aa3da00bfa
Reverse-engineering + open reimplementation workspace for Eushully's AGE/SYS4 engine (first target: Himegari). The repo root is age-reimpl/; the original game install and the extracted ALF data are siblings outside the repo and are never tracked. build/ (derived corpora) is gitignored and regenerated by the tools. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
111 lines
5.4 KiB
Markdown
111 lines
5.4 KiB
Markdown
# DATA1 Script Inventory — 481 `.BIN` files
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All scripts share the magic header `SYS4422 ` (8 bytes), confirming a uniform SYS4
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bytecode format (engine version 4.4.2.2) across the entire set. Header is followed
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by what appear to be little-endian u32 fields (version/section table — to be mapped
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during disassembler work).
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Source: `extracted\DATA1\` (extracted from `DATA1.ALF`).
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**Patch overrides:** 52 loose `.BIN` files sit in the game root directory and shadow
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their DATA1 counterparts at runtime (sizes differ slightly — e.g. `FIELD.BIN` root
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200,536 vs archive 200,224). These are the v1.03 / append-patch versions and should be
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treated as **authoritative** over the archive copies. Two engine files exist only in
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the root: `SYS4INI.BIN` (272 KB) and `SYS4AB.BIN` (1.08 MB).
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---
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## Breakdown by series
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| Series | Count | Total size | Role (inferred) |
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|---|---|---|---|
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| `SC####` | 136 | 15.6 MB | Scenario/event scripts (numbered 0000–1690, step 10) |
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| `SP####` | 163 | 10.6 MB | Secondary scene series (0010–1369; incl. `SP0051A/B` split) — likely character/H-events |
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| Named scripts | 175 | ~7.5 MB | Engine subsystems, data tables, UI, battle logic |
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| `DEBUG*` | 5 | 1.4 MB | Debug tools (`DEBUGADV.BIN` alone is 1.4 MB — a scene viewer/jump menu) |
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| `RTN_M###` / `RTN_B###` | 26 | ~70 KB | Small routine scripts (map routines M001–M061, battle routines B001–B004) |
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### SC series notes
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- Numbered `SC0000`–`SC0880` (main chapters, largest files — up to 700 KB) and
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`SC1000`–`SC1690` (smaller; likely sub-events, endings, appendix content).
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- `SCJUMP.BIN` (778 KB) is almost certainly the master scene-dispatch/jump table.
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- `SCINIT.BIN` (88 KB) initializes scenario state.
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---
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## Named scripts by subsystem (inferred from names)
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### Engine core / boot flow
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`SYSTEM4.BIN` (config root), `INIT.BIN` (64 bytes — smallest script, ideal first
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disassembly target), `INITCONFIG`, `LOADCONFIG`, `CONFIG`, `TUNE`, `LOGO`, `OP`,
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`ED`, `TITLE`, `GAMESTART`, `GAMECLEAR`, `STAGECLEAR`
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### Data-table INIT scripts (likely static game data, not logic)
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Large, table-like scripts — prime candidates for data extraction:
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- `STINIT` (579 KB) — stages/scenario tables
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- `EBINIT` (338 KB) — enemy battle data
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- `MPINIT` (330 KB) — maps
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- `SCINIT` (88 KB), `CGINIT` (79 KB — CG gallery), `ITINIT` (70 KB — items),
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`RTINIT` (67 KB), `CCINIT` (41 KB), `SKINIT` (37 KB — skills), `CDINIT` (31 KB),
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`BTANINIT` (105 KB — battle animations)
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- Smaller: `AFINIT`, `ALINIT`, `CIINIT`, `CNINIT`, `CTINIT`, `CVINIT`, `ILINIT`,
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`LAINIT`, `MAINIT`, `OBINIT`, `SPINIT`, `TRINIT`, `VIINIT`
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### Message/string tables (`*MES`)
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`ITMES` (64 KB — item text), `VIMES` (43 KB), `EIMES` (37 KB), `SKMES` (31 KB — skill
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text), `CIMES` (15 KB), `MAMES`, `INFOMES`, `MES` — where most translatable text
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outside scenes lives.
