DeSmuME - RetroBIOS

Type	libretro
Classification	Community forks
Source	https://github.com/libretro/desmume
Upstream	https://github.com/TASEmulators/desmume
Version	SVN
Profiled	2026-03-23
Cores	desmume
Systems	nintendo-ds

Technical notes

Full HLE of ARM7/ARM9 SWI routines; BIOS files optional for most games. External BIOS enables SWI-from-BIOS mode. Firmware boot requires both BIOS files loaded and interpreter mode (JIT incompatible). No DSi support. Core option: desmume_use_external_bios.

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

bios7.bin optional in repo HLE fallback
ARM7 BIOS

• System: nintendo-ds
• Size: 16.0 KB
• Validation: size
• Source: desmume/src/NDSSystem.cpp:2178-2182, frontend/libretro/libretro.cpp:763
• Platforms: batocera, emudeck, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
• Native file needed for firmware boot and SWI-from-BIOS accuracy

bios9.bin optional in repo HLE fallback
ARM9 BIOS

• System: nintendo-ds
• Size: 4.0 KB
• Validation: size
• Source: desmume/src/NDSSystem.cpp:2236-2239, frontend/libretro/libretro.cpp:764
• Platforms: batocera, emudeck, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
• Native file needed for firmware boot and logo comparison (Pal Park)

firmware.bin optional in repo HLE fallback
NDS firmware image

• System: nintendo-ds
• Source: desmume/src/firmware.cpp:249-280, frontend/libretro/libretro.cpp:765
• Platforms: batocera, emudeck, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
• Loaded only if both BIOS files present; needed for boot animation, wifi config, user settings

Generated on 2026-04-18T08:05:07Z