 | Pass 0 skeleton | |
| Joe & Mac (U) | 128 KB | 128 KB | Vertical | $FD5D / $FFD6 / $F649 | Pass 0 skeleton | |
| Jungle Book, The (U) | 128 KB | 128 KB | Horizontal | $EEF3 / $EFF5 / $EEE5 | Pass 0 skeleton | |
| Jurassic Park (U) | 128 KB | 128 KB | Horizontal | $CBAD / $E4FE / $CED3 | Pass 0 skeleton | |
| Kabuki - Quantum Fighter (U) | 128 KB | 128 KB | Vertical | $F8B1 / $F747 / $01FD | Pass 0 skeleton | |
| Karnov (U) | 128 KB | 64 KB | Horizontal | $C1DB / $C000 / $C200 | Pass 0 skeleton | |
| Kick Master (U) | 128 KB | 128 KB | Vertical | $F0BB / $F010 / $F7B1 | Pass 0 skeleton | |
| Kickle Cubicle (U) | 128 KB | 128 KB | Vertical | $C190 / $FFD0 / $FFD0 | Pass 0 skeleton | |
| Kid Klown (U) | 128 KB | 128 KB | Horizontal | $F39C / $E8C0 / $F64E | Pass 0 skeleton | |
| King's Quest V (U) | 256 KB | 256 KB | Vertical | $07F9 / $FFC0 / $07FD | Pass 0 skeleton | four-screen flag; battery |
| Kirby's Adventure (U) (PRG 0) | 512 KB | 256 KB | Horizontal | $C341 / $FFF0 / $0029 | Pass 0 skeleton | battery |
| Kirby's Adventure (U) (PRG 1) [!] | 512 KB | 256 KB | Horizontal | $C341 / $FFF0 / $0029 | Pass 0 skeleton | battery |
| Kiwi Kraze (U) | 128 KB | 128 KB | Horizontal | $07FD / $FF00 / $07FA | Pass 0 skeleton | |
| Krion Conquest, The (U) | 128 KB | 128 KB | Horizontal | $E11B / $E100 / $E180 | Pass 0 skeleton | |
| Krion Conquest, The (U) [a1] | 128 KB | 128 KB | Horizontal | $E11B / $E100 / $E180 | Pass 0 skeleton | |
| Krusty's Fun House (U) | 256 KB | 128 KB | Horizontal | $E2CD / $F995 / $E2A0 | Pass 0 skeleton | |
| Last Action Hero (U) [!] | 128 KB | 128 KB | Vertical | $FB84 / $E000 / $F7C3 | Pass 0 skeleton | |
| Last Ninja, The (U) | 128 KB | 128 KB | Horizontal | $E000 / $E141 / $8000 | Pass 0 skeleton | |
| Legacy of the Wizard (U) | 128 KB | 64 KB | Horizontal | $D1FE / $FFE0 / $D1FE | Pass 0 skeleton | |
| Legends of the Diamond (U) | 128 KB | 256 KB | Horizontal | $E002 / $E100 / $E005 | Pass 0 skeleton | |
| Little Nemo - The Dream Master (U) | 128 KB | 128 KB | Horizontal | $F4D9 / $F444 / $F9D2 | Pass 0 skeleton | |
| Little Ninja Brothers (U) | 128 KB | 128 KB | Horizontal | $ED87 / $E307 / $EC95 | Pass 0 skeleton | |
| Little Samson (U) | 256 KB | 128 KB | Vertical | $E0BE / $E000 / $E1A8 | Pass 0 skeleton | |
| Lone Ranger, The (U) | 256 KB | 128 KB | Horizontal | $F1AF / $F151 / $00E3 | Pass 0 skeleton | |
| Low G Man (U) | 128 KB | 128 KB | Vertical | $F4B1 / $F400 / $F949 | Pass 0 skeleton | |
| MC Kids (U) | 128 KB | 128 KB | Horizontal | $C66C / $FF80 / $C61C | Pass 0 skeleton | |
| Mad Max (U) [!] | 128 KB | 128 KB | Horizontal | $F200 / $F26A / $F253 | Pass 0 skeleton | |
| Mafat Conspiracy - Golgo 13 (U) | 128 KB | 128 KB | Horizontal | $E5E1 / $E040 / $E3F8 | Pass 0 skeleton | |
| Magician (U) | 128 KB | 128 KB | Horizontal | $F9AB / $F9C1 / $F9B3 | Pass 0 skeleton | |
| Magician (U) (Prototype) | 128 KB | 128 KB | Vertical | $F96E / $F984 / $F976 | Pass 0 skeleton | battery |
| Mappy-Land (U) | 128 KB | 32 KB | Horizontal | $062D / $FFC0 / $F064 | Pass 0 skeleton | |
| Mario is Missing! (U) | 128 KB | 128 KB | Horizontal | $C002 / $FA94 / $C380 | Pass 0 skeleton | |
| Mario's Time Machine! (U) | 128 KB | 128 KB | Vertical | $F749 / $FAE4 / $F489 | Pass 0 skeleton | |
| Mario's Time Machine! (U) [a1] | 128 KB | 128 KB | Horizontal | $F749 / $FAE4 / $F489 | Pass 0 skeleton | |
| Mega Man 3 (Prototype) (U) [!] | 256 KB | 128 KB | Vertical | $C000 / $FE00 / $C143 | Pass 0 skeleton | |
| Mega Man 3 (U) [!] | 256 KB | 128 KB | Horizontal | $C000 / $FE00 / $C143 | Pass 0 skeleton | |
| Mega Man 4 (U) | 512 KB | none | Horizontal | $C000 / $FE00 / $C149 | Pass 0 skeleton | |
| Mega Man 5 (U) | 256 KB | 256 KB | Horizontal | $C000 / $FE00 / $C169 | Pass 0 skeleton | |
| Mega Man 6 (U) | 512 KB | none | Horizontal | $C000 / $FF70 / $C14C | Pass 0 skeleton | |
| Mendel Palace (U) | 128 KB | 128 KB | Vertical | $C000 / $FF16 / $C068 | Pass 0 skeleton | |
| Metal Storm (U) | 128 KB | 256 KB | Horizontal | $FCBF / $FC00 / $FC00 | Pass 0 skeleton | |
| Michael Andretti's World Grand Prix (U) | 128 KB | 128 KB | Vertical | $FB12 / $F9C6 / $01FD | Pass 0 skeleton | |
| Mickey's Adventures in Numberland (U) | 128 KB | 128 KB | Vertical | $E091 / $E000 / $E08E | Pass 0 skeleton | |
| Mickey's Safari in Letterland (U) | 128 KB | 128 KB | Vertical | $E087 / $E000 / $E084 | Pass 0 skeleton | |
| Might and Magic (U) | 256 KB | 256 KB | Horizontal | $FFEF / $FF70 / $DB8D | Pass 0 skeleton | battery |
| Mighty Final Fight (U) | 128 KB | 128 KB | Horizontal | $C000 / $FE00 / $C13B | Pass 0 skeleton | |
| Mission Impossible (U) | 128 KB | 128 KB | Horizontal | $FE91 / $FE39 / $03E0 | Pass 0 skeleton | |
| Monster in My Pocket (U) | 128 KB | 128 KB | Horizontal | $FD1F / $FC3D / $D843 | Pass 0 skeleton | |
| NES Play Action Football (U) | 128 KB | 128 KB | Horizontal | $EF17 / $E250 / $8014 | Pass 0 skeleton | |
