mesen-s - RetroBIOS¶
| Type | libretro |
| Classification | official_port |
| Source | https://github.com/libretro/Mesen-S |
| Upstream | https://github.com/SourMesen/Mesen-S |
| Version | 0.4.0 |
| Profiled | 2026-03-24 |
| Cores | mesen-s |
| Systems | nintendo-snes, nintendo-gb, nintendo-gbc, nintendo-super-game-boy, nintendo-satellaview |
Technical notes
High-accuracy SNES/SFC emulator with Game Boy/Color and Super Game Boy support. Upstream archived at 0.4.0, superseded by Mesen2. DSP firmware can be loaded as combined files (dsp1.rom, dsp1b.rom, dsp2.rom, dsp3.rom, dsp4.rom, st010.rom, st011.rom) or split program/data ROMs. Combined files are tried first, size validated. HLE coprocessor option available for DSP-1/DSP-1B only (libretro core option mesen-s_hle_coprocessor). CX4 is fully HLE, no firmware needed. ST018 detected but not emulated. GB/GBC/SGB boot ROMs fall back to embedded open-source SameBoy boot ROMs when external files are not found.
21 files | 0 required, 21 optional | 21 in repo, 0 missing | 8 with HLE fallback
dsp1.program.rom -optional, HLE available
- Size: 6.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:95, Core/FirmwareHelper.h:17-35 - Platforms: lakka, retroarch, retropie
- DSP-1 program ROM. HLE fallback in libretro port only
dsp1.data.rom -optional, HLE available
- Size: 2.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:95, Core/FirmwareHelper.h:17-35 - Platforms: lakka, retroarch, retrodeck, retropie
- DSP-1 data ROM
dsp1b.program.rom -optional, HLE available
- Size: 6.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:96 - Platforms: lakka, retroarch, retrodeck, retropie
- DSP-1B program ROM. HLE fallback in libretro port only
dsp1b.data.rom -optional, HLE available
- Size: 2.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:96 - Platforms: lakka, retroarch, retrodeck, retropie
- DSP-1B data ROM
dsp2.program.rom -optional
- Size: 6.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:97 - Platforms: lakka, retroarch, retrodeck, retropie
- DSP-2 program ROM
dsp2.data.rom -optional
- Size: 2.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:97 - Platforms: lakka, retroarch, retrodeck, retropie
- DSP-2 data ROM
dsp3.program.rom -optional
- Size: 6.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:98 - Platforms: lakka, retroarch, retrodeck, retropie
- DSP-3 program ROM
dsp3.data.rom -optional
- Size: 2.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:98 - Platforms: lakka, retroarch, retrodeck, retropie
- DSP-3 data ROM
dsp4.program.rom -optional
- Size: 6.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:99 - Platforms: lakka, retroarch, retrodeck, retropie
- DSP-4 program ROM
dsp4.data.rom -optional
- Size: 2.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:99 - Platforms: lakka, retroarch, retrodeck, retropie
- DSP-4 data ROM
st010.program.rom -optional
- Size: 48.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:100 - Platforms: lakka, retroarch, retrodeck, retropie
- ST-010 program ROM
st010.data.rom -optional
- Size: 4.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:100 - Platforms: lakka, retroarch, retrodeck, retropie
- ST-010 data ROM
st011.program.rom -optional
- Size: 48.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:101 - Platforms: lakka, retroarch, retrodeck, retropie
- ST-011 program ROM
st011.data.rom -optional
- Size: 4.0 KB
- Validation: size
- Source:
Core/NecDsp.cpp:101 - Platforms: lakka, retroarch, retrodeck, retropie
- ST-011 data ROM
dmg_boot.bin -optional, HLE available
- Size: 256 B
- Aliases:
gb_bios.bin - Validation: size
- Source:
Core/FirmwareHelper.h:148, Core/Gameboy.cpp:108-114, Core/GbBootRom.h:6 - Platforms: lakka, recalbox, retroarch, retropie
- Game Boy (DMG) boot ROM. Falls back to embedded SameBoy open-source boot ROM
cgb_boot.bin -optional, HLE available
- Size: 2.2 KB
- Aliases:
gbc_bios.bin - Validation: size
- Source:
Core/FirmwareHelper.h:149, Core/Gameboy.cpp:108-119, Core/GbBootRom.h:6 - Platforms: lakka, recalbox, retroarch, retropie
- Game Boy Color boot ROM. Falls back to embedded SameBoy open-source boot ROM
sgb_boot.bin -optional, HLE available
- Size: 256 B
- Aliases:
sgb_bios.bin - Validation: size
- Source:
Core/FirmwareHelper.h:150, Core/Gameboy.cpp:108-127, Core/GbBootRom.h:6 - Platforms: batocera, recalbox, retrobat
- Super Game Boy boot ROM for GB CPU. Falls back to embedded SameBoy open-source boot ROM
sgb2_boot.bin -optional, HLE available
- Size: 256 B
- Aliases:
sgb_bios.bin - Validation: size
- Source:
Core/FirmwareHelper.h:151, Core/Gameboy.cpp:108-127, Core/GbBootRom.h:6 - Platforms: batocera, recalbox, retrobat, retrodeck
- Super Game Boy 2 boot ROM for GB CPU. Falls back to embedded SameBoy open-source boot ROM
SGB1.sfc -optional
- Size: 256.0 KB
- Validation: size
- Source:
Core/FirmwareHelper.h:118-133, Core/BaseCartridge.cpp:630-638 - Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
- Super Game Boy SNES cartridge ROM. Without it, SGB mode falls back to regular GB
SGB2.sfc -optional
- Size: 512.0 KB
- Validation: size
- Source:
Core/FirmwareHelper.h:118-133, Core/BaseCartridge.cpp:630-638 - Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
- Super Game Boy 2 SNES cartridge ROM. Core option mesen-s_sgb2 selects SGB version
BS-X.bin -optional
- Size: 1.0 MB
- Validation: size
- Source:
Core/FirmwareHelper.h:39-47,96-113, Core/BaseCartridge.cpp:65 - Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
- Satellaview BS-X BIOS ROM. Minimum accepted size is 32768 bytes
Generated on 2026-03-25T14:56:43Z