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Mednafen STV
Type libretro
Classification Community forks
Source https://github.com/beudbeud/libretro-stv
Upstream https://mednafen.github.io/
Version v1.2.1
Revision beudbeud/libretro-stv@2e42ef0c5d82
Profiled 2026-10-17
Profile YAML, JSON
Cores mednafen_stv
Systems sega-stv, sega-saturn
Technical notes

Libretro core by beudbeud built on the Saturn/ST-V module of Mednafen 1.32.1, with an Asia ST-V BIOS setting and a stvbios.zip fallback added to ss.cpp. Recalbox runs it for ST-V, and the loader also accepts Saturn disc images (cue, toc, ccd, chd, m3u).

retro_init() points filesys.path_firmware at the frontend system directory and names the BIOS of every region (ref: libretro/libretro.cpp:615-641). The ST-V BIOS is picked by SMPC area: Japan, Asia NTSC, Europe PAL, and North America for every other area (ref: mednafen/ss/ss.cpp:1436-1446, mednafen/ss/smpc.h:32-40). A Saturn disc takes sega_101.bin for Japan and Asia NTSC and mpr-17933.bin otherwise (ref: mednafen/ss/ss.cpp:1447-1453).

The loose file is tried first and must be exactly 524288 bytes. When it is missing or the wrong size, the same name is looked up at the root of stvbios.zip in the system directory, then without the leading slash (ref: mednafen/ss/ss.cpp:1455-1491). With ss.bios_sanity on, the default, a file named like one of the five Saturn BIOS images must match its SHA-256. The ST-V images are not in that table and only the size check applies (ref: mednafen/ss/ss.cpp:1493-1540, 2549).

Saturn games that need the KoF 95 or Ultraman ROM cartridge, and the Action Replay 4M Plus cart type, open their ROM from the firmware directory under the default names below (ref: mednafen/ss/ss.cpp:1348-1350, 1404-1412, 2542-2544).

10 files | 6 required, 4 optional | 10 in repo, 0 missing Categories: 9 BIOS, 1 BIOS ZIPs

epr-20091.ic8 required in repo japan #
ST-V BIOS (Japan)

epr-19854.ic8 required in repo asia-ntsc #
ST-V BIOS (Asia/Taiwan)

epr-17952a.ic8 required in repo north-america, latin-america, brazil, south-korea, asia-pal #
ST-V BIOS (North America)

epr-17954a.ic8 required in repo europe #
ST-V BIOS (Europe)

stvbios.zip optional in repo bios_zip #
ST-V BIOS archive

sega_101.bin required in repo japan, asia-ntsc #
Saturn BIOS (Japan)

mpr-17933.bin required in repo north-america, latin-america, brazil, south-korea, asia-pal, europe, oceania #
Saturn BIOS (North America/Europe)

mpr-18811-mx.ic1 optional in repo #
The King of Fighters '95 ROM cartridge

mpr-19367-mx.ic1 optional in repo #
Ultraman ROM cartridge

satar4mp.bin optional in repo #
Action Replay 4M Plus firmware

Generated on 2026-10-20T03:49:42Z