| Nightshade (U) | 256 KB | 256 KB | Horizontal | $E446 / $E471 / $E443 | Pass 0 skeleton | |
| Nightshade (U) [a1] | 256 KB | 256 KB | Horizontal | $E446 / $E471 / $E443 | Pass 0 skeleton | |
| Ninja Crusaders (U) | 128 KB | none | Vertical | $FD9E / $FEDC / $FEB6 | Pass 0 skeleton | |
| Ninja Gaiden 2 - The Dark Sword of Chaos (U) | 128 KB | 128 KB | Horizontal | $D4F3 / $FB62 / $D277 | Pass 0 skeleton | |
| Ninja Gaiden 2 - The Dark Sword of Chaos (U) (Prototype) | 128 KB | 128 KB | Vertical | $D4F3 / $FB62 / $D277 | Pass 0 skeleton | battery |
| Ninja Gaiden 3 - The Ancient Ship of Doom (U) | 128 KB | 128 KB | Horizontal | $C68F / $FFE0 / $C7B0 | Pass 0 skeleton | |
| Nintendo World Cup (U) | 128 KB | 128 KB | Horizontal | $FF5B / $FF82 / $E3AF | Pass 0 skeleton | |
| North & South (U) | 128 KB | 128 KB | Horizontal | $ECC4 / $E800 / $EB8C | Pass 0 skeleton | |
| Pacmania (U) | 64 KB | 32 KB | Horizontal | $EC10 / $ECC2 / $ECC2 | Pass 0 skeleton | |
| Panic Restaurant (U) | 128 KB | 128 KB | Horizontal | $FA53 / $FF70 / $F204 | Pass 0 skeleton | |
| Power Blade (U) [!] | 128 KB | 128 KB | Vertical | $F35A / $F186 / $F20A | Pass 0 skeleton | |
| Power Blade 2 (U) | 128 KB | 128 KB | Vertical | $E9C7 / $E5B9 / $E640 | Pass 0 skeleton | |
| Power Punch 2 (U) | 128 KB | 256 KB | Horizontal | $E0E0 / $E000 / $E0EB | Pass 0 skeleton | |
| Punisher, The (U) | 128 KB | 128 KB | Horizontal | $E6E6 / $E54A / $E712 | Pass 0 skeleton | |
| RBI Baseball (U) | 64 KB | 32 KB | Vertical | $F05B / $F000 / $F000 | Pass 0 skeleton | |
| RBI Baseball 2 (U) | 128 KB | 64 KB | Vertical | $F5C9 / $F538 / $F538 | Pass 0 skeleton | |
| RBI Baseball 3 (U) | 128 KB | 64 KB | Vertical | $F656 / $F5B4 / $F5B4 | Pass 0 skeleton | |
| Rad Racer 2 (U) [!] | 64 KB | 64 KB | Horizontal | $F68C / $F2A9 / $C147 | Pass 0 skeleton | |
| Rampage (U) | 128 KB | 64 KB | Horizontal | $DA41 / $FC99 / $DAC6 | Pass 0 skeleton | |
| Rampart (U) | 128 KB | 128 KB | Vertical | $FB3C / $FEE7 / $F36D | Pass 0 skeleton | |
| Ren & Stimpy Show, The (U) | 128 KB | 128 KB | Horizontal | $C128 / $FFDB / $C1B3 | Pass 0 skeleton | |
| Ring King (U) | 64 KB | 64 KB | Vertical | $C0C4 / $FFDA / $FFDA | Pass 0 skeleton | |
| River City Ransom (U) | 128 KB | 128 KB | Horizontal | $FF4F / $FF76 / $F1D9 | Pass 0 skeleton | |
| Road Runner (U) | 64 KB | 128 KB | Vertical | $FE40 / $E000 / $FEBD | Pass 0 skeleton | |
| Robocop (U) | 128 KB | 128 KB | Horizontal | $C195 / $FF00 / $C1BE | Pass 0 skeleton | |
| Robocop Vs The Terminator (Prototype) (U) | 128 KB | 128 KB | Vertical | $C680 / $FF80 / $C630 | Pass 0 skeleton | |
| Robocop Vs The Terminator (Prototype) (U) [a1] | 128 KB | 128 KB | Vertical | $C680 / $FF80 / $C630 | Pass 0 skeleton | |
| Rock 'n' Ball (U) | 128 KB | 64 KB | Horizontal | $C1D1 / $F6BF / $C3B8 | Pass 0 skeleton | |
| Rockin' Kats (U) [!] | 128 KB | 128 KB | Vertical | $F885 / $F800 / $F50C | Pass 0 skeleton | |
| Roger Clemens MVP Baseball (U) | 128 KB | 256 KB | Vertical | $CF44 / $FFAD / $CF43 | Pass 0 skeleton | |
| Rollerblade Racer (U) | 128 KB | 128 KB | Vertical | $FD58 / $FB03 / $FCAE | Pass 0 skeleton | |
| Rollergames (U) [!] | 128 KB | 128 KB | Vertical | $F3E5 / $F32F / $F27C | Pass 0 skeleton | |
| Rolling Thunder (U) | 128 KB | 128 KB | Horizontal | $FA5E / $FE80 / $DED6 | Pass 0 skeleton | |
| Roundball - 2-on-2 Challenge (U) | 128 KB | 128 KB | Horizontal | $EAB0 / $E005 / $E73D | Pass 0 skeleton | |
| Shadow of the Ninja (U) | 128 KB | 128 KB | Vertical | $E12D / $E000 / $E3CD | Pass 0 skeleton | |
| Shatterhand (U) | 128 KB | 128 KB | Vertical | $F626 / $FDB6 / $FB78 | Pass 0 skeleton | |
| Silver Surfer (U) | 128 KB | 256 KB | Vertical | $07FD / $FF60 / $FD82 | Pass 0 skeleton | |
| Simpsons - Bart Vs the World, The (U) | 256 KB | 128 KB | Horizontal | $D0D7 / $FFDB / $D153 | Pass 0 skeleton | |
| Simpsons - Bartman Meets Radioactive Man, The (U) | 256 KB | 128 KB | Horizontal | $C11B / $FFDB / $C19D | Pass 0 skeleton | |
| Smash TV (U) [!] | 128 KB | 128 KB | Vertical | $E0F5 / $E000 / $E168 | Pass 0 skeleton | |
| Spider-Man - Return of the Sinister Six (U) [!] | 128 KB | 256 KB | Vertical | $C128 / $E240 / $C12B | Pass 0 skeleton | |
| Stanley - The Search for Dr Livingston (U) | 128 KB | 128 KB | Vertical | $C81A / $FFA6 / $C819 | Pass 0 skeleton | |
| Star Trek - 25th Anniversary (U) | 256 KB | 256 KB | Horizontal | $C00F / $FF72 / $C367 | Pass 0 skeleton | |
| Star Wars (U) | 128 KB | 128 KB | Horizontal | $E003 / $E7B0 / $E000 | Pass 0 skeleton | |
| Star Wars - The Empire Strikes Back (U) | 256 KB | 256 KB | Horizontal | $FBD7 / $FB22 / $FB60 | Pass 0 skeleton | |
| Startropics 2 - Zoda's Revenge (U) | 256 KB | 256 KB | Horizontal | $FFAD / $FFA0 / $FFB5 | Pass 0 skeleton | |
| Startropics 2 - Zoda's Revenge (U) [a1] | 256 KB | 256 KB | Horizontal | $FFAD / $FFA0 / $FFB5 | Pass 0 skeleton | |
| Street Fighter 2010 (U) | 128 KB | 128 KB | Horizontal | $C270 / $FF80 / $C3C1 | Pass 0 skeleton | |
