Kronos - RetroBIOS

Type	libretro
Classification	official_port
Source	https://github.com/libretro/yabause
Upstream	https://github.com/FCare/Kronos
Version	v2.6.0
Profiled	2026-03-24
Cores	kronos
Systems	sega-saturn, sega-stv

Technical notes

Kronos is a Sega Saturn and ST-V arcade emulator by FCare, forked from Yabause. Requires OpenGL 4.3 compute shaders.

Saturn BIOS search order: 1. {system}/kronos/saturn_bios.bin 2. {system}/saturn_bios.bin 3. {system}/sega_101.bin 4. {system}/mpr-17933.bin First file found wins. Real BIOS required (HLE deprecated, only available via kronos_force_hle_bios core option for debugging).

ST-V BIOS: {system}/kronos/stvbios.zip or {system}/stvbios.zip MAME-style ZIP containing region-specific EPROMs. Kronos picks the best match by game region and kronos_stv_favorite_region core option (EU/US/JP/TW).

ROM cartridges for KOF95 and Ultraman are auto-detected via game database (db.c) and loaded from system_dir when the corresponding game is running.

BIOS loading: libretro.c retro_load_game() lines 1601-1727. STV blob table: ctrl/src/stv.c BiosList lines 112-136. ROM cartridge DB: utils/src/db.c lines 43-45.

Standalone supports MPEG card ROM loading (Video CD card); disabled in libretro port (mpegpath = NULL in libretro.c:1578).

20 files | 2 required, 18 optional | 6 in repo, 14 missing

saturn_bios.bin -required

• System: sega-saturn
• Size: 512.0 KB
• Validation: size
• Source: libretro.c:1619-1623
• Platforms: batocera, emudeck, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
• Primary Saturn BIOS. Any region accepted. Searched in kronos/ subdir first.

sega_101.bin -optional, japan

• System: sega-saturn
• Size: 512.0 KB
• Validation: size
• Source: libretro.c:1627
• Platforms: batocera, emudeck, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
• Saturn BIOS v1.01 (Japan). Fallback if saturn_bios.bin missing.

mpr-17933.bin -optional, north-america, europe

• System: sega-saturn
• Size: 512.0 KB
• Validation: size
• Source: libretro.c:1631
• Platforms: batocera, emudeck, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
• Saturn BIOS (NA/EU). Last fallback for Saturn mode.

stvbios.zip -required

• System: sega-stv
• Source: libretro.c:1608-1617, ctrl/src/stv.c:112-136
• Platforms: lakka, recalbox, retroarch, retrobat, retrodeck, retropie
• MAME-style ZIP containing ST-V region BIOS EPROMs. Searched in kronos/ subdir first.

epr-23603.ic8 -optional, japan, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: f688ae60
• Validation: crc32
• Source: stv.c:120

epr-20091.ic8 -optional, japan, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: 59ed40f4
• Validation: crc32
• Source: stv.c:121

epr-19730.ic8 -optional, japan, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: d0e0889d
• Validation: crc32
• Source: stv.c:122

epr-17951a.ic8 -optional, japan, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: 2672f9d8
• Validation: crc32
• Source: stv.c:123

epr-17740a.ic8 -optional, japan, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: 3e23c81f
• Validation: crc32
• Source: stv.c:124

epr-17740.ic8 -optional, japan, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: 5c5aa63d
• Validation: crc32
• Source: stv.c:125

epr-17954a.ic8 -optional, europe, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: f7722da3
• Validation: crc32
• Source: stv.c:126

epr-17952a.ic8 -optional, north-america, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: d1be2adf
• Validation: crc32
• Source: stv.c:127

epr-17741a.ic8 -optional, north-america, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: 4166c663
• Validation: crc32
• Source: stv.c:128

epr-19854.ic8 -optional, taiwan, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: e09d1f60
• Validation: crc32
• Source: stv.c:129

epr-17953a.ic8 -optional, taiwan, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: a4c47570
• Validation: crc32
• Source: stv.c:130

epr-17742a.ic8 -optional, taiwan, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: 02daf123
• Validation: crc32
• Source: stv.c:131

stv110.bin -optional, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: 3dfeda92
• Validation: crc32
• Source: stv.c:132

stv1061.bin -optional, in stvbios.zip, missing from repo

• System: sega-stv
• Size: 512.0 KB
• CRC32: 728dbca3
• Validation: crc32
• Source: stv.c:133

mpr-18811-mx.ic1 -optional

• System: sega-saturn
• Size: 2.0 MB
• Validation: size
• Source: utils/src/db.c:43-44, sys/memory/src/cs0.c:1526-1544
• Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
• ROM cartridge for The King of Fighters '95. Auto-detected via game DB.

mpr-19367-mx.ic1 -optional

• System: sega-saturn
• Size: 2.0 MB
• Validation: size
• Source: utils/src/db.c:45, sys/memory/src/cs0.c:1526-1544
• Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
• ROM cartridge for Ultraman: Hikari no Kyojin Densetsu. Auto-detected via game DB.

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