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# emux (Game Boy) - RetroBIOS

Type | libretro
Classification | official_port
Source | https://github.com/libretro/emux
Upstream | https://github.com/sronsse/emux
Version | 0.1
Profiled | 2026-03-23
Cores | emux_gb
Systems | nintendo-gb

Technical notes

emux is a multi-system emulator by Sebastien Ronsse. The libretro port renamed the boot ROM from DMG_ROM.bin (upstream, gb_mapper.c:32) to dmg_boot.bin (libretro, gb_mapper.c:35) to match RetroArch conventions.

Boot ROM loaded via file_map(PATH_SYSTEM, "dmg_boot.bin", 0, 256) in gb_mapper_init (gb_mapper.c:225-228). Returns false on failure — no HLE fallback. Mapped at 0x0000-0x00FF, overlays ROM0 until BOOT_LOCK (0xFF50) is written non-zero (lock_writeb, gb_mapper.c:97-106).

No hash validation. Code accepts any 256+ byte file. is_experimental=true. No save states, rewind, or netplay.

1 files | 1 required, 0 optional | 1 in repo, 0 missing

`dmg_boot.bin` -required : Game Boy (DMG) boot ROM

- System: nintendo-gb
- Size: 256 B
- Aliases: `DMG_ROM.bin`
- Source: `controllers/mapper/gb_mapper.c:35 (bootrom_path), gb_mapper.h:13 (BOOTROM_SIZE=256), gb_mapper.c:225-232 (file_map + error)`
- Platforms: lakka, recalbox, retroarch, retropie
- Upstream name DMG_ROM.bin, renamed by libretro port (gb_mapper.c:33-34).

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