| Super C (U) | 128 KB | 128 KB | Vertical | $FB67 / $FACA / $E07F | Pass 0 skeleton | |
| Super Mario Bros 2 (U) (PRG 0) | 128 KB | 128 KB | Vertical | $EB8E / $FF50 / $FFF0 | Pass 0 skeleton | |
| Super Mario Bros 2 (U) (PRG 1) | 128 KB | 128 KB | Vertical | $EB94 / $FF50 / $FFF0 | Pass 0 skeleton | |
| Super Mario Bros 3 (U) (PRG 0) | 256 KB | 128 KB | Horizontal | $F486 / $FF40 / $F795 | Pass 0 skeleton | |
| Super Mario Bros 3 (U) (PRG 1) | 256 KB | 128 KB | Horizontal | $F486 / $FF40 / $F795 | Pass 0 skeleton | |
| Super Mario Bros 3 (U) (PRG 1) [a1] | 256 KB | 128 KB | Horizontal | $F486 / $FF40 / $F795 | Pass 0 skeleton | |
| Super Mario Bros 3 (U) (PRG 1) [a2] | 256 KB | 128 KB | Horizontal | $F486 / $FF40 / $F795 | Pass 0 skeleton | |
| Super Mario Bros 3 (U) (PRG 1) [a3] | 256 KB | 128 KB | Horizontal | $F486 / $FF40 / $F795 | Pass 0 skeleton | |
| Super Spike V'Ball (U) | 128 KB | 128 KB | Horizontal | $FF7E / $FF7B / $FF81 | Pass 0 skeleton | |
| Super Sprint (U) | 64 KB | 64 KB | Vertical | $DF8F / $FF00 / $FF00 | Pass 0 skeleton | |
| Super Spy Hunter (U) | 128 KB | 128 KB | Vertical | $C5B4 / $FFF6 / $C59C | Pass 0 skeleton | |
| Sword Master (U) | 128 KB | 128 KB | Vertical | $E100 / $E000 / $E175 | Pass 0 skeleton | |
| T&C 2 - Thrilla's Surfari (U) | 128 KB | 128 KB | Vertical | $C003 / $FF80 / $C003 | Pass 0 skeleton | |
| Tecmo NBA Basketball (U) | 128 KB | 256 KB | Vertical | $CD32 / $FFB0 / $FCC7 | Pass 0 skeleton | battery |
| Tecmo Super Bowl (U) | 256 KB | 128 KB | Horizontal | $C130 / $FFF0 / $C2C2 | Pass 0 skeleton | |
| Teenage Mutant Ninja Turtles 2 (U) | 256 KB | 256 KB | Horizontal | $FE0C / $FDA1 / $0050 | Pass 0 skeleton | |
| Teenage Mutant Ninja Turtles 3 (U) | 256 KB | 256 KB | Horizontal | $F814 / $F7A8 / $00E3 | Pass 0 skeleton | |
| Teenage Mutant Ninja Turtles Tournament Fighters (U) | 128 KB | 128 KB | Horizontal | $F219 / $F174 / $F85E | Pass 0 skeleton | |
| Terminator 2 - Judgement Day (U) | 128 KB | 128 KB | Vertical | $C0C0 / $FF8B / $C1FB | Pass 0 skeleton | |
| Terminator 2 - Judgement Day (U) (Prototype) | 128 KB | 128 KB | Vertical | $C000 / $E987 / $C124 | Pass 0 skeleton | |
| Terminator, The (U) | 128 KB | 128 KB | Horizontal | $C000 / $FED5 / $C1D3 | Pass 0 skeleton | |
| Tetris 2 (U) [!] | 128 KB | 128 KB | Vertical | $C68F / $FFD0 / $C710 | Pass 0 skeleton | |
| Tiny Toon Adventures (U) | 128 KB | 128 KB | Horizontal | $FE70 / $FDB7 / $FA22 | Pass 0 skeleton | |
| Tiny Toon Adventures 2 - Trouble in Wackyland (U) | 128 KB | 128 KB | Horizontal | $FE47 / $FDD3 / $F9E4 | Pass 0 skeleton | |
| Tiny Toon Adventures Cartoon Workshop (U) | 128 KB | 128 KB | Vertical | $E2B4 / $E2BA / $E2B7 | Pass 0 skeleton | |
| To The Earth (U) | 32 KB | 32 KB | Vertical | $E306 / $E144 / $9EC1 | Pass 0 skeleton | |
| Toki (U) | 128 KB | 256 KB | Horizontal | $FC1E / $F400 / $FFF7 | Pass 0 skeleton | |
| Tom & Jerry (and Tuffy) (U) | 128 KB | 128 KB | Horizontal | $07FD / $E034 / $07FA | Pass 0 skeleton | |
| Toobin (U) | 128 KB | 64 KB | Horizontal | $F40C / $FE00 / $F486 | Pass 0 skeleton | |
| Toobin (U) [a1] | 128 KB | 64 KB | Horizontal | $F40C / $FE00 / $F486 | Pass 0 skeleton | |
| Top Gun - The Second Mission (U) | 128 KB | 128 KB | Vertical | $E8EF / $E87A / $03E9 | Pass 0 skeleton | |
| Totally Rad (U) | 128 KB | 128 KB | Vertical | $E0BF / $E000 / $E19A | Pass 0 skeleton | |
| Toxic Crusaders (U) | 128 KB | 128 KB | Vertical | $C47E / $FFD0 / $C525 | Pass 0 skeleton | |
| Twin Cobra (U) | 128 KB | 128 KB | Vertical | $C000 / $FF00 / $51DF | Pass 0 skeleton | |
| Ultimate Air Combat (U) | 256 KB | 256 KB | Vertical | $E0F8 / $E03F / $E137 | Pass 0 skeleton | |
| Ultimate Basketball (U) | 128 KB | 128 KB | Vertical | $E2DD / $E12D / $FFF9 | Pass 0 skeleton | |
| Uninvited (U) | 128 KB | 128 KB | Horizontal | $ECC7 / $E800 / $EB49 | Pass 0 skeleton | |
| Vice - Project Doom (U) | 128 KB | 128 KB | Horizontal | $E5A2 / $E39E / $E1DA | Pass 0 skeleton | |
| Vindicators (U) | 64 KB | 32 KB | Vertical | $FE83 / $FF11 / $FF11 | Pass 0 skeleton | |
| WCW World Championship Wrestling (U) | 128 KB | 128 KB | Horizontal | $D3DF / $FFD8 / $D4CE | Pass 0 skeleton | |
| WWF King of the Ring (U) | 128 KB | 256 KB | Horizontal | $FDD3 / $FDEF / $FF63 | Pass 0 skeleton | |
| WWF Steel Cage Challenge (U) | 128 KB | 256 KB | Vertical | $C48B / $FF4F / $C4B7 | Pass 0 skeleton | |
| Wacky Races (U) | 128 KB | 128 KB | Horizontal | $F86E / $F800 / $E54A | Pass 0 skeleton | |
| Wario's Woods (U) | 256 KB | 256 KB | Horizontal | $C6BC / $FFB0 / $C710 | Pass 0 skeleton | |
| Wayne's World (U) | 128 KB | 128 KB | Vertical | $D7E3 / $FE47 / $D93F | Pass 0 skeleton | |
| Werewolf - The Last Warrior (U) | 128 KB | 128 KB | Horizontal | $C014 / $FF00 / $C077 | Pass 0 skeleton | |
| Where in Time is Carmen Sandiego (U) | 128 KB | 256 KB | Vertical | $E1A5 / $E000 / $E3AB | Pass 0 skeleton | |
