emulator: SSF
type: standalone
core_classification: other
source: "https://github.com/shimazzz/SEGASaturnEmulator-SSF"
upstream: closed-source
author: "Shima"
profiled_date: "2026-08-12"
core_version: "PreviewVer R38"
display_name: "Sega - Saturn/ST-V (SSF)"
cores:
  - ssf
systems:
  - sega-saturn
  - sega-stv
mode: standalone

notes: |
  Sega Saturn and ST-V emulator by Shima, closed source and distributed as a
  binary. Two artifacts are read here and they describe the same emulator: the
  Windows build SSF_PreviewVer_R38.zip of 2026-01-01, sha256
  7325a9b9d666560ddf632f747fb42ab880f82c45391e51fe0716beb1c535f00b, whose
  emulator is the 64-bit SSF.exe and which is cited by virtual address; and the
  Android build SSF_AndroidVer.zip of 2022-08-07, package
  com.xrea.g2.aaaaaaaa.ssf, whose lib/arm64-v8a/libnative-lib.so keeps its 40738
  dynamic symbols and which is cited by symbol. Prose references name the
  Japanese documentation shipped in Document/.

  Every path below is stored in full in SSF.ini and picked through a file dialog
  filtered on "all files (*.*)". SSF fixes no filename and no directory for any
  of them and looks for none, so the names used here are the dumps that fill
  each slot rather than names the code searches.

  Saturn BIOS, [Peripheral] SaturnBIOS. Readme.txt describes the image as the
  console address range 00000000-0007FFFF and states that the filename is free.
  Neither a length nor a hash is compared against the file. The one routine that
  walks the 512 KiB BIOS area is CStateSaveBase::_GetBIOSHash, which folds it
  into the checksum pair that tags a save state.

  Running without it is a supported mode, [Program4] NoBIOS. SSF carries a boot
  ROM of its own, an embedded program with the SYS_* system calls and the
  interrupt vectors, and in that mode the backup library is always hooked.
  Readme.txt records lower compatibility and advises supplying a BIOS.

  ST-V is entered by holding left Shift at launch. [Peripheral] STVBIOS names
  the motherboard EPROM, and both the option reference and the No BIOS entry of
  Readme.txt state that ST-V does not run without it.

  ST-V cartridges are the game and are read from a ZIP: the loader takes the
  extension of each member as its IC number, accepts 1 through 13, byte-swaps
  every mask ROM in 16-bit units, doubles each byte of the IC13 EPROM across the
  16-bit bus, then mirrors each chip over its window. IC7 and IC13 are
  exclusive. STV_ROM.html gives the same layout and notes that MAME ROM sets fit
  once the extensions are changed.

  Cheat scripts live in Cheat/ under the disc product number. Six ship with the
  emulator and the memory cheat dialog writes more.

  Everything else the binary opens it also writes: SSF.ini, Setting.ini,
  Setting/, Backup/, StateSave/, CDIndex/, Snapshot/, Wave/, ExtractSound/,
  DebugData/, and the LLVM/ object cache that the bundled CreateObject.exe and
  clang.exe compile from the user's own disc for the local CPU.

files:
  - name: "sega_101.bin"
    aliases:
      - mpr-17933.bin
      - sega_100.bin
      - sega_100a.bin
      - sega1003.bin
      - hisaturn.bin
      - vsaturn.bin
    system: sega-saturn
    required: false
    hle_fallback: true
    size: 524288
    description: "Saturn BIOS"
    note: "Any dump of the 512 KiB console ROM, the compatible machines included. Area code is chosen by [Peripheral] Areacode and AutoAreacode, not by the image, so no region selects this file."
    source_ref: "SSF.exe 0x43d770 (SaturnBIOS 0x129b1f8), SSF.exe 0x129a2f8 with the filter at 0x129a310, SSF.exe 0x43ff96 (NoBIOS 0x129b4cc), libnative-lib.so SSF::CStateSaveBase::_GetBIOSHash 0x134b8ec-0x134b924, SSF-archive Document/Readme.txt BIOSファイルについて"

  - name: "epr-20091.ic8"
    aliases:
      - epr-23603.ic8
      - epr-19730.ic8
      - epr-19854.ic8
      - epr-17951a.ic8
      - epr-17952a.ic8
      - epr-17953a.ic8
      - epr-17954a.ic8
      - epr-17740.ic8
      - epr-17740a.ic8
      - epr-17741a.ic8
      - epr-17742a.ic8
    system: sega-stv
    required: true
    size: 524288
    description: "ST-V BIOS"
    note: "Loose 512 KiB EPROM image, read outside the cartridge ZIP. Any of the board revisions is accepted, the code branching on none of them."
    source_ref: "SSF.exe 0x43d91f (STVBIOS 0x129b218), SSF.exe 0x129a328, SSF-archive Document/Readme.txt ST-V BIOS option, SSF-archive Document/Readme.txt No BIOS option"

  - name: "<cartridge>.bin"
    system: sega-saturn
    required: false
    category: game_data
    description: "cartridge image mapped at A-Bus CS0"
    note: "[Peripheral] DataCartridge, gated by DataCartridgeEnable and off by default. SSF reads the file at the configured path into the 32 MiB A-Bus CS0 window and identifies it in no way; the dumps that belong there are the two Saturn ROM carts, mpr-18811-mx.ic1 for The King of Fighters '95 and mpr-19367-mx.ic1 for Ultraman. Readme.txt records the option as unverified."
    source_ref: "SSF.exe 0x43e26b (DataCartridge 0x1298838), SSF.exe 0x43e178 (DataCartridgeEnable 0x1298820), SSF.exe 0x129a340, SSF.exe 0x916e5e-0x916e84, SSF-archive Document/Readme.txt Data Cartridge option"

  - name: "<name>.cht"
    path: "Cheat/<product id>/<name>.cht"
    system: sega-saturn
    required: false
    bundled: true
    category: game_data
    description: "cheat script"
    note: "Read when [Program4] EnableCheat is set, from the directory named after the disc product number. The format is a script language: triggers on first read, field, file, sector, CDDA and scanline, memory reads and writes, storage slots, branches and labels. Six ship with the emulator; the memory cheat dialog saves its own with the target address in the name."
    source_ref: "SSF.exe 0x4403c0 (EnableCheat 0x1298de0), SSF.exe 0x12998a0, SSF.exe 0x129a658, SSF.exe command table 0x128c570-0x128c808"