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# fixGB - RetroBIOS

Type | libretro
Classification | official_port
Source | https://github.com/libretro/fixGB
Upstream | https://github.com/FIX94/fixGB
Version | Alpha v0.8.2
Profiled | 2026-03-23
Cores | fixgb
Systems | nintendo-gbc

Technical notes

Game Boy / Game Boy Color emulator by FIX94. Supports .gb, .gbc, and .gbs (Game Boy Sound) files. FIX94 maintains both standalone and libretro versions in the same upstream repo.

Optionally loads gbc_bios.bin from the system directory. Validates file size (>= 0x900 bytes), reads the first 0x900 bytes into memCGBBootrom[], sets cgbBootromEnabled. Enables the GBC startup animation and palette selection for DMG games.

Without the boot ROM, the core skips the boot sequence and starts games directly. No DMG boot ROM support in the source.

1 files | 0 required, 1 optional | 1 in repo, 0 missing | 1 with HLE fallback

`gbc_bios.bin` -optional, HLE available : Game Boy Color (CGB-001) boot ROM

- System: nintendo-gbc
- Size: 2.2 KB
- SHA1: `1293d68bf9643bc4f36954c1e80e38f39864528d`
- MD5: `dbfce9db9deaa2567f6a84fde55f9680`
- Validation: size
- Source: `libretro/libretro.c:246-254 (doOpenCGBBootrom), mem.c:567-586 (memInitCGBBootrom)`
- Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
- Minimum 0x900 (2304) bytes. Only first 0x900 bytes read. Disabled via memDisableCGBBootrom() on register write.

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