| Where's Waldo (U) | 128 KB | 128 KB | Horizontal | $E237 / $E000 / $E468 | Pass 0 skeleton | |
| Whomp'Em (U) | 128 KB | 128 KB | Horizontal | $FC20 / $FF01 / $FF00 | Pass 0 skeleton | |
| Widget (U) | 128 KB | 128 KB | Vertical | $C103 / $FFC0 / $C106 | Pass 0 skeleton | |
| Wizardry - The Knight of Diamonds (U) | 128 KB | 128 KB | Vertical | $F991 / $F95A / $FCF9 | Pass 0 skeleton | battery |
| Wolverine (U) | 128 KB | 128 KB | Horizontal | $07FD / $FF50 / $FCFF | Pass 0 skeleton | |
| World Champ (U) [!] | 128 KB | 128 KB | Vertical | $C006 / $FFB0 / $C003 | Pass 0 skeleton | |
| Wurm (U) | 128 KB | 128 KB | Vertical | $EB5F / $E000 / $EF0A | Pass 0 skeleton | |
| Yoshi's Cookie (U) | 128 KB | 64 KB | Horizontal | $C5C8 / $F6DD / $D2E7 | Pass 0 skeleton | |
| Young Indiana Jones Chronicles, The (U) | 128 KB | 128 KB | Vertical | $F900 / $FEC1 / $FB00 | Pass 0 skeleton | |
| Zen Intergalactic Ninja (U) | 128 KB | 128 KB | Horizontal | $F5E4 / $F593 / $FCB8 | Pass 0 skeleton | |
| Zombie Nation (U) | 128 KB | 128 KB | Vertical | $FAD4 / $FD2A / $FC4C | Pass 0 skeleton |
_wip/MMC5/ — mapper 5 (10 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| Bandit Kings of Ancient China (U) | 256 KB | 128 KB | Horizontal | $F641 / $F500 / $FFD6 | Pass 0 skeleton | |
| Bandit Kings of Ancient China (U) [a1] | 256 KB | 128 KB | Horizontal | $5485 / $00A9 / $5565 | Pass 0 skeleton | |
| Castlevania 3 - Dracula's Curse (U) | 256 KB | 128 KB | Horizontal | $E053 / $E00B / $E11A | Pass 0 skeleton | |
| Gemfire (U) | 256 KB | 256 KB | Horizontal | $F60C / $F500 / $FE9C | Pass 0 skeleton | battery |
| L'Empereur (U) | 256 KB | 128 KB | Horizontal | $F64C / $F500 / $FF47 | Pass 0 skeleton | battery |
| L'Empereur (U) [a1] | 256 KB | 128 KB | Horizontal | $F64C / $F500 / $FF47 | Pass 0 skeleton | battery |
| Laser Invasion (U) | 128 KB | 128 KB | Horizontal | $E072 / $E001 / $F010 | Pass 0 skeleton | |
| Nobunaga's Ambition 2 (U) | 256 KB | 128 KB | Horizontal | $F641 / $F500 / $FF34 | Pass 0 skeleton | battery |
| Romance of the Three Kingdoms 2 (U) [!] | 256 KB | 256 KB | Horizontal | $F671 / $F500 / $FF66 | Pass 0 skeleton | battery |
| Uncharted Waters (U) | 512 KB | 128 KB | Horizontal | $F64C / $F500 / $FF3E | Pass 0 skeleton | battery |
_wip/NROM/ — mapper 0, 64 (35 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| 10-Yard Fight (U) | 32 KB | 8 KB | Horizontal | $8471 / $8000 / $84FF | Pass 0 skeleton | |
| 1942 (JU) | 32 KB | 8 KB | Horizontal | $C030 / $BF90 / $BF90 | Pass 0 skeleton | header reads mapper 64 - see the note below |
| Chubby Cherub (U) | 32 KB | 8 KB | Vertical | $82B7 / $8000 / $8331 | Pass 0 skeleton | |
| Circus Charlie | 16 KB | 8 KB | Horizontal | $C05A / $C000 / $C007 | Pass 0 skeleton | 127-byte footer |
| Dig Dug II (U) [!] | 32 KB | 8 KB | Vertical | $A749 / $A52D / $A52D | Pass 0 skeleton | |
| Elevator Action (U) | 32 KB | 8 KB | Horizontal | $8081 / $8000 / $8000 | Pass 0 skeleton | |
| Galaga (U) | 32 KB | 8 KB | Horizontal | $C0C8 / $C000 / $C000 | Pass 0 skeleton | |
| Gyromite (JUE) | 32 KB | 8 KB | Vertical | $8079 / $8000 / $8000 | Pass 0 skeleton | |
| Hydlide (U) | 32 KB | 8 KB | Horizontal | $8003 / $8000 / $8003 | Pass 0 skeleton | |
| Ice Hockey (U) | 32 KB | 8 KB | Vertical | $805A / $8000 / $8000 | Pass 0 skeleton | |
| Kung Fu (U) | 32 KB | 8 KB | Vertical | $82D6 / $8258 / $FFF0 | Pass 0 skeleton | |
| Kung Fu (U) (a1) | 32 KB | 8 KB | Vertical | $82D6 / $8258 / $FFF0 | Pass 0 skeleton | |
| Mach Rider (JU) | 32 KB | 8 KB | Horizontal | $8070 / $8000 / $8147 | Pass 0 skeleton | four-screen flag |
| Mach Rider (JU) (a1) | 32 KB | 8 KB | Horizontal | $8070 / $8000 / $8147 | Pass 0 skeleton | four-screen flag |
| Magmax (U) | 32 KB | 8 KB | Horizontal | $BD33 / $BC33 / $BC33 | Pass 0 skeleton | |
| Magmax (U) (Prototype) | 32 KB | 8 KB | Horizontal | $BD33 / $BC33 / $BC33 | Pass 0 skeleton | |
| Ms Pac-Man (Namco) (U) | 32 KB | 8 KB | Horizontal | $C107 / $FFF7 / $C198 | Pass 0 skeleton | |
| Ms Pac-Man (U) | 32 KB | 8 KB | Horizontal | $FB86 / $FEE0 / $FBE1 | Pass 0 skeleton | |
| NES Test Cart (Official Nintendo) (U) | 32 KB | 8 KB | Vertical | $8328 / $8370 / $8370 | Pass 0 skeleton | |
| Othello (U) | 32 KB | 8 KB | Horizontal | $D6B4 / $8000 / $804E | Pass 0 skeleton | |
| Pipe Dream (U) | 32 KB | 32 KB | Vertical | $8FEA / $8000 / $912B | Pass 0 skeleton | |
| Port Test Cartridge (U) | 32 KB | none | Vertical | $CC49 / $C000 / $CC17 | Pass 0 skeleton | |
| Pro Action Replay (No Cart Present) (U) | 32 KB | 8 KB | Horizontal | $0000 / $0000 / $0000 | Pass 0 skeleton | all vectors $0000 |
| Pro Action Replay (Rev B) (U) | 32 KB | 8 KB | Horizontal | $F021 / $808A / $F020 | Pass 0 skeleton | |
| Seicross (U) | 32 KB | 8 KB | Vertical | $8858 / $8000 / $FD0E | Pass 0 skeleton | |
| Slalom (U) | 32 KB | 8 KB | Vertical | $8123 / $8050 / $FEDF | Pass 0 skeleton | |
| Soccer (JU) | 32 KB | 8 KB | Vertical | $809F / $8000 / $8000 | Pass 0 skeleton | |
