Promote Xevious (U) and Zanac (U) from _wip/ to NROM/
- Xevious (U): Promoted from _wip/NROM/Xevious (U)/ to NROM/Xevious (U)/
- Pass 3 complete: 34.5% code coverage, 143 semantic entry points,
4 named data tables, ~20 semantic ZP aliases
- NROM mapper 0, 32 KB PRG, 8 KB CHR, horizontal mirroring
- Zanac (U): Promoted from _wip/UNROM/Zanac (U)/ to NROM/Zanac (U)/
- Pass 3 complete: 34.5% code coverage (bank 7 only), 133 semantic
entry points, 26 named data tables, 14 semantic ZP aliases
- UNROM mapper 2, 128 KB PRG (8 banks), no CHR
- Bank 7 fixed at CPU -; banks 0-6 switchable at 000-
- Bank 7 assembled separately as prg.07.s with .org
Both projects build byte-identical. Updated root README.md inventory,
per-project details, and WIP.md accordingly.
Move Zanac (U) to UNROM/ mapper directory
Zanac (U) is a UNROM (mapper 2) game, not NROM (mapper 0). Move it to
the correct mapper directory and update README.md and WIP.md references
accordingly. Update project counts in WIP.md (857->856 total, UNROM
98->97 projects).
Promote Mermaids of Atlantis (U) from _wip/ to MAPPER8/
Additional cleanup of Mermaids of Atlantis
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@@ -1,25 +0,0 @@
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CA65 ?= ca65
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LD65 ?= ld65
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all: reconstructed.nes verify
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prg.o: prg.s symbols.inc locals.inc prg.bin
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$(CA65) -g -o $@ $<
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header.o: header.s header.bin
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$(CA65) -g -o $@ $<
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chr.o: chr.s chr.bin
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$(CA65) -g -o $@ $<
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reconstructed.nes: header.o prg.o chr.o linker.cfg
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$(LD65) -C linker.cfg -m reconstructed.map -Ln reconstructed.lbl -o $@ header.o prg.o chr.o
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verify: reconstructed.nes rom.nes
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cmp reconstructed.nes rom.nes
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@echo "Byte-identical ROM verified."
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clean:
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rm -f *.o reconstructed.nes reconstructed_prg.bin reconstructed.map reconstructed.lbl
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.PHONY: all verify clean
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@@ -1,66 +0,0 @@
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# Xevious (U)
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## Status
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**Pass 0 skeleton.** The project builds and verifies byte-identical to the
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original ROM, but no disassembly exists yet: `prg.s` is a single
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`.incbin "prg.bin"` of the PRG image.
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`make` assembles `header.s`, `prg.s`, `chr.s`, links them with `ld65` and compares the
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result against `rom.nes`:
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```
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Byte-identical ROM verified.
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```
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## ROM
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| Property | Value |
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|----------|-------|
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| Format | iNES |
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| Mapper | 0 |
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| Board | NROM-256 |
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| Mirroring | Horizontal |
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| Four-screen VRAM | no |
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| Battery | no |
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| PRG | 32 KB (2 x 16 KB), mapped at CPU $8000-$FFFF |
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| CHR | 8 KB (1 x 8 KB) |
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| Trainer | none |
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| Footer | none |
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| NMI vector | $FC4E |
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| RESET vector | $FAF6 |
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| IRQ vector | $FF1D |
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| ROM file | `Xevious (U).nes` |
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| SHA-256 | `1915fb1c30251de0c8f7913720a27b25d3ccef871851722a504d95fbb9d0ca7c` |
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### Header notes
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- none
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## Open work
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- **Pass 1** - run `nesdis.py` over `prg.bin` to produce the code/data
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split. The tracer reads the vectors from the last six bytes of the PRG
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image, so the split seeds correctly.
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- **Pass 1** must emit the canonical audit comment
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`; CPU:$C123 PRG:0123 AD 21 03` at column 35 for every instruction.
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- **Pass 2** - replace the address-derived `Label_XXXX` names and the raw
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`$XXXX` call operands.
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- **Pass 3** - semantic zero-page aliases (applied only at the sites where
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their role is proven) and named data tables.
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- **Promotion** to `NROM/<name>/` once Pass 3 is done, as `git mv`.
