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

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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
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NROM/Sqoon (U)/README.md
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## 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: 18,471 / 32,768 bytes (56.4%).
`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 | Vertical |
| 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 | $8014 |
| RESET vector | $8000 |
| IRQ vector | $80F1 |
| ROM file | `Sqoon (U).nes` |
| SHA-256 | `a31def038dbf46af939474dc3ec6ec76f87fc5b9057dc8c0d240953cd88cdef5` |
### Header notes
## Power-on flow
- none
RESET enters at `$8000`:
## Open work
ldx #$FF ; CPU:$8000 PRG:0000 A2 FF
txs ; CPU:$8002 PRG:0002 9A
stx NmiFrameFlag ; CPU:$8003 PRG:0003 86 FE
jsr Sub_82B2 ; CPU:$8005 PRG:0005 20 B2 82
jsr Sub_817B ; CPU:$8008 PRG:0008 20 7B 81
lda #$00 ; CPU:$800B PRG:000B A9 00
sta NmiFrameFlag ; CPU:$800D PRG:000D 85 FE
sta Zp9A ; CPU:$800F PRG:000F 85 9A
jmp Sub_80EE ; CPU:$8011 PRG:0011 4C EE 80
pha ; CPU:$8014 PRG:0014 48
lda NmiFrameFlag ; CPU:$8015 PRG:0015 A5 FE
beq NmiHandler_Loop ; CPU:$8017 PRG:0017 F0 03
- **Pass 1** - run `nesdis.py` over `prg.bin` to produce the code/data
split. The tracer reads the vectors from the last six bytes of the PRG
image, so the split seeds correctly.
- **Pass 1** must emit the canonical audit comment
`; CPU:$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 `$8014`:
## Files
pha ; CPU:$8014 PRG:0014 48
lda NmiFrameFlag ; CPU:$8015 PRG:0015 A5 FE
beq NmiHandler_Loop ; CPU:$8017 PRG:0017 F0 03
jmp IrqHandler ; CPU:$8019 PRG:0019 4C F1 80
inc NmiFrameFlag ; CPU:$801C PRG:001C E6 FE
inc FrameCounter ; CPU:$801E PRG:001E E6 54
jsr Sub_8158 ; CPU:$8020 PRG:0020 20 58 81
lda PpuCtrlShadow ; CPU:$8023 PRG:0023 A5 1D
| 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)
- `$833A-$83A2` (105 bytes) - `EnemyAnimationScriptTable`
- `$83C2-$83D3` (18 bytes) - `RoutinePointerTable`
- `$84A0-$84AF` (16 bytes) - `EnemyPathDeltaTable`
- `$85F3-$8606` (20 bytes) - `GameOverText`
- `$8690-$86A9` (26 bytes) - `EnemyGraphicTileIndexTable`
- `$8814-$8825` (18 bytes) - `LevelObjectDefinitionTable`
- `$8AB4-$8AD7` (36 bytes) - `EnemyTileIndexTable`
- `$8B48-$8B55` (14 bytes) - `PhaseLeftText`
- `$8BBD-$8BC7` (11 bytes) - `LevelStartParameterTable`
- `$8C41-$8C60` (32 bytes) - `EnemyMovementParameterTable`
- `$B5D5-$B5DD` (9 bytes) - `HomeDataText`
- `$BB39-$DC18` (8416 bytes) - `LevelGraphicData`
- `$DC6E-$DC8A` (29 bytes) - `EnemySpeedParameterTable`
- `$DD1A-$E08A` (881 bytes) - `SpriteGraphicData`
- `$E134-$E238` (261 bytes) - `EnemyHandlerPointerTable`
- `$E4B7-$F5D3` (4381 bytes) - `LevelCollisionData`
- `$FFE8-$FFFF` (24 bytes) - `VectorTable`
## Build
```
Byte-identical ROM verified.
```