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Boytacean - RetroBIOS
Type standalone + libretro
Classification official_port
Source https://github.com/joamag/boytacean
Version 0.11.5
Profiled 2026-03-23
Cores boytacean
Systems nintendo-gb, nintendo-gbc
Technical notes

Game Boy / Game Boy Color emulator written in Rust by Joao Magalhaes.

Libretro: all boot ROMs compiled into binary as static byte arrays in src/data.rs. load_boot_static() copies from arrays. No filesystem access, no RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY. No external files. ref: core.rs:402 instance.load(true) -> gb.rs:1311 -> load_boot_static

Standalone (SDL): also defaults to embedded boot ROMs via load(true). User can override via --boot-rom-path CLI argument with any boot ROM file. load_boot_file() with hardcoded ./res/boot/*.bin paths exists in gb.rs:1361 but is not called from any frontend.

Boot ROM defaults: DmgBootix (DMG), CgbBoytacean (CGB) — open-source.

6 files | 0 required, 6 optional | 3 in repo, 3 missing | 6 with HLE fallback

dmg_boot.bin -optional, HLE available, standalone

sgb_boot.bin -optional, HLE available, standalone

dmg_bootix.bin -optional, HLE available, standalone, missing from repo

  • System: nintendo-gb
  • Size: 256 B
  • Source: gb.rs:1352 load_boot_static, data.rs:44 DMG_BOOTIX
  • Open-source DMG boot ROM from Bootix (default DMG)

mgb_bootix.bin -optional, HLE available, standalone, missing from repo

  • System: nintendo-gb
  • Size: 256 B
  • Source: gb.rs:1353 load_boot_static, data.rs:59 MGB_BOOTIX
  • Open-source MGB (Pocket) boot ROM from Bootix

cgb_boot.bin -optional, HLE available, standalone

cgb_boytacean.bin -optional, HLE available, standalone, missing from repo

  • System: nintendo-gbc
  • Size: 2.2 KB
  • Source: gb.rs:1355 load_boot_static, data.rs:177 CGB_BOYTACEAN
  • Custom open-source CGB boot ROM (default CGB)

Generated on 2026-03-25T14:56:43Z