tmerritt
6740550ac0
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
79 lines
3.0 KiB
Markdown
79 lines
3.0 KiB
Markdown
# 1942 (JU)
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## Status
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**Pass 3 complete; promoted.** `prg.s` is a traced disassembly with all
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address-derived labels replaced, all `jsr`/`jmp` operands symbolic, hardware
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registers named via `symbols.inc`, and `apply_symbols.py` reporting 0 residue.
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Code coverage: 17,065 / 32,768 bytes (52.1%).
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`make` assembles and verifies byte-identical to `rom.nes`.
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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 (NROM) |
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| PRG | 32 KB |
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| CHR | 8 KB |
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| Mirroring | Horizontal |
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| NMI vector | $C030 |
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| RESET vector | $BF90 |
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| IRQ vector | $BF90 |
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## Power-on flow
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RESET enters at `$BF90`:
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sei ; CPU:$BF90 PRG:3F90 78
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cld ; CPU:$BF91 PRG:3F91 D8
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ldx #$F3 ; CPU:$BF92 PRG:3F92 A2 F3
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txs ; CPU:$BF94 PRG:3F94 9A
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lda #$10 ; CPU:$BF95 PRG:3F95 A9 10
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sta PPUCTRL ; CPU:$BF97 PRG:3F97 8D 00 20
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lda PPUSTATUS ; CPU:$BF9A PRG:3F9A AD 02 20
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bpl Reset_OnNonnegative ; CPU:$BF9D PRG:3F9D 10 FB
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lda $07BD ; CPU:$BF9F PRG:3F9F AD BD 07
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cmp #$55 ; CPU:$BFA2 PRG:3FA2 C9 55
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bne Reset_Loop ; CPU:$BFA4 PRG:3FA4 D0 07
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lda $07BE ; CPU:$BFA6 PRG:3FA6 AD BE 07
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NMI handler at `$C030`:
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sta Zp63 ; CPU:$C030 PRG:4030 85 63
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stx Zp64 ; CPU:$C032 PRG:4032 86 64
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sty Zp65 ; CPU:$C034 PRG:4034 84 65
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lda PpuCtrlShadow ; CPU:$C036 PRG:4036 A5 8C
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and #$7F ; CPU:$C038 PRG:4038 29 7F
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sta PPUCTRL ; CPU:$C03A PRG:403A 8D 00 20
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sta PpuCtrlShadow ; CPU:$C03D PRG:403D 85 8C
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lda #$00 ; CPU:$C03F PRG:403F A9 00
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## Data-table inventory (Pass 3)
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- `$8494-$9FDA` (6983 bytes) - `LevelLayoutData`
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- `$A08C-$A093` (8 bytes) - `PpuBitMaskTable`
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- `$A2F2-$A311` (32 bytes) - `EnemyHandlerPointerTable`
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- `$A3E2-$A73D` (860 bytes) - `LevelObjectSpawnTable`
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- `$A770-$A815` (166 bytes) - `EnemySpritePatternTable`
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- `$ABD0-$AC13` (68 bytes) - `EnemyHealthPointTable`
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- `$AD99-$ADC8` (48 bytes) - `SpriteOamAttributeTable`
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- `$B200-$B37A` (379 bytes) - `LevelTilemapData`
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- `$B4DC-$B4DF` (4 bytes) - `PlayerScoreTable`
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- `$B783-$B7C2` (64 bytes) - `EnemySpritePatternTable2`
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- `$B9C5-$B9E4` (32 bytes) - `BoardBoundaryData`
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- `$BB51-$BC85` (309 bytes) - `LevelGraphicData`
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- `$BF0F-$BF57` (73 bytes) - `EnemyMovementDeltaTable`
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- `$C366-$C3C9` (100 bytes) - `SpriteOamEntryTable`
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- `$DF58-$DF7F` (40 bytes) - `EnemySpawnCoordinateTable`
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- `$DFBE-$DFE5` (40 bytes) - `EnemySpawnCoordinateTable2`
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- `$E19E-$E1DF` (66 bytes) - `EnemyMovementPatternTable`
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- `$E24B-$E392` (328 bytes) - `EnemySpritePositionTable`
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- `$E3A1-$EC0B` (2155 bytes) - `EnemyHandlerCodeTable`
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## Build
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```
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Byte-identical ROM verified.
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```
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