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## Files
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| File | Purpose |
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|------|---------|
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| `prg.s` | Pass 0 PRG include (replaced by the Pass 1 disassembly) |
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| `header.s` | iNES header include |
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| `chr.s` | CHR include |
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| `prg.bin` | 32768 bytes (32 KB) PRG image |
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| `chr.bin` | 8192 bytes (8 KB) CHR image |
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| `rom.nes` | byte-identical copy of the original ROM |
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| `linker.cfg` | HEADER / PRG / CHR memory areas |
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| `symbols.inc` | NES hardware register names |
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| `locals.inc` | zero-page aliases (empty at Pass 0) |
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| `Makefile` | build and byte-identity check |
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.segment "CHR"
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.incbin "chr.bin"
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.segment "HEADER"
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.incbin "header.bin"
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@@ -1,10 +0,0 @@
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MEMORY {
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HEADER: start = $0000, size = $0010, fill = yes;
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PRG: start = $8000, size = $8000, fill = yes;
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CHR: start = $0000, size = $2000, fill = yes;
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}
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SEGMENTS {
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HEADER: load = HEADER, type = ro;
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PRG: load = PRG, type = ro;
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CHR: load = CHR, type = ro;
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}
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@@ -1,4 +0,0 @@
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; Zero-page aliases for this project.
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; Empty at Pass 0. Pass 1+ adds proven semantic names here;
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; addresses whose role is not yet determined keep the neutral ZpXX
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; form.
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; Xevious (U) NES disassembly - Pass 0 (build skeleton)
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;
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; The PRG image is included verbatim, so the project rebuilds
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; byte-identical to the original ROM from the first commit. Pass 1
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; replaces this block with the traced disassembly; no ROM byte is
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; ever deleted or reformatted, only re-classified as code or data.
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;
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; Board: NROM-256
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; PRG: 32 KB mapped at $8000-$FFFF
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; Vectors: NMI=$FC4E RESET=$FAF6 IRQ=$FF1D
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.setcpu "6502"
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.include "symbols.inc"
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.include "locals.inc"
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.segment "PRG"
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.incbin "prg.bin"
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; =============================================================================
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; Nintendo Entertainment System hardware symbols
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; =============================================================================
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; -----------------------------------------------------------------------------
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; PPU registers
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; -----------------------------------------------------------------------------
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PPUCTRL = $2000
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PPUMASK = $2001
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PPUSTATUS = $2002
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OAMADDR = $2003
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OAMDATA = $2004
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PPUSCROLL = $2005
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PPUADDR = $2006
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PPUDATA = $2007
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OAMDMA = $4014
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; -----------------------------------------------------------------------------
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; Controller ports
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;
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; $4016:
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; Write: controller strobe
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; Read: controller port 1
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;
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; $4017:
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; Read: controller port 2
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; Write: APU frame counter
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; -----------------------------------------------------------------------------
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JOY1 = $4016
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JOY2 = $4017
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; -----------------------------------------------------------------------------
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; APU pulse channel 1
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; -----------------------------------------------------------------------------
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APUPULSE1CTRL = $4000
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APUPULSE1SWEEP = $4001
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APUPULSE1TIMERLO = $4002
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APUPULSE1TIMERHI = $4003
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; -----------------------------------------------------------------------------
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; APU pulse channel 2
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; -----------------------------------------------------------------------------
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APUPULSE2CTRL = $4004
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APUPULSE2SWEEP = $4005
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APUPULSE2TIMERLO = $4006
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APUPULSE2TIMERHI = $4007
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; -----------------------------------------------------------------------------
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; APU triangle channel
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; -----------------------------------------------------------------------------
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APUTRIANGLECTRL = $4008
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APUTRIANGLETIMERLO = $400A
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APUTRIANGLETIMERHI = $400B
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; -----------------------------------------------------------------------------
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; APU noise channel
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; -----------------------------------------------------------------------------
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APUNOISECTRL = $400C
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APUNOISEPERIOD = $400E
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APUNOISELENGTH = $400F
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; -----------------------------------------------------------------------------
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; APU DMC channel
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; -----------------------------------------------------------------------------
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APUDMCCTRL = $4010
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APUDMCDIRECT = $4011
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APUDMCADDR = $4012
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APUDMCLENGTH = $4013
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; -----------------------------------------------------------------------------
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; APU status and frame counter
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;
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; $4015:
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; Write: enable or disable the five APU channels
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; Read: channel and interrupt status
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;
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; $4017:
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; Write: APU frame-counter mode and IRQ inhibit
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; Read: controller port 2
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; -----------------------------------------------------------------------------
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APUSTATUS = $4015
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APUFRAMECOUNTER = $4017
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; -----------------------------------------------------------------------------
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; Controller masks
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; -----------------------------------------------------------------------------
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PAD_RIGHT = $01
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PAD_LEFT = $02
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PAD_DOWN = $04
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PAD_UP = $08
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PAD_START = $10
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PAD_SELECT = $20
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PAD_B = $40
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PAD_A = $80
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PAD_HORIZONTAL = PAD_LEFT | PAD_RIGHT
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PAD_VERTICAL = PAD_UP | PAD_DOWN
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PAD_DPAD = PAD_HORIZONTAL | PAD_VERTICAL
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