tmerritt
1b0682042f
- 3,058 instructions (37.5% code), 48 semantic labels, 174 zero-page aliases - BYTE-IDENTICAL build verified - Key routines: Reset, NmiHandler, MainGameLoop, GameModeDispatcher, InitPPU, InitVariables, UpdateController, UpdateSprites - Zero-page aliases: PPUCtrlShadow (/bin/bash8), PPUMaskShadow (/bin/bash9), GameMode (4), RoundIndex (6), DispatchIndex (A) - Root OVERVIEW.md updated to reflect Pass 2 completion and correct mirroring (Horizontal)
68 lines
3.4 KiB
Markdown
68 lines
3.4 KiB
Markdown
# Duck Hunt (JUE) — Pass 2 Complete
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ROM: `_wip/Duck Hunt (JUE)/Duck Hunt (JUE).nes` (24,592 bytes, iNES). Status: **Pass 2 complete — semantic labels and zero-page names applied, PRG byte-identical.** `copilot/prg.s` contains a classified disassembly with 3,058 instructions (37.5% code), 48 semantic labels, and 174 zero-page semantic aliases. The build is **BYTE-IDENTICAL** at the PRG level.
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## ROM Facts
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| Property | Value |
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|----------|-------|
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| Mapper | 0 (NROM) — from the iNES header |
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| PRG | 16 KB (header claims map at CPU $C000–$FFFF) |
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| CHR | 8 KB |
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| Mirroring | Horizontal |
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| Battery-backed flag | clear |
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| ROM SHA-256 | `ca0d31e6f3aa70204fa5af67803c6533851a28fa48a133e15d772d3667fa675a` |
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| PRG SHA-256 | `bcdd22fbe343ebd33c7fd19309510079150d1e4dc052f65382b64d197d6ba080` |
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## Interrupt Vectors (taken from PRG $3FFA–$3FFF)
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| Vector | Target | Note |
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|--------|--------|------|
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| NMI | `$C086` | per-frame heartbeat |
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| RESET | `$C000` | cold start at $C000 — the usual pattern in this repo |
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| IRQ | `$C000` | redirects to RESET — unused placeholder |
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## `copilot/` Contents
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| File | Purpose |
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|------|---------|
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| `Duck Hunt (JUE).nes` | original ROM image (reference) |
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| `prg.bin` / `header.bin` / `chr.bin` | split image, produced by `_tools/splitnes.py` |
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| `prg.s` | Pass 1/2: classified code/data split, 3,058 instructions, 48 semantic labels, audit comments on every emission |
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| `symbols.inc` | shared NES hardware constants (PPU/APU/controller, from the skeleton) |
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| `locals.inc` | 174 zero-page semantic aliases (filled in by Pass 2) |
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| `linker.cfg` | PRG at $C000, 16 KB, `fill = yes` |
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| `Makefile` | links `reconstructed_prg.bin` and `cmp`s it against `prg.bin` |
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| `reconstructed_prg.bin` | build output from the last verified build |
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Header/CHR are reproduced verbatim from `header.bin`/`chr.bin` (not linked): `make` verifies **PRG bytes only** at this stage. When this project is promoted to a full disassembly, `header.s` / `chr.s` (as e.g. `Burger Time (U)`) and a full-ROM `make` target get added.
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## Build
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```bash
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cd "_wip/Duck Hunt (JUE)/copilot"
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make # → cmp reconstructed_prg.bin prg.bin → "BYTE-IDENTICAL"
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```
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## Next Steps (per `PROMPTS.md`)
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1. **Pass 3** — name data tables/structures; release provisional flags.
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2. **Promotion** — move to a top-level `<name>/copilot/` folder, add full-ROM build (header.s + chr.s + vectors), and write the power-on flow `OVERVIEW.md` in the established style; then it joins the root index's numbered inventory.
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## Pass 2 Details (2026-10-18)
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- **Label renaming**: 48 of 472 labels renamed to semantic names using `pass2.py apply` with a mapping file (`duckhunt_label_map.tsv` + `locals.inc` for zero-page). Key renamed routines:
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- RESET/NMI: `Reset`, `NmiHandler`
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- System init: `Reset`, `WaitVBlank`, `ClearZeropage`, `InitGameState`, `InitPPU`, `InitVariables`
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- Main loop: `MainGameLoop`, `GameModeCheck`, `GameplayFrame`, `GameModeDispatcher`, `TitleScreenMode`
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- NMI: `NmiHandler`, `NmiFrameEnd`
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- Controller: `UpdateController`
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- Sprites: `UpdateSprites`
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- Sound: `InitSound`
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- **Zero-page semantic aliases**: 174 aliases in `locals.inc` (see `locals.inc` header for full list):
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- PPU: `PPUCtrlShadow` ($08), `PPUMaskShadow` ($09)
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- Game state: `GameMode` ($24), `RoundIndex` ($26), `DispatchIndex` ($2A)
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- Player arrays: `PlayerState` ($16), `PlayerInput` ($25), `PlayerData` ($2A)
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- Pointers: `TempPtrLo` ($00), `TempPtrHi` ($01)
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