| Spelunker (U) [!] | 32 KB | 8 KB | Vertical | $84C6 / $8000 / $8513 | Pass 0 skeleton | |
| Spy Vs Spy (U) | 32 KB | 8 KB | Horizontal | $8066 / $8000 / $FFC7 | Pass 0 skeleton | |
| Sqoon (U) | 32 KB | 8 KB | Vertical | $8014 / $8000 / $80F1 | Pass 0 skeleton | |
| Stack-Up (JU) | 32 KB | 8 KB | Horizontal | $81AD / $8100 / $81E6 | Pass 0 skeleton | |
| Super Mario Bros (JU) (PRG 0) | 32 KB | 8 KB | Vertical | $8082 / $8000 / $FFF0 | Pass 0 skeleton | |
| Super Mario Bros (JU) (PRG 1) | 32 KB | 8 KB | Vertical | $8082 / $8000 / $FFF0 | Pass 0 skeleton | |
| Tag Team Wrestling (U) | 32 KB | 8 KB | Horizontal | $FFCD / $FD43 / $FD43 | Pass 0 skeleton | |
| U-Force Test Cartridge (U) | 32 KB | 8 KB | Vertical | $844C / $8000 / $8000 | Pass 0 skeleton |
_wip/UNROM/ — mapper 2 (97 projects)
| Project | PRG | CHR | Mirroring | Vectors (NMI / RESET / IRQ) | State | Notes |
|---|---|---|---|---|---|---|
| 1943 (U) | 128 KB | none | Horizontal | $C226 / $C149 / $C235 | Pass 0 skeleton | |
| 3-D Battles of World Runner, The (U) | 128 KB | none | Vertical | $FFC0 / $FF00 / $FEEC | Pass 0 skeleton | |
| Alfred Chicken (U) | 128 KB | none | Horizontal | $C7E3 / $C5C6 / $C84A | Pass 0 skeleton | |
| Amagon (U) | 128 KB | none | Vertical | $D8FE / $C06C / $FFF9 | Pass 0 skeleton | |
| Amagon (U) [a1] | 128 KB | none | Vertical | $D8FE / $C06C / $FFF9 | Pass 0 skeleton | |
| Amagon (U) [a2] | 128 KB | none | Vertical | $D8FE / $C06C / $FFF9 | Pass 0 skeleton | |
| Archon (U) | 128 KB | none | Horizontal | $FB12 / $C008 / $FB12 | Pass 0 skeleton | four-screen flag |
| Athena (U) | 128 KB | none | Vertical | $C0CA / $C008 / $C008 | Pass 0 skeleton | |
| Athena (U) [a1] | 128 KB | none | Vertical | $C0CA / $C008 / $C008 | Pass 0 skeleton | |
| Best of the Best Championship Karate (U) | 256 KB | none | Vertical | $D110 / $CDDC / $CDDC | Pass 0 skeleton | |
| Blades of Steel (U) | 128 KB | none | Vertical | $C204 / $C1C5 / $C266 | Pass 0 skeleton | |
| Blues Brothers, The (U) | 128 KB | none | Vertical | $FC33 / $F499 / $F499 | Pass 0 skeleton | |
| California Games (U) | 128 KB | none | Vertical | $FF88 / $FFB0 / $FFB0 | Pass 0 skeleton | |
| California Games (U) [a1] | 128 KB | none | Vertical | $FF88 / $FFB0 / $FFB0 | Pass 0 skeleton | |
| Casino Kid (U) | 128 KB | none | Horizontal | $E5FA / $C000 / $E608 | Pass 0 skeleton | |
| Casino Kid 2 (U) | 128 KB | none | Horizontal | $EA74 / $C000 / $EA82 | Pass 0 skeleton | |
| Castelian (U) | 128 KB | none | Vertical | $C008 / $C154 / $C991 | Pass 0 skeleton | |
| Castle of Dragon (U) | 128 KB | none | Vertical | $C0F4 / $C000 / $C0D8 | Pass 0 skeleton | |
| Castlevania (U) (PRG 0) | 128 KB | none | Vertical | $C052 / $C008 / $C0BB | Pass 0 skeleton | |
| Castlevania (U) (PRG 1) | 128 KB | none | Vertical | $C052 / $C008 / $C0BF | Pass 0 skeleton | |
| Championship Pool (U) | 128 KB | none | Vertical | $D73D / $E3E7 / $D880 | Pass 0 skeleton | |
| Color A Dinosaur (U) | 128 KB | none | Vertical | $C161 / $C000 / $C15F | Pass 0 skeleton | |
| Commando (U) | 128 KB | none | Horizontal | $C0AB / $C06D / $0000 | Pass 0 skeleton | |
| Contra (U) | 128 KB | none | Vertical | $C060 / $C001 / $C0B5 | Pass 0 skeleton | |
| Dick Tracy (U) | 128 KB | none | Vertical | $C7D2 / $C6A0 / $C966 | Pass 0 skeleton | |
| Double Dribble (U) (PRG 0) | 128 KB | none | Vertical | $C036 / $C001 / $C08F | Pass 0 skeleton | |
| Double Dribble (U) (PRG 1) [!] | 128 KB | none | Vertical | $C036 / $C001 / $C08F | Pass 0 skeleton | |
| Dr Chaos (U) | 128 KB | none | Vertical | $C000 / $C815 / $0700 | Pass 0 skeleton | |
| Duck Tales (U) | 128 KB | none | Vertical | $C000 / $FEE0 / $C000 | Pass 0 skeleton | |
| Duck Tales (U) (Prototype) | 128 KB | none | Vertical | $C000 / $FEE0 / $C000 | Pass 0 skeleton | |
| Duck Tales 2 (U) | 128 KB | none | Vertical | $C651 / $C088 / $C088 | Pass 0 skeleton | |
| Fantastic Adventures of Dizzy, The (1993 Version) (U) | 256 KB | none | Vertical | $C007 / $C02D / $FFF9 | Pass 0 skeleton | |
| Fantastic Adventures of Dizzy, The (Aladdin) (UE) | 256 KB | none | Vertical | $C007 / $EE20 / $FFF9 | Pass 0 skeleton | |
| Fist of the North Star (U) | 128 KB | none | Vertical | $CE32 / $C000 / $CEDF | Pass 0 skeleton | |
| Flight of the Intruder (U) | 128 KB | none | Vertical | $C600 / $C000 / $C68B | Pass 0 skeleton | |
| Flying Dragon - The Secret Scroll (U) | 128 KB | none | Vertical | $C171 / $C118 / $C118 | Pass 0 skeleton | |
| Fun House (U) | 128 KB | none | Vertical | $C436 / $C3D4 / $C54B | Pass 0 skeleton | |
| Ghosts'n Goblins (U) | 128 KB | none | Vertical | $C0F0 / $C008 / $C008 | Pass 0 skeleton | |
| Goonies 2, The (U) | 128 KB | none | Vertical | $C07C / $C008 / $C0C9 | Pass 0 skeleton | |
| Goonies 2, The (U) [a1] | 128 KB | none | Vertical | $C07C / $C008 / $C0C9 | Pass 0 skeleton | |
| Guardian Legend, The (U) | 128 KB | none | Vertical | $DC75 / $FEDE / $DCF3 | Pass 0 skeleton | |
