mednafen_supergrafx - RetroBIOS

Type	libretro
Classification	Community forks
Source	https://github.com/libretro/beetle-supergrafx-libretro
Upstream	https://mednafen.github.io/
Version	v1.23.0
Profiled	2026-03-24
Cores	mednafen_supergrafx, beetle_supergrafx
Systems	nec-pc-engine
Verification mode	existence

Technical notes

Fork of Mednafen's pce_fast module with SuperGrafx and CD support. Separate codebase from beetle_pce (mednafen/pce_fast/ vs mednafen/pce/). BIOS loaded via HuC_LoadCD() at CD-ROM load time. Core option "sgx_cdbios" selects which card image to use (default: System Card 3). DetectGECD() auto-detects Games Express discs and overrides to gexpress.pce. DetectSGXCD() detects SuperGrafx CD titles via magic bytes. Arcade Card mode (sgx_arcadecard option, not exposed) extends System Card 3 with extra RAM mapping. No hash or size validation on BIOS load. Upstream pce_fast module has a single pce_fast.cdbios string setting; the 4-option dropdown is a libretro addition. Upstream has no separate gecdbios setting (unlike the accurate pce module).

4 files | 1 required, 3 optional | 4 in repo, 0 missing

syscard3.pce required in repo NTSC-J
CD-ROM System Card 3.0 (Japan)

• Source: libretro.cpp:972-973, mednafen/settings.cpp:37
• Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
• Default value for sgx_cdbios option.

syscard2.pce optional in repo NTSC-J
CD-ROM System Card 2.0 (Japan)

• Source: libretro.cpp:974-975
• Platforms: lakka, recalbox, retroarch, retrodeck, retropie, romm
• sgx_cdbios = 'System Card 2'.

syscard1.pce optional in repo NTSC-J
CD-ROM System Card 1.0 (Japan)

• Source: libretro.cpp:976-977
• Platforms: lakka, recalbox, retroarch, retrodeck, retropie, romm
• sgx_cdbios = 'System Card 1'.

gexpress.pce optional in repo NTSC-J
Games Express CD Card

• Source: libretro.cpp:978-979, mednafen/pce_fast/pce.cpp:330-367,453-454
• Platforms: lakka, recalbox, retroarch, retrodeck, retropie, romm
• sgx_cdbios = 'Games Express' or auto-detected via DetectGECD().

Generated on 2026-04-03T20:37:39Z