# Bundled runtime sources

EmulatorJS frontend **4.2.3**, GPL-3.0-or-later. Upstream JavaScript and CSS are unmodified.

- Source: <https://github.com/EmulatorJS/EmulatorJS/tree/v4.2.3>
- Runtime: <https://cdn.emulatorjs.org/4.2.3/data/emulator.min.js>
- Style: <https://cdn.emulatorjs.org/4.2.3/data/emulator.min.css>
- Decompressor: <https://cdn.emulatorjs.org/4.2.3/data/compression/extract7z.js>
- License: [vendor/LICENSE.EmulatorJS](vendor/LICENSE.EmulatorJS)

Genesis Plus GX core, legacy WebAssembly build from **@kreijstal/emulatorjs 4.2.3-build.1**. The archive includes its build metadata, original license text, JavaScript and WASM. `runtime-data.js` base64-encodes the unmodified replacement archive and a source-built 7z extraction helper.

- Publisher's build package: <https://www.npmjs.com/package/@kreijstal/emulatorjs/v/4.2.3-build.1>
- Source snapshots, build scripts and patches: </sources/emulatorjs-sources-4.2.3-build1.zip>
- Core source revision: <https://github.com/EmulatorJS/Genesis-Plus-GX/tree/594cdf3a666546f65f46391c3615ac5e9550bfc1>
- Original source: <https://github.com/ekeeke/Genesis-Plus-GX>
- Exact archive license: [vendor/LICENSE.Core-Archive](vendor/LICENSE.Core-Archive), extracted from the bundled archive's `license.txt`.
- Current upstream license and component notices: [vendor/LICENSE.Genesis-Plus-GX](vendor/LICENSE.Genesis-Plus-GX).

The runtime manifest records exact byte sizes and SHA-256 hashes. Genesis Plus GX's license restricts commercial use; review its included license for the terms. The site retains the 4.2.3 frontend, while the replacement core is a separately documented build.

No third-party commercial games, console BIOS images or copyrighted cartridge artwork are bundled. Pyro is the user's homebrew cartridge. The room background was generated for this project with imagegen; see [the saved prompt](assets/artwork-prompt.txt).

## Sound Workshop chip audition

The workshop uses the YM2612 (ymfm) and Sega PSG WebAssembly cores and low-level wrappers from **tetorica-fm2612 0.2.28**, BSD-3-Clause. Only these two cores are included; it does not load the package's other chips, sample data, or browser application.

- Published source/package: <https://registry.npmjs.org/tetorica-fm2612/-/tetorica-fm2612-0.2.28.tgz>
- Upstream source: <https://github.com/kyorohiro/hello_ymfm_wasm>, <https://github.com/aaronsgiles/ymfm>
- Included license: [vendor/sound-chips/LICENSE](vendor/sound-chips/LICENSE).
- Original loader, wrapper and WASM bytes plus their hashes: [vendor/sound-chips/manifest.json](vendor/sound-chips/manifest.json).

`tools/package-sound-chips.mjs` packages the cores, model, renderer and worker into `vendor/sound-chip-worker.js` for offline file-mode use. The ESM loader/wrapper syntax is adapted into a worker bundle; the native WASM bytes are unchanged. The loader receives embedded WASM bytes, so its placeholder base URL is never fetched. The npm archive's pinned SHA-512 integrity is verified before packaging. To regenerate, extract that package into `genesis-room/build/sound-chip/package/` with the original `package.tgz` beside it, then run `node genesis-room/tools/package-sound-chips.mjs`.

The audition's register schedule and chip mix are local project code in `sound-renderer.js`. PSG gain is calibrated to the player's Genesis Plus GX defaults (2800-step output, 150% preamp); monitoring gain is separate. This is chip emulation rather than an oscillator approximation, but it does not claim sample-identical output across console models and emulator filtering settings.