{ "count": 1, "generated_at": "2026-10-20T02:57:31Z", "items": [ { "id": "geartowns", "profile": { "core_classification": "official_port", "core_version": "0.0.6-8-g25d2025", "cores": [ "geartowns" ], "display_name": "Fujitsu - FM Towns (Geartowns)", "emulator": "Geartowns", "files": [ { "category": "bios_zip", "contents": [ { "crc32": "53319e23", "name": "fmt_sys.rom", "size": 262144 }, { "crc32": "112872ee", "name": "fmt_dos.rom", "size": 524288 }, { "crc32": "955c6b75", "name": "fmt_fnt.rom", "size": 262144 }, { "crc32": "b314c659", "name": "fmt_dic.rom", "size": 524288 } ], "description": "FM Towns Model 1/2 firmware set", "name": "fmtowns.zip", "note": "Set for the Model 1/2, the machine Auto falls back to. The same four files load from any subfolder of system/geartowns or from system/geartowns itself. The core has no CRC for a Model 1/2 20-dot Font, and fmt_f20.rom is read when present.\n", "path": "geartowns/fmtowns.zip", "required": true, "source_ref": "platforms/libretro/libretro.cpp:704-708, platforms/libretro/libretro.cpp:807-825, src/media/firmware.h:116, src/media/firmware.cpp:28-33, src/media/firmware.cpp:286-346, src/media/game_db.h:303-307", "system": "fmtowns" }, { "category": "bios_zip", "contents": [ { "crc32": "92f3fa67", "name": "fmt_sys_a.rom", "size": 262144 }, { "crc32": "22270e9f", "name": "fmt_dos_a.rom", "size": 524288 }, { "crc32": "dd6fd544", "name": "fmt_fnt.rom", "size": 262144 }, { "crc32": "82d1daa2", "name": "fmt_dic.rom", "size": 524288 }, { "crc32": "5cc7e6bc", "name": "mytownsux.rom", "size": 32 } ], "description": "FM Towns II UX firmware set", "name": "fmtownsux.zip", "note": "Set for the UX, also used by the 1F/2F, 10F/20F, CX and UG.", "path": "geartowns/fmtownsux.zip", "required": false, "source_ref": "src/media/firmware.h:118-119, src/media/firmware.cpp:28-34, src/media/game_db.h:309-314", "system": "fmtowns" }, { "category": "bios_zip", "contents": [ { "name": "mrom.m36", "size": 2097152 }, { "name": "mrom.m37", "size": 2097152 } ], "description": "FM Towns Marty firmware set", "name": "fmtmarty.zip", "note": "The core checks the CRC32 of the slices it cuts from the two mask ROMs, not of the files: System 937311F6, OS 2BC2AF96, Extension E1A9FA72, 20-dot Font 75660AAC. The Marty 2 layout with separate FMT_*.ROM and MAR_EX0.ROM to MAR_EX3.ROM files is read the same way.\n", "path": "geartowns/fmtmarty.zip", "required": false, "source_ref": "src/media/firmware.h:120, src/media/firmware.cpp:497-508, src/media/game_db.h:316-320", "system": "fmtowns" }, { "category": "bios_zip", "contents": [ { "crc32": "8aeff982", "name": "fmthr_sys.rom", "size": 262144 }, { "name": "fmt_dos.rom", "size": 524288 }, { "name": "fmt_fnt.rom", "size": 262144 }, { "name": "fmt_dic.rom", "size": 524288 }, { "crc32": "c52f0e89", "name": "mytownshr.rom", "size": 32 } ], "description": "FM Towns II HR firmware set", "name": "fmtownshr.zip", "note": "First choice for the HG. The HR itself is not emulated.", "path": "geartowns/fmtownshr.zip", "required": false, "source_ref": "src/media/firmware.h:121, src/media/firmware.cpp:28-34, src/media/game_db.h:322-324", "system": "fmtowns" }, { "category": "bios_zip", "contents": [ { "crc32": "afe4ebcf", "name": "fmt_sys.rom", "size": 262144 }, { "name": "fmt_dos.rom", "size": 