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# bsnes-jg - RetroBIOS

Type | libretro
Classification | community_fork
Source | https://github.com/libretro/bsnes-jg
Upstream | https://gitlab.com/jgemu/bsnes
Version | 2.1.0
Profiled | 2026-03-23
Cores | bsnes-jg
Systems | nintendo-snes, nintendo-sgb, nintendo-satellaview, nintendo-sufami-turbo

Technical notes

Fork of bsnes v115 by Rupert Carmichael, rewritten for C++ standard library. Coprocessor firmware loaded from system_dir via openFileCallback. HLE available for DSP1/1B/2/4 and ST010 (core option bsnes_jg_coproc_preferhle). DSP3, ST011, ST018 require LLE firmware in all cases (no HLE path). CX4/HitachiDSP uses embedded static data ROM (3072 bytes), no external file. SGB1/SGB2 boot ROMs embedded (256 bytes each). BML game databases embedded as C++ string literals.

ref: libretro/libretro.cpp:420-502 fileOpenV firmware loading callback ref: src/cartridge.cpp:754-829 uPD7725 (DSP1-4) LLE/HLE dispatch ref: src/cartridge.cpp:831-901 uPD96050 (ST010/ST011) LLE/HLE dispatch ref: src/cartridge.cpp:615-670 ARM6 (ST018) firmware loading ref: src/cartridge.cpp:672-752 HG51BS169 (HitachiDSP/CX4) embedded ROM + HLE ref: src/coprocessor/icd.cpp:249,260 SGB1/SGB2 boot ROMs embedded ref: src/cartridge.cpp:62 hitachidspStaticDataROM embedded ref: libretro/libretro.cpp:30-33 BML databases embedded

16 files | 0 required, 16 optional | 16 in repo, 0 missing | 10 with HLE fallback

`dsp1.program.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:429, src/cartridge.cpp:774,798-804`
- Platforms: lakka, retroarch, retropie

`dsp1.data.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:432, src/cartridge.cpp:786,798-804`
- Platforms: lakka, retroarch, retrodeck, retropie

`dsp1b.program.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:435, src/cartridge.cpp:774,798-804`
- Platforms: lakka, retroarch, retrodeck, retropie

`dsp1b.data.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:438, src/cartridge.cpp:786,798-804`
- Platforms: lakka, retroarch, retrodeck, retropie

`dsp2.program.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:441, src/cartridge.cpp:774,806-811`
- Platforms: lakka, retroarch, retrodeck, retropie

`dsp2.data.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:444, src/cartridge.cpp:786,806-811`
- Platforms: lakka, retroarch, retrodeck, retropie

`dsp3.program.rom` -optional

- System: nintendo-snes
- Source: `libretro/libretro.cpp:447-448, src/cartridge.cpp:774,822-828`
- Platforms: lakka, retroarch, retrodeck, retropie

`dsp3.data.rom` -optional

- System: nintendo-snes
- Source: `libretro/libretro.cpp:451-452, src/cartridge.cpp:786,822-828`
- Platforms: lakka, retroarch, retrodeck, retropie

`dsp4.program.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:455, src/cartridge.cpp:774,813-818`
- Platforms: lakka, retroarch, retrodeck, retropie

`dsp4.data.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:458, src/cartridge.cpp:786,813-818`
- Platforms: lakka, retroarch, retrodeck, retropie

`st010.program.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:461, src/cartridge.cpp:851,872-882`
- Platforms: lakka, retroarch, retrodeck, retropie

`st010.data.rom` -optional, HLE available

- System: nintendo-snes
- Source: `libretro/libretro.cpp:464, src/cartridge.cpp:863,872-882`
- Platforms: lakka, retroarch, retrodeck, retropie

`st011.program.rom` -optional

- System: nintendo-snes
- Source: `libretro/libretro.cpp:467-468, src/cartridge.cpp:851,884-901`
- Platforms: lakka, retroarch, retrodeck, retropie

`st011.data.rom` -optional

- System: nintendo-snes
- Source: `libretro/libretro.cpp:471-472, src/cartridge.cpp:863,884-901`
- Platforms: lakka, retroarch, retrodeck, retropie

`st018.program.rom` -optional

- System: nintendo-snes
- Aliases: `arm6.program.rom`
- Source: `libretro/libretro.cpp:475-476, src/cartridge.cpp:640`
- Platforms: lakka, retroarch, retrodeck, retropie

`st018.data.rom` -optional

- System: nintendo-snes
- Aliases: `arm6.data.rom`
- Source: `libretro/libretro.cpp:479-480, src/cartridge.cpp:650`
- Platforms: lakka, retroarch, retropie

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