{
  "count": 1,
  "generated_at": "2026-10-20T02:57:31Z",
  "items": [
    {
      "id": "bigpemu",
      "profile": {
        "core_version": "1.221",
        "cores": [
          "bigpemu"
        ],
        "display_name": "BigPEmu (Atari Jaguar)",
        "emulator": "BigPEmu",
        "files": [
          {
            "config_key": "BootROM",
            "description": "Jaguar cartridge boot ROM, read when the Boot ROM Image setting is set",
            "name": "[BIOS] Atari Jaguar (World).j64",
            "note": "The setting accepts any image under any name and no content is checked. The name is a label for the retail boot ROM.",
            "required": false,
            "source_ref": "bigpemu FUN_006d8be0 (BootROM read), FUN_006a0c30 (handed to the machine)",
            "system": "atari-jaguar"
          },
          {
            "config_key": "CDBIOS",
            "description": "Jaguar CD BIOS, read when the CD BIOS Image setting is set and a disc is mounted",
            "name": "[BIOS] Atari Jaguar CD (World).j64",
            "note": "Any image is used. The retail CD BIOS is recognised by the 64-bit FNV-1a of its first 16384 bytes, 0x7000d38f77b6d407, which installs a dedicated handler set for it. Needed to play audio discs.",
            "required": false,
            "source_ref": "bigpemu FUN_006d8be0 (CDBIOS read), FUN_006a8ae0 (FNV-1a check), FUN_0075f5a0 (audio discs)",
            "system": "atari-jaguarcd"
          }
        ],
        "mode": "standalone",
        "notes": "Closed-source Atari Jaguar and Jaguar CD emulator by Rich Whitehouse. Read\nfrom the Linux x64 binary of BigPEmu_Linux64_v1221.tar.gz (sha1\n11e8188481ec3dd6508f2497fb35c6ae15907975, from the author's builds page),\ndecompiled with Ghidra at its default image base of 0x100000. The Windows\narchive BigPEmu_v1221.zip (sha1 879cf1c2ecb426a066703b742f626e14f37d683e)\ncarries the same settings and strings.\n\nBoth firmware images are optional settings, BootROM and CDBIOS, each holding\na path the user picks in the menu (Boot ROM Image, CD BIOS Image). Nothing\nis searched by name. A set path is read whole into memory when an image is\nbooted, through the same reader that loads software images, which also\naccepts a zip. No size is checked.\nref: bigpemu FUN_006d8be0 (BootROM and CDBIOS read at boot),\n     FUN_006f4e20 (setting path to buffer), FUN_007d7e20 (image reader),\n     FUN_00762210 and FUN_00761d50 (CDBIOS path setting and browser)\n\nWithout a boot ROM a cartridge runs from its own entry point. Without a CD\nBIOS a disc boots on three replacement blocks decompressed from the\nexecutable, 4 KB, 8 KB and 4 KB. The CD BIOS is read only when a disc is mounted. Audio discs\nrefuse to load without one, and the System Audio virtual disc asks for one.\nref: bigpemu FUN_006d8be0 (embedded CD boot blocks), FUN_0075f5a0\n     (STR_AUDIO_CD_NO_BIOS), FUN_00762550 (STR_VDISC_NEEDBIOS)\n\nEEPROM and memory track files are written by the emulator itself, named\ngame<hash>_eeprom.bigpeep and game<hash>_memtrack.bigpmt, beside the image\nor in user data. Scripts, screen effects, VR lenses and cheat_codes.json\nship in the archive.\nref: bigpemu FUN_007d55b0, FUN_007d5690\n",
        "profiled_date": "2026-10-20",
        "source": "https://www.richwhitehouse.com/jaguar/",
        "systems": [
          "atari-jaguar",
          "atari-jaguarcd"
        ],
        "type": "standalone",
        "upstream": "https://www.richwhitehouse.com/jaguar/",
        "version_source": {
          "pattern": "Current Version: <strong>([0-9.]+)</strong>",
          "url": "https://www.richwhitehouse.com/jaguar/index.php?content=download"
        }
      }
    }
  ],
  "kind": "emulators",
  "schema_version": 1
}