Boytacean - RetroBIOS

Type	standalone + libretro
Classification	Official ports
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: frontends/libretro/src/core.rs:402 instance.load(true) -> src/gb.rs:1361 -> 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 src/gb.rs:1411 but is not called from any frontend.

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

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

dmg_boot.bin optional in repo HLE fallback standalone

• System: nintendo-gb
• Size: 256 B
• Source: src/gb.rs:1450, src/data.rs:14
• Platforms: lakka, recalbox, retroarch, retropie, romm
• Original Nintendo DMG boot ROM

sgb_boot.bin optional in repo HLE fallback standalone

• System: nintendo-gb
• Size: 256 B
• Source: src/gb.rs:1451, src/data.rs:29
• Platforms: batocera, lakka, recalbox, retroarch, retrobat, retropie
• Super Game Boy boot ROM

dmg_bootix.bin optional in repo HLE fallback standalone

• System: nintendo-gb
• Size: 256 B
• Source: src/gb.rs:1452, src/data.rs:44
• Open-source DMG boot ROM from Bootix (default DMG)

mgb_bootix.bin optional in repo HLE fallback standalone

• System: nintendo-gb
• Size: 256 B
• Source: src/gb.rs:1453, src/data.rs:59
• Open-source MGB (Pocket) boot ROM from Bootix

cgb_boot.bin optional in repo HLE fallback standalone

• System: nintendo-gbc
• Size: 2.2 KB
• Source: src/gb.rs:1354, src/data.rs:74
• Platforms: lakka, recalbox, retroarch, retropie, romm
• Original Nintendo CGB boot ROM

cgb_boytacean.bin optional in repo HLE fallback standalone

• System: nintendo-gbc
• Size: 2.2 KB
• Source: src/gb.rs:1418, src/data.rs:177
• Custom open-source CGB boot ROM (default CGB)

Generated on 2026-09-14T09:03:09Z