| Gun Smoke (U) | 128 KB | none | Horizontal | $E4C6 / $E651 / $E4C6 | Pass 0 skeleton | |
| Hero Quest (U) (Prototype) [!] | 128 KB | none | Horizontal | $C078 / $C000 / $C13D | Pass 0 skeleton | |
| Ikari Warriors (U) (PRG 0) | 128 KB | none | Horizontal | $C0C6 / $C008 / $61E3 | Pass 0 skeleton | |
| Ikari Warriors (U) (PRG 1) [!] | 128 KB | none | Horizontal | $C0C6 / $C008 / $61E3 | Pass 0 skeleton | |
| Indiana Jones and the Last Crusade (UBI Soft) (U) | 128 KB | none | Horizontal | $FF01 / $C014 / $FFD6 | Pass 0 skeleton | |
| Jack Nicklaus' Greatest 18 Holes of Champ. Golf (U) | 128 KB | none | Vertical | $C04A / $C001 / $C0C0 | Pass 0 skeleton | |
| Jackal (U) [a1] | 128 KB | none | Vertical | $C292 / $C23D / $C2EA | Pass 0 skeleton | |
| Jimmy Connor's Tennis (U) | 128 KB | none | Horizontal | $C100 / $FEE1 / $FF58 | Pass 0 skeleton | |
| Jordan Vs Bird - One On One (U) | 128 KB | none | Vertical | $C079 / $C000 / $C077 | Pass 0 skeleton | |
| Klash Ball (U) | 128 KB | none | Horizontal | $ED83 / $C000 / $EE0C | Pass 0 skeleton | |
| Lifeforce (U) | 128 KB | none | Vertical | $E76B / $E70A / $E7D1 | Pass 0 skeleton | |
| Marvel's X-Men (U) | 128 KB | none | Vertical | $C006 / $FFB0 / $C003 | Pass 0 skeleton | |
| Marvel's X-Men (U) [a1] | 128 KB | none | Vertical | $C006 / $FFB0 / $C003 | Pass 0 skeleton | |
| Metal Gear (U) | 128 KB | none | Vertical | $C06C / $C008 / $C006 | Pass 0 skeleton | |
| Micro Machines (U) | 256 KB | none | Vertical | $0300 / $F750 / $FFFF | Pass 0 skeleton | |
| Paperboy 2 (U) | 256 KB | none | Horizontal | $CA2E / $CA69 / $CA68 | Pass 0 skeleton | |
| Prince of Persia (U) | 128 KB | none | Vertical | $FF13 / $C008 / $FFEF | Pass 0 skeleton | |
| Prince of Persia (U) [a1] | 128 KB | none | Vertical | $FF13 / $C008 / $FFEF | Pass 0 skeleton | |
| Prince of Persia (U) [a2] | 128 KB | none | Vertical | $FF13 / $C008 / $FFEF | Pass 0 skeleton | |
| Pro Wrestling (U) | 128 KB | none | Vertical | $FCBC / $FBB0 / $FFF0 | Pass 0 skeleton | |
| Puss 'n Boots - Pero's Great Adventure (U) | 128 KB | none | Vertical | $D51E / $C013 / $D648 | Pass 0 skeleton | |
| Quattro Adventure (Aladdin) (U) | 256 KB | none | Vertical | $C007 / $C00A / $0000 | Pass 0 skeleton | |
| Rainbow Islands - The Story of Bubble Bobble 2 (U) | 128 KB | none | Horizontal | $E74C / $DE59 / $E796 | Pass 0 skeleton | |
| Rally Bike (U) | 128 KB | none | Vertical | $C089 / $C008 / $D244 | Pass 0 skeleton | |
| Rambo (U) | 128 KB | none | Vertical | $EE55 / $C000 / $C000 | Pass 0 skeleton | |
| Renegade (U) | 128 KB | none | Vertical | $FE71 / $FE98 / $D600 | Pass 0 skeleton | |
| Robo Warrior (U) | 128 KB | none | Vertical | $CF75 / $C0D0 / $FFF9 | Pass 0 skeleton | |
| Rygar (U) | 128 KB | none | Vertical | $C0F6 / $C000 / $C0F6 | Pass 0 skeleton | |
| Section Z (U) | 128 KB | none | Vertical | $C45F / $C403 / $C518 | Pass 0 skeleton | |
| Silent Service (U) | 128 KB | none | Vertical | $ED89 / $C020 / $EDAF | Pass 0 skeleton | |
| Silent Service (U) [a1] | 128 KB | none | Vertical | $ED89 / $C020 / $EDAF | Pass 0 skeleton | |
| Skate or Die! (U) [a1] | 128 KB | none | Vertical | $C072 / $C001 / $C0E2 | Pass 0 skeleton | |
| Star Trek - The Next Generation (U) | 128 KB | none | Horizontal | $C11F / $FFF1 / $C19E | Pass 0 skeleton | |
| Starship Hector (U) | 128 KB | none | Vertical | $D99C / $D6A5 / $D9DF | Pass 0 skeleton | |
| Stinger (U) | 128 KB | none | Vertical | $C000 / $C078 / $C05E | Pass 0 skeleton | |
| Super Cars (U) | 128 KB | none | Horizontal | $C6E0 / $C000 / $0000 | Pass 0 skeleton | |
| Super Glove Ball (U) | 128 KB | none | Vertical | $FE03 / $C032 / $F791 | Pass 0 skeleton | |
| Super Pitfall (U) | 128 KB | none | Vertical | $C0F3 / $C020 / $61E3 | Pass 0 skeleton | |
| Swords and Serpents (U) | 128 KB | none | Vertical | $C0B4 / $C049 / $C047 | Pass 0 skeleton | |
| Swords and Serpents (U) [a1] | 128 KB | none | Vertical | $C0B4 / $C049 / $C047 | Pass 0 skeleton | 128-byte footer |
| Terra Cresta (U) | 128 KB | none | Horizontal | $C709 / $C494 / $C494 | Pass 0 skeleton | |
| Thundercade (U) | 128 KB | none | Horizontal | $C0B1 / $C008 / $C008 | Pass 0 skeleton | |
| Times of Lore (U) | 128 KB | none | Vertical | $C26B / $C000 / $C30B | Pass 0 skeleton | |
| Top Gun (U) | 128 KB | none | Horizontal | $EA8A / $EA23 / $EB04 | Pass 0 skeleton | |
| Total Recall (U) | 128 KB | none | Horizontal | $C093 / $C196 / $C182 | Pass 0 skeleton | |
| Trog (U) | 128 KB | none | Vertical | $F008 / $C06F / $C06F | Pass 0 skeleton | |
| Trojan (U) | 128 KB | none | Vertical | $C16A / $C0F5 / $C0F5 | Pass 0 skeleton | |
| Trojan (U) [a1] | 128 KB | none | Vertical | $DE0D / $1880 / $3CA2 | Pass 0 skeleton | |
| Twin Eagle (U) | 128 KB | none | Vertical | $C10D / $FFC0 / $C0E1 | Pass 0 skeleton | |
| Ultimate Stuntman (U) | 256 KB | none | Vertical | $CB61 / $C004 / $C004 | Pass 0 skeleton | |
| WWF Wrestlemania Challenge (U) | 128 KB | none | Vertical | $C000 / $FFCD / $C018 | Pass 0 skeleton | |
