tmerritt/disasm
1
0 Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

CDL re-trace: 1942 (JU) 46.6%, Galaga (U) 32.3% (Pass 2/3 complete)

Browse Source 
Pass 3 _wip: semantic ZP aliases for Sqoon (U) (FrameCounter, PpuCtrlShadow, NmiFrameFlag) and Elevator Action (U) (PpuCtrlShadow, NmiSaveA/X/Y)
Pass 3 Slalom (U): semantic ZP aliases (PpuCtrlShadow, PpuMaskShadow)
Pass 3 Kung Fu (U): semantic ZP alias (PpuCtrlShadow)
Pass 3 Othello (U): semantic ZP alias (PpuCtrlShadow)
Pass 3 1942 (JU): semantic ZP alias (PpuCtrlShadow)
Pass 3 Galaga (U): semantic ZP aliases (PpuCtrlShadow, PpuMaskShadow)
Docs: add power-on flow + data-table inventory to READMEs of 13 promoted NROM projects
Pass 3 Elevator Action (U): add NmiFrameFlag alias
Pass 3 Elevator Action (U): full ZP naming (23 aliases) + 25 named data tables, 59.4% coverage
Pass 1/2/3 re-trace: recover unreached code in 7 NROM projects (Sqoon 56.4%, Elevator Action 59.3%, Kung Fu 52.1%, 1942 52.1%)
Pass 3 Sqoon (U): full ZP naming (22 aliases) + 17 named data tables
Pass 3 Kung Fu (U): full ZP naming (21 aliases) + 13 named data tables
Pass 3 Othello (U): full ZP naming (18 aliases) + 27 named data tables
Pass 3 1942 (JU): full ZP naming (14 aliases) + 19 named data tables
Pass 3 Galaga (U): full ZP naming (15 aliases) + 14 named data tables
Pass 3 Slalom (U): full ZP naming (16 aliases) + 16 named data tables
Pass 2/3: re-apply naming to Slalom (U), Othello (U), Galaga (U) after re-seed
Pass 1/2/3 re-trace: recover unreached code in 6 more promoted NROM projects
Pass 3 Stack-Up (JU): full ZP naming (15 aliases) + 12 named data tables
Pass 3 Tag Team Wrestling (U): full ZP naming (20 aliases) + 11 named data tables
Pass 3 Kung Fu (U) (a1): full ZP naming (20 aliases) + 12 named data tables
Pass 3 Magmax (U): full ZP naming (18 aliases) + 6 named data tables
Pass 3 Soccer (JU): full ZP naming (18 aliases) + 9 named data tables
Pass 3 Ms Pac-Man (Namco) (U): full ZP naming (18 aliases) + 8 named data tables
Docs: refresh coverage numbers and data-table inventories for 13 promoted NROM projects
This commit is contained in:
tmerritt committed 2026-10-21 16:43:54 -04:00
1 parent 0a49ee6da7
commit 6740550ac0
55 files changed
+160669 -46941
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

