File Structure

File Structure

genx-dos/
├── README.md                  one-page entry point
├── CHANGELOG.md
├── index.html                 fake BIOS POST → redirects to prompt/
├── favicon.ico
├── make_fonts.py              generates f12.N.png palette variants
│
├── prompt/                    the DOS terminal
│   ├── index.html
│   ├── favicon.ico
│   ├── animated_favicon1.gif
│   ├── javascript/
│   │   ├── globals.js         shared state (palette, paths, flags)
│   │   ├── goFontGo.js        builds the 256 CSS rules
│   │   ├── classUtils.js      add/remove/test class helpers
│   │   ├── keyboard.js        keypress / keydown handlers
│   │   ├── terminal.js        echo, executeBatch, prompt rendering
│   │   ├── fs.js              the virtual C: drive
│   │   ├── commands-core.js   handleCmd, dir, type, etc.
│   │   ├── commands.js        echo, cd, cls, setcol, easter eggs
│   │   └── init.js            entry point
│   └── img/
│       ├── f12.7.png          master sprite sheet (light grey)
│       └── f12.<0-15>.png     CGA palette variants
│
└── emulators/
    ├── jsbeeb/                BBC Micro       (copied from mattgodbolt/jsbeeb)
    ├── archimedes-live/       Acorn Archimedes (mirror of pdjstone/archimedes-live)
    ├── jsnes/                 NES             (copied from bfirsh/jsnes)
    ├── genesis/               Sega Genesis    (copied from lrusso/Genesis)
    ├── javatari/              Atari 2600      (copied from ppeccin/javatari.js)
    ├── jsdos/                 MS-DOS          (copied from caiiiycuk/js-dos)
    └── webmsx/                MSX/MSX2/MSX2+  (mirror of ppeccin/WebMSX)

Per-emulator layout

Emulator	Runtime	Wrapper	Game files
jsbeeb/	dist/ (Vite build)	the dist's own index.html (URL-driven)	dist/discs/<publisher>/*.ssd
archimedes-live/	mirrored static bundle (HTML/JS/WASM/data + ROMs)	the bundle's own index.html (hash-driven)	software/*.zip (catalogue: software/software.json); ROMs in emu/roms/
jsnes/	dist/jsnes.min.js	play.html	roms/*.nes
genesis/	Genesis.min.js	play.html	roms/*.bin
javatari/	javatari.js	play.html	roms/*.a26
jsdos/	js-dos.js + wdosbox.wasm	play.html	bundles/*.jsdos
webmsx/	single 5 MB index.html (engine + UI + BIOSes inlined)	the bundle's own index.html (URL-driven)	games/msx1/*.zip + games/msx2/*.zip

Each play.html-based emulator (NES, Genesis, Atari 2600, jsdos) also has a games.json mapping <key> → {title, rom} (or {title, bundle}). The URL-driven emulators (jsbeeb, archimedes-live, webmsx) take all their config via query string or hash and need no per-site wrapper.

Notes on individual files

File	Purpose
index.html	4-second BIOS POST animation, then <meta refresh> to prompt/
prompt/index.html	Loads the JS modules in order, hosts the terminal <div>
prompt/img/f12.7.png	192×192 px, 16×16 grid of 12×12 px CP437 glyphs (light grey)
prompt/img/f12.<N>.png	Pre-tinted variant for CGA palette index N
make_fonts.py	One-shot PIL script that tints f12.7.png into the other variants