| Wall Street Kid (U) | 128 KB | none | Horizontal | $F95C / $C000 / $F9E2 | Pass 0 skeleton | |
| Wall Street Kid (U) [a1] | 128 KB | none | Horizontal | $F95C / $C000 / $F9E2 | Pass 0 skeleton | 65536-byte footer |
| Wall Street Kid (U) [a2] | 128 KB | none | Horizontal | $F95C / $C000 / $F9E2 | Pass 0 skeleton | 65536-byte footer |
| Wayne Gretzky Hockey (U) | 128 KB | none | Vertical | $C10A / $C000 / $C378 | Pass 0 skeleton | |
| Winter Games (U) | 128 KB | none | Horizontal | $06FB / $C040 / $E295 | Pass 0 skeleton | |
| All 851 projects, all byte-identical for the whole ROM. |
7. The special cases
7.1 Almost all of the tier is a banked mapper
Only 34 of the 851 are mapper 0, and only two have a PRG small enough to sit at a single CPU address:
| PRG size | Projects |
|---|---|
| 16 KB | 1 — Circus Charlie |
| 32 KB | 149 |
| 64 KB | 42 |
| 128 KB | 522 |
| 256 KB | 127 |
| 512 KB | 10 |
| 1536 KB | 1 — Action 52 (U) [!] |
Everything else is a banked mapper — MMC1 (221), MMC3 (239), UNROM (97), Color Dreams (40), AxROM (39), the Codemasters family (45) and so on. Pass 1 on any of those is a per-bank job: the tracer needs to know which bank is mapped where before it can decide what is code.
7.2 A quarter of the tier has no CHR
226 projects declare zero CHR banks — the mapper supplies CHR RAM instead.
There is no chr.bin, no chr.s, and the linker has no CHR area — a CHR
area with fill = yes and no segment would emit zero padding and break
byte-identity. Port Test Cartridge (U) and Videomation (U) are two of
them; so are Mega Man (U), Castlevania (U) (PRG 0), Metroid (U) and
every other MMC1 title in the store.
7.3 Six ROMs have trailing bytes the header does not account for
| Project | Trailing bytes | What they look like |
|---|---|---|
Circus Charlie |
127 | the text Circus Charlie - Damaged Cybernetics, then zero padding |
Crystalis (U) [a1] |
127 | a 127-byte footer |
Ninja Gaiden (U) [a2] |
128 | a 128-byte footer |
Swords and Serpents (U) [a1] |
128 | a 128-byte footer |
Wall Street Kid (U) [a1] |
65536 | 64 KB of graphics data |
Wall Street Kid (U) [a2] |
65536 | 64 KB of graphics data |
The generator emits a fourth memory area for them:
TRAILER: start = $0000, size = $007F, fill = yes;
The two Wall Street Kid dumps are a different matter: their header declares
zero CHR banks and 8 PRG banks, and the file is 196,624 bytes — 64 KB
more than the header accounts for. The trailing 64 KB is plainly graphics
data, so the header's size fields are wrong (either the CHR count should be
8, or the PRG count 12). The skeleton reproduces the file exactly either
way, but do not assume the header's size fields are right for these two
— a Pass 1 on them has to decide which reading is correct first.
7.4 Some projects have odd header bytes
| Project | byte 6 | byte 7 | What it means |
|---|---|---|---|
1942 (JU) |
$00 |
$44 |
Bytes 7-15 spell DiskDude! — ASCII overwrote the mapper's upper nybble, so the header reads mapper 64 when the intended mapper is 0. |
Mach Rider (JU), (a1) |
$08 |
$00 |
Bit 3 (four-screen VRAM) is set on a mapper-0 image. |
Pro Action Replay (No Cart Present) (U) |
$00 |
$00 |
All three vectors are $0000 — the image carries no vector table. Its code starts at $8000 with SEI / CLD / LDA #$50 / STA $2000, and a JMP $8000 plus the string IMAGINEER sit near the end of the PRG, so it is a loader image rather than a self-booting cartridge. |
None of this affects byte-identity — the header is included verbatim — but all three change what Pass 1 has to do.
Byte 7's lower nybble is non-zero on 58 of the 851 ROMs, and this is
almost always a watermark rather than a header field. 55 of them carry the
literal string DiskDude! at bytes 7-15, two more carry DisNi0330, and one
(Hot Slot (UE)) carries byKH+KEN. Since 'D' is $44, byte 7 picks up
$4 in its lower nybble. Only byte 7's upper nybble carries mapper
bits, so these ROMs still read the mapper they are filed under — the noise
is in the bits the mapper does not use.
Twelve ROMs set the four-screen bit (byte 6 bit 3). Four of them sit on
boards that support four-screen VRAM (MAPPER73/Punch-Out!! (U) and the
three MMC3 titles Gauntlet (U), Gauntlet 2 (U) and King's Quest V (U)).
The other eight sit on boards that do not — Demon Sword (U),
Muppet Adventure - Chaos at the Carnival (U) and RoadBlasters (U) on
mapper 65, Back to the Future 2 & 3 (U) and Ghoul School (U) on MMC1,
Archon (U) on mapper 2, and the two Mach Rider dumps on mapper 0. Every
one of the twelve is flagged four-screen flag in the inventory above.
7.5 The vectors are not always in the last bank
nesdis.py reads the vectors from the last six bytes of the PRG image,
which is correct for the common layouts (the fixed bank is the last one in
the file) but not for every mapper here. A project whose vectors do not
resolve to plausible code needs its seeds supplied by hand with
--extra-seed.