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### Battle system
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`BTL` (61 KB — main battle loop), `BTRTN`, `ROUND`, `AIM`, `ATSEEK`, `MVSEEK`,
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`MVRTN`, `MAGIC`, `USEMAGIC`, `SUMMON`, `EXILE`, `DISARM`, `RECOVER`, `COUNTUNIT`,
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`SETOCC`, and the `CALC*` family: `CALCBTPARAM`, `CALCDMG` (16 KB — damage formula!),
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`CALCSCOPE`, `CALCOCC`, `CALCREVISE`, `CALCCC`, `CALCILL`, `CALCARR`
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### Dungeon/map engine
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`FIELD` (200 KB — the core dungeon-crawl loop), `DRAWMAP`, `RENDERMAP`,
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`DRAWMINIMAP`, `DRAWCH`/`DRAWCHP`/`DRAWENP`/`DRAWOBJ`/`DRAWTIP`/`DRAWVOL`,
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`SETCH`/`SETEN`/`SETLAND`/`SETOBJ`/`SETROUTE`/`SETMVWORK`,
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`DELCH`/`DELEN`/`DELENMASS`/`DELLAND`, `RESETLAND`, `WARPU`/`WARPD`, `LOOK`,
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`READICON`
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### Unit/party management
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`ADDEXP`, `ADDSKILL`, `ADDEN`, `ADDITEM`, `ADDRANDOMITEM`, `LOSTRANDOMITEM`,
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`ADDILL`/`ADDILLSUB`, `EVOLVE`, `IMPROVE` (37 KB), `TRAIN`, `STUDY`, `UNITECH`,
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`REMOVECH`, `SHOWGROW`, `STATUS`, `USEITEM`, `SETCH`
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### Base/facility gameplay
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`CAMP`, `ROOM`, `FORT`, `ALCHEMY` (40 KB), `SALLY` (40 KB — sortie/deployment),
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`READY` (39 KB — pre-battle prep), `SELSTAGE` (34 KB), `SELACT` (30 KB)
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### Menus / UI / meta
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`MENU`, `CHMENU` (69 KB — character menu), `INFO`/`INFOAF`/`INFOCH`/`INFOEN`/
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`INFOIT`/`INFOVO` (info panels: characters, enemies, items, voices), `SAVE` (40 KB),
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`HISTORY`, `HIDEWIN`, `CLOSE`, `INPUTNAME` (28 KB), `CGMODE` (24 KB — gallery),
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`MMODE` (music mode), `HMODE` (22 KB — scene replay)
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### Flow control / branching
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`BUNKI` (分岐 = branch, 15 KB), `SBUNKI`, `BUNKIMOVE`, `SBUNKIMOVE`, `SCJUMP`
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### Callbacks (engine → script hooks)
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`CALLBACK_LOAD`, `CALLBACK_LOST`, `CALLBACK_SETTING`, `CALLBACK_WINDOW`
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### Debug
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`DEBUG`, `DEBUGADV` (1.4 MB), `DEBUGANIME`, `DEBUGBTL`, `DEBUGMAP` (+2 numbered)
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---
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## Implications for the port
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1. **Much more game logic lives in bytecode than expected.** Damage formulas
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(`CALCDMG`), the dungeon loop (`FIELD`), battle flow (`BTL`, `ROUND`), and unit
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progression (`ADDEXP`, `EVOLVE`) are all scripts — `AGE.EXE` is closer to a pure
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VM/renderer. This strengthens the case for **re-implementing the AGE VM in Godot**
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rather than transpiling every script by hand (the doc's open question #12).
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2. **Disassembler bootstrapping order** (small → large, system → scene):
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`INIT.BIN` (64 B) → `ED.BIN`/`OP.BIN`/`LOGO.BIN` (~230 B) → `CALLBACK_LOST`
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(176 B) → `MENU.BIN` (3 KB) → `CALCDMG` → a mid-size `SC####`.
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3. **The `*INIT` giants are likely data tables**, decodable early even with a
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partial opcode map — instant win for extracting item/skill/enemy/stage databases.
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4. **Use root-directory overrides, not archive copies**, for the 52 patched scripts.
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