bsnes-mercury - RetroBIOS

Type	libretro
Classification	enhanced_fork
Source	https://github.com/libretro/bsnes-mercury
Upstream	https://byuu.org/higan
Version	v094 (Mercury)
Profiled	2026-03-25
Cores	bsnes_mercury_accuracy, bsnes_mercury_balanced, bsnes_mercury_performance
Systems	nintendo-snes, nintendo-sgb, nintendo-satellaview, nintendo-sufami-turbo

Technical notes

Fork of higan v094 by Alcaro. Restores HLE for coprocessor chips removed in v094, adds firmware_appended support and SuperFX overclocking. Three profiles: accuracy, balanced, performance (PPU differs, not firmware). Core option bsnes_chip_hle (default LLE, requires bsnes_violate_accuracy) controls HLE/LLE at runtime. ref: target-libretro/libretro.cpp:428-442

Firmware loaded from system_dir via file::exists + mmapstream. No hash or size validation on any firmware file. ref: target-libretro/libretro.cpp:242-264

firmware_appended: firmware can be appended to end of ROM file. ref: ananke/heuristics/super-famicom.hpp:83

SPC700 IPL ROM (64 bytes) is embedded in the binary. ref: target-libretro/libretro.cpp:39

Upstream higan v094 by byuu (2014, site defunct). Mercury preserves v094 code with HLE additions documented in changes.diff at repo root.

18 files | 0 required, 18 optional | 18 in repo, 0 missing | 13 with HLE fallback

dsp1.program.rom -optional, HLE available

• System: nintendo-snes
• Size: 6.0 KB
• Source: sfc/cartridge/markup.cpp:422-432
• Platforms: lakka, retroarch, retropie
• only loaded via custom BML manifest, ananke uses dsp1b

dsp1.data.rom -optional, HLE available

• System: nintendo-snes
• Size: 2.0 KB
• Source: sfc/cartridge/markup.cpp:422-432
• Platforms: lakka, retroarch, retrodeck, retropie
• only loaded via custom BML manifest, ananke uses dsp1b

dsp1b.program.rom -optional, HLE available

• System: nintendo-snes
• Size: 6.0 KB
• Source: ananke/heuristics/super-famicom.hpp:381
• Platforms: lakka, retroarch, retrodeck, retropie

dsp1b.data.rom -optional, HLE available

• System: nintendo-snes
• Size: 2.0 KB
• Source: ananke/heuristics/super-famicom.hpp:382
• Platforms: lakka, retroarch, retrodeck, retropie

dsp2.program.rom -optional, HLE available

• System: nintendo-snes
• Size: 6.0 KB
• Source: ananke/heuristics/super-famicom.hpp:403
• Platforms: lakka, retroarch, retrodeck, retropie

dsp2.data.rom -optional, HLE available

• System: nintendo-snes
• Size: 2.0 KB
• Source: ananke/heuristics/super-famicom.hpp:404
• Platforms: lakka, retroarch, retrodeck, retropie

dsp3.program.rom -optional, HLE available

• System: nintendo-snes
• Size: 6.0 KB
• Source: ananke/heuristics/super-famicom.hpp:417
• Platforms: lakka, retroarch, retrodeck, retropie

dsp3.data.rom -optional, HLE available

• System: nintendo-snes
• Size: 2.0 KB
• Source: ananke/heuristics/super-famicom.hpp:418
• Platforms: lakka, retroarch, retrodeck, retropie

dsp4.program.rom -optional, HLE available

• System: nintendo-snes
• Size: 6.0 KB
• Source: ananke/heuristics/super-famicom.hpp:431
• Platforms: lakka, retroarch, retrodeck, retropie

dsp4.data.rom -optional, HLE available

• System: nintendo-snes
• Size: 2.0 KB
• Source: ananke/heuristics/super-famicom.hpp:432
• Platforms: lakka, retroarch, retrodeck, retropie

cx4.data.rom -optional, HLE available

• System: nintendo-snes
• Size: 3.0 KB
• Source: ananke/heuristics/super-famicom.hpp:146
• Platforms: lakka, retroarch, retrodeck, retropie

st010.program.rom -optional, HLE available

• System: nintendo-snes
• Size: 48.0 KB
• Source: ananke/heuristics/super-famicom.hpp:445
• Platforms: lakka, retroarch, retrodeck, retropie

st010.data.rom -optional, HLE available

• System: nintendo-snes
• Size: 4.0 KB
• Source: ananke/heuristics/super-famicom.hpp:446
• Platforms: lakka, retroarch, retrodeck, retropie

st011.program.rom -optional

• System: nintendo-snes
• Size: 48.0 KB
• Source: ananke/heuristics/super-famicom.hpp:460
• Platforms: lakka, retroarch, retrodeck, retropie

st011.data.rom -optional

• System: nintendo-snes
• Size: 4.0 KB
• Source: ananke/heuristics/super-famicom.hpp:461
• Platforms: lakka, retroarch, retrodeck, retropie

st018.program.rom -optional

• System: nintendo-snes
• Size: 128.0 KB
• Source: ananke/heuristics/super-famicom.hpp:475
• Platforms: lakka, retroarch, retrodeck, retropie

st018.data.rom -optional

• System: nintendo-snes
• Size: 32.0 KB
• Source: ananke/heuristics/super-famicom.hpp:476
• Platforms: lakka, retroarch, retropie

sgb.boot.rom -optional

• System: nintendo-sgb
• Size: 256 B
• Source: ananke/heuristics/super-famicom.hpp:133
• Platforms: lakka, retroarch, retropie

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