8. Open work, per project
Every Pass 0 project owes the same three passes. AGENTS.md fixes the order:
Pass 1 is the code/data split and stops for review; Pass 2 replaces
address-derived labels; Pass 3 names data tables and structures. Skipping
straight to a guessy rewrite is not allowed.
Pass 1 — the code/data split
python3 _tools/nesdis.py --prg prg.bin --base 0x8000 \
--project "<name>" --out prg.s --locals locals.inc
--base 0x8000 for a 32 KB NROM-256 PRG; a banked image needs its banks
traced separately, because the whole image does not sit at one address.
Requirements for the emitted prg.s:
- Every instruction carries the canonical audit comment
; CPU:$C123 PRG:0123 AD 21 03, starting at column 35. - Unreached bytes stay as explicit
.byte/.incbinblocks with their ROM provenance. Nothing is deleted or reformatted. - Re-align the comments after any Pass 3 substitution with
_tools/align_audit_comments.py— it is whitespace-only and cannot change the bytes.
Known traps for this tier specifically:
- A plain vector trace reaches only ~15% of a real game. Most code sits
behind computed dispatch. Look for
jmp ($xx), and for dispatchers that pop the table address withpla.--auto-seedplus a couple of--extra-seedaddresses tookMario Bros (JU)from 14.6% to 72.2%. - Declare the dispatch table and the tracer will follow it. A 16-entry
game-state table that the tracer cannot see is the single biggest loss of
coverage in this tier: the promoted
Volleyball (U)needed--table 85E1:11, without which only 66 % of the image traced. The same applies to the Mesen Code Data Logger capture, which is what promoted 1,757 further bytes from data to code there. - Control-flow targets must win over fall-through. A fall-through decode whose operand spans an address another path branches to is the wrong decode.
- Branch targets inside a surviving instruction must be pruned from the target set, or the label is referenced but never defined and the file does not assemble at all.
- Undocumented opcodes silently truncate a trace.
nesdis.py --undocumenteddecodes all 105; the default is off, so the trace must be re-run with it before Pass 1 is called done. ca65 implements none of them, so they stay as explicit.bytewith the disassembly in the comment. - RESET and IRQ are usually the same address. The semantic-name map must
not overwrite on collision, or the primary entry gets renamed
IrqHandler. Pro Action Replay (No Cart Present) (U)has no vectors at all — seed it by hand with--extra-seed 0x8000.
Pass 2 — labels
Replace the address-derived Label_XXXX definitions and every raw $XXXX
call operand. _tools/apply_pass2_map.py applies a map;
_tools/derive_branch_names.py derives the internal branch-target names.
Golf (JU) (promoted to NROM/Golf (JU) on 2026-10-21) was the worked
example: 108 of 112 subroutine entries
named, but still carrying hundreds of internal Label_ branch targets.
Pass 3 — data and semantics
Semantic zero-page aliases, applied only at the sites where the role is
proven (_tools/apply_zp_aliases.py), and named data tables. Addresses
whose role is not yet determined keep the neutral ZpXX form.
Per-project notes
Golf (JU)— promoted toNROM/Golf (JU)on 2026-10-21: 4,217 instructions over 13,541 lines ofprg.s, all 349 internal branch targets named (339 derived + 10 fall-through-only), audit comments converted to the canonical; CPU:$XXXX PRG:XXXX AA BBform at column 35, and the projectREADME.mdrewritten. Its whole-ROM compare verifies byte-identical.Volleyball (U)— promoted toNROM/Volleyball (U)on 2026-10-21. Pass 1, Pass 2 and Pass 3 were complete on 2026-10-20: 11,395 instructions / 23,926 code bytes (73.0 %), 8,842 data bytes, 0 unclassified. The split needed the game state dispatch table at$85E1declared to the tracer (--table 85E1:11) — without it only 66 % of the image is traced — and a Mesen Code Data Logger capture taken while a random-input bot played the attract demo, which promoted 1,757 bytes from data to code. Pass 2 named all 1,989 labels: 730 read out of the code by hand, 1,221 internal branch targets derived mechanically, leaving zeroLabel_XXXXand zero raw$XXXXcall or branch operands. Pass 3 named the zero page, the$0500ball structure and all 37 data blocks, andapply_symbols.py --reportreports zero multi-alias residue. The projectREADME.mdhas the power-on flow analysis (the whole game runs from the NMI handler) and the Pass 3 data-table inventory. The only residue is the mapping of the ten near-identical per-nation copies of the player movement and ball routines onto the ten selectable nations.- Every other project starts from zero.
9. Promoting a project
git mv "_wip/<MAPPER>/<name>" "<MAPPER>/<name>"— the folders are already flat, so nothing moves inside.- Confirm the whole-ROM compare still passes after the move.
- Update the root
README.mdinventory (the row moves from this file toREADME.md),TODO.mdandAGENTS.md. - No
_toolspath change is needed: both tiers sit two levels deep, so../../_tools/is correct either way. - Remove the
_wip/folder afterwards.git mvonly moves the tracked files, so the old folder survives with its untracked build artifacts (*.o,reconstructed.nes,reconstructed.lbl,reconstructed.map) and sometimes with a staleREADME.mdleft behind. A leftover folder counts as a project in every "how many projects are in this tier" tally while having no source to build —Xevious (U)andZanac (U)both left one behind on 2026-10-20, and both were cleaned up on 2026-10-21.
10. Tooling
_tools/make_skeleton.py created every Pass 0 skeleton in this tier:
python3 _tools/make_skeleton.py "_wip/MMC3/Battletoads (U)" ...
It reads the .nes, splits it into header.bin / prg.bin / chr.bin /
trailer.bin, writes the ca65 sources, the linker config, the Makefile, the
symbols/locals includes and the project README, and copies the ROM to
rom.nes. It is idempotent and refuses to overwrite an existing prg.s,
Makefile, linker.cfg, symbols.inc or locals.inc unless --force is
given — that guard is what stopped it from flattening Golf (JU)'s real
disassembly.
The generator's mirroring value was wrong until 2026-10-21. It masked
header byte 6 with 0x03, so the battery bit (bit 1) leaked into the
mirroring value and every battery-backed ROM's README claimed
Mirroring | Four-screen while its own Four-screen VRAM row said no.
The mask is now 0x01, and the 56 affected per-project READMEs were
corrected in place. The rule the repo follows is the one AGENTS.md fixes:
mirroring is byte 6 bit 0 (0 = Horizontal, 1 = Vertical), the
four-screen fact is byte 6 bit 3 and has its own row, and the battery flag
is byte 6 bit 1.
--layout picks the linker layout: flat (the default, and what this tier
uses) places the memory areas at .nes file offsets and works for any ROM
size; cpu places the PRG area at the CPU address it is mapped at, which is
only possible for a 16 KB or 32 KB PRG.
Two rules it encodes that are easy to get wrong by hand:
- ld65 writes the output file in MEMORY declaration order, not address
order. The areas must be declared in the order the bytes appear in the
.nesfile:HEADER, PRG, CHR, TRAILER. - Memory area sizes are hexadecimal.
size = $127is 295 bytes, not 127. The footer size is$007F.