524288 }, { "name": "fmt_fnt.rom", "size": 262144 }, { "name": "fmt_dic.rom", "size": 524288 }, { "crc32": "9f55a20c", "name": "fmt_f20.rom", "size": 524288 }, { "crc32": "a961aae7", "name": "mytownsftv.rom", "size": 32 } ], "description": "FM Towns II Fresh TV firmware set", "name": "fmtownsftv.zip", "note": "Second choice for the HG. The MF/Fresh itself is not emulated.", "path": "geartowns/fmtownsftv.zip", "required": false, "source_ref": "src/media/firmware.h:122, src/media/firmware.cpp:28-34, src/media/game_db.h:326-329", "system": "fmtowns" } ], "notes": "FM Towns emulator by Ignacio Sanchez (drhelius). The same tree builds the\ndesktop application and the libretro core (platforms/libretro). The core\nemulates the Model 1/2, 1F/2F, 10F/20F, II CX, UX, UG, HG and the Marty\n(src/system/machine_profiles.h:61-75, `emulated` field). The version string\nis `git describe` at build time (platforms/libretro/Makefile:369-371).\n\nretro_load_game() fails when load_bios() finds no firmware\n(platforms/libretro/libretro.cpp:704-708). load_bios() searches\nsystem/geartowns first, then the system directory itself, each time\naccepting first only a set made for the selected model and then any set\n(platforms/libretro/libretro.cpp:798-825). Firmware::FindSources() takes\nas candidates the folder itself, every direct subfolder and every .zip in\nit (src/media/firmware.cpp:286-346). Folder and zip names are free. A\ncandidate counts only when the System, OS, Font and Dictionary ROMs are all\npresent at the right size, and the CRC32 of its System ROM names the set\n(src/media/firmware.cpp:375-414, src/media/firmware.h:114-123).\n\nSix sets are known (src/media/firmware.h:114-123): fmtowns (Model 1/2),\nfreetowns (Free FM Towns Project replacement ROMs, used by the Model 1/2),\nfmtownsux (UX, also used by 1F/2F, 10F/20F, CX and UG), fmtmarty (Marty),\nfmtownshr and fmtownsftv (both used by the HG, HR preferred). On Auto the\nmodel comes from the game database and falls back to the Model 1/2 or to\nthe first model in release order that has a set\n(src/geartowns_core.cpp:1624-1649, src/geartowns_core.cpp:1691-1696). A set\nmade for another model still loads in the second pass, with a warning\n(platforms/libretro/libretro.cpp:827-860).\n\nFile names are matched without case, inside a zip only at the archive root\n(src/media/firmware.cpp:614-663). Accepted names, one group per component,\nare (FMT_SYS.ROM, FMT_SYS_A.ROM, FMTHR_SYS.ROM), (FMT_DOS.ROM, FMT_DOS_A.ROM),\n(FMT_FNT.ROM), (FMT_DIC.ROM), (FMT_F20.ROM, FMT_F20_A.ROM), (MYTOWNS.ROM,\nMYTOWNSUX.ROM, MYTOWNSM2.ROM, MYTOWNSFTV.ROM, MYTOWNSHR.ROM) and (MAR_EX0.ROM\nto MAR_EX3.ROM) (src/media/firmware.cpp:28-42). Without separate files the\nMarty components are cut from MROM.M36 and MROM.M37, 2 MiB each\n(src/media/firmware.cpp:497-508): OS at 0 and the first three extension\nparts in M36, and the fourth extension part, 20-dot font at 0x80000,\ndictionary at 0x100000, font at 0x180000 and System ROM at 0x1C0000 in M37.\n\nEach component must have its exact size or it is rejected\n(src/media/firmware.cpp:530-612, src/common/defines.h:47-54): System\n256 KiB, OS 512 KiB, Font 256 KiB, Dictionary 512 KiB, 20-dot Font 512 KiB,\nSerial 32 bytes, Extension 2 MiB (four 