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RetroBIOS

Kronos

Kronos emulates Sega Saturn and Sega ST-V. It reads 20 files, 2 of them required: without a required file it does not start games. A required file is needed only by the machines that use it. Each file below cites the line of source code that reads it.

About this profile
Detail Value
Type libretro
Classification Official port
Source https://github.com/libretro/yabause
Upstream https://github.com/FCare/Kronos
Version 2.7.0, stated in yabause/src/libretro/Makefile.common
Revision libretro/yabause@3791ffb2221f, FCare/Kronos@d0384bc33aad, branch kronos
Profiled 2026-03-24
Profile YAML, JSON
Cores kronos
Systems Sega Saturn, Sega ST-V
Install this emulator's files

The installer finds your setup and its BIOS folder, then downloads only the files this emulator reads there and checks each one.

Open the Start menu. Type PowerShell and open it. Paste the line. Press Enter.

PowerShell
&([scriptblock]::Create((irm https://abdess.github.io/retrobios/i.ps1))) --emulator kronos
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: retro_load_game() at yabause/src/libretro/libretro.c:1601-1727. STV blob table: BiosList at yabause/src/ctrl/src/stv.c:112-136. ROM cartridge DB: yabause/src/utils/src/db.c:43-45.

Standalone supports MPEG card ROM loading (Video CD card). Disabled in libretro port (mpegpath = NULL in yabause/src/libretro/libretro.c:1578).

Files

Section titled “Files”

20 files: 2 required, 18 optional.

In this collection: 20 in repo and 0 missing.

Required

Section titled “Required”
FileStatus

saturn_bios.bin

  • Path: kronos/saturn_bios.bin
  • System: Sega Saturn
  • Primary Saturn BIOS. Any region accepted. Searched in kronos/ subdir first.
Priority, validation and source
required for Sega Saturn in repo

stvbios.zip

  • System: Sega ST-V
  • MAME-style ZIP containing ST-V region BIOS EPROMs. Searched in kronos/ subdir first.
Source
required for Sega ST-V in repo

Optional

Section titled “Optional”
FileStatusHash

sega_101.bin

  • System: Sega Saturn
  • Saturn BIOS v1.01 (Japan). Fallback if saturn_bios.bin missing.
Priority, validation and source
in repo-

mpr-17933.bin

  • System: Sega Saturn
  • Saturn BIOS (NA/EU). Last fallback for Saturn mode.
Priority, validation and source
in repo-

epr-23603.ic8

Hashes, validation and source
in repo Region: Japan in stvbios.zipCRC32 f688ae60

epr-20091.ic8

Hashes, validation and source
in repo Region: Japan in stvbios.zipCRC32 59ed40f4

epr-19730.ic8

Hashes, validation and source
in repo Region: Japan in stvbios.zipCRC32 d0e0889d

epr-17951a.ic8

Hashes, validation and source
in repo Region: Japan in stvbios.zipCRC32 2672f9d8

epr-17740a.ic8

Hashes, validation and source
in repo Region: Japan in stvbios.zipCRC32 3e23c81f

epr-17740.ic8

Hashes, validation and source
in repo Region: Japan in stvbios.zipCRC32 5c5aa63d

epr-17954a.ic8

  • System: Sega ST-V
  • Loaded only when the set allows STV_REGION_EU. Among allowed regions the kronos_stv_favorite_region option, Europe by default, picks (yabause/src/ctrl/src/stv.c:2435, 2562-2564).
Hashes, validation and source
in repo Region: Europe in stvbios.zipCRC32 f7722da3

epr-17952a.ic8

Hashes, validation and source
in repo Region: North America in stvbios.zipCRC32 d1be2adf

epr-17741a.ic8

Hashes, validation and source
in repo Region: North America in stvbios.zipCRC32 4166c663

epr-19854.ic8

Hashes, validation and source
in repo Region: Taiwan in stvbios.zipCRC32 e09d1f60

epr-17953a.ic8

Hashes, validation and source
in repo Region: Taiwan in stvbios.zipCRC32 a4c47570

epr-17742a.ic8

Hashes, validation and source
in repo Region: Taiwan in stvbios.zipCRC32 02daf123

stv110.bin

Hashes, validation and source
in repo in stvbios.zipCRC32 3dfeda92

stv1061.bin

Hashes, validation and source
in repo in stvbios.zipCRC32 728dbca3

mpr-18811-mx.ic1

  • System: Sega Saturn
  • ROM cartridge for The King of Fighters '95. Auto-detected via game DB.
Validation and source
in repo-

mpr-19367-mx.ic1

  • System: Sega Saturn
  • ROM cartridge for Ultraman: Hikari no Kyojin Densetsu. Auto-detected via game DB.
Validation and source
in repo-

Next steps

Section titled “Next steps”
.

Maintained by Abdess on GitHub. Report a problem.

Packs from release v2026.10.10, .

MIT for the tooling and metadata. BIOS and firmware files are third-party system software, preserved for personal backup, archival and interoperability.