NROM/Galaga (U)/README.md
+53 -47
View File
@@ -2,66 +2,72 @@
## Status
**Pass 3.** All address-derived `Label_XXXX` definitions replaced;
every `jsr`/`jmp` operand symbolic; hardware-register operands resolved
via `apply_symbols.py` (0 residue); audit comments aligned; `make`
stays byte-identical.
`make` assembles `header.s`, `prg.s`, `chr.s`, links them with `ld65` and compares the
result against `rom.nes`:
```
Byte-identical ROM verified.
```
**Pass 3 complete; promoted.** `prg.s` is a traced disassembly with all
address-derived labels replaced, all `jsr`/`jmp` operands symbolic, hardware
registers named via `symbols.inc`, and `apply_symbols.py` reporting 0 residue.
Code coverage: 11,319 / 32,768 bytes (34.5%).
`make` assembles and verifies byte-identical to `rom.nes`.
## ROM
| Property | Value |
|----------|-------|
| Format | iNES |
| Mapper | 0 |
| Board | NROM-256 |
| Mapper | 0 (NROM) |
| PRG | 32 KB |
| CHR | 8 KB |
| Mirroring | Horizontal |
| Four-screen VRAM | no |
| Battery | no |
| PRG | 32 KB (2 x 16 KB), mapped at CPU $8000-$FFFF |
| CHR | 8 KB (1 x 8 KB) |
| Trainer | none |
| Footer | none |
| NMI vector | $C0C8 |
| RESET vector | $C000 |
| IRQ vector | $C000 |
| ROM file | `Galaga (U).nes` |
| SHA-256 | `38f999bb2fa88893446d25a1885b0af1569f1260652d1c49332276c651315541` |
### Header notes
## Power-on flow
- none
RESET enters at `$C000`:
## Open work
sei ; CPU:$C000 PRG:4000 78
cld ; CPU:$C001 PRG:4001 D8
ldx #$00 ; CPU:$C002 PRG:4002 A2 00
stx PPUCTRL ; CPU:$C004 PRG:4004 8E 00 20
stx PPUMASK ; CPU:$C007 PRG:4007 8E 01 20
lda PPUSTATUS ; CPU:$C00A PRG:400A AD 02 20
bpl Reset_OnNonnegative ; CPU:$C00D PRG:400D 10 FB
ldx #$BF ; CPU:$C00F PRG:400F A2 BF
txs ; CPU:$C011 PRG:4011 9A
lda #$A5 ; CPU:$C012 PRG:4012 A9 A5
cmp ZpFF ; CPU:$C014 PRG:4014 C5 FF
bne Reset_Loop ; CPU:$C016 PRG:4016 D0 04
- **Pass 1** - run `nesdis.py` over `prg.bin` to produce the code/data
split. The tracer reads the vectors from the last six bytes of the PRG
image, so the split seeds correctly.
- **Pass 1** must emit the canonical audit comment
`; CPU:$C123 PRG:0123 AD 21 03` at column 35 for every instruction.
- **Pass 2** - replace the address-derived `Label_XXXX` names and the raw
`$XXXX` call operands.
- **Pass 3** - semantic zero-page aliases (applied only at the sites where
their role is proven) and named data tables.
- **Promotion** to `NROM/<name>/` once Pass 3 is done, as `git mv`.
NMI handler at `$C0C8`:
## Files
pha ; CPU:$C0C8 PRG:40C8 48
txa ; CPU:$C0C9 PRG:40C9 8A
pha ; CPU:$C0CA PRG:40CA 48
tya ; CPU:$C0CB PRG:40CB 98
pha ; CPU:$C0CC PRG:40CC 48
ldx Zp4A ; CPU:$C0CD PRG:40CD A6 4A
dex ; CPU:$C0CF PRG:40CF CA
bne NmiHandler_Loop ; CPU:$C0D0 PRG:40D0 D0 19
| File | Purpose |
|------|---------|
| `prg.s` | Pass 0 PRG include (replaced by the Pass 1 disassembly) |
| `header.s` | iNES header include |
| `chr.s` | CHR include |
| `prg.bin` | 32768 bytes (32 KB) PRG image |
| `chr.bin` | 8192 bytes (8 KB) CHR image |
| `rom.nes` | byte-identical copy of the original ROM |
| `linker.cfg` | HEADER / PRG / CHR memory areas |
| `symbols.inc` | NES hardware register names |
| `locals.inc` | zero-page aliases (empty at Pass 0) |
| `Makefile` | build and byte-identity check |
## Data-table inventory (Pass 3)
- `$8000-$BDFF` (15872 bytes) - `UnreachedRomData`
- `$BE59-$BFFF` (423 bytes) - `UnreachedRomData2`
- `$C480-$C49F` (32 bytes) - `SpriteHeightTable`
- `$CC32-$CC37` (6 bytes) - `SpriteSpawnOffsetTable`
- `$D816-$D819` (4 bytes) - `SpriteStarCountTable`
- `$D9CA-$D9CF` (6 bytes) - `SpriteMovementParameterTable`
- `$E0F3-$E112` (32 bytes) - `ExplosionGraphicTable`
- `$E1E8-$E1E8` (1 bytes) - `UnreachedByte`
- `$E69A-$E69A` (1 bytes) - `UnreachedByte2`
- `$E7B1-$E7B5` (5 bytes) - `SpriteScoreTable`
- `$E9AA-$EAD9` (304 bytes) - `SpriteAttributeTable`
- `$EC7B-$EC84` (10 bytes) - `LevelStarPointerTable`
- `$ED8E-$F78F` (2562 bytes) - `LevelGraphicData`
- `$F7B4-$FFFF` (2124 bytes) - `SpriteGraphicData`
## Build
```
Byte-identical ROM verified.
```