emux (Game Boy) - RetroBIOS

Type	libretro
Classification	Official ports
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, controllers/mapper/gb_mapper.c:32) to dmg_boot.bin (libretro, controllers/mapper/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 (controllers/mapper/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, controllers/mapper/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 in repo
Game Boy (DMG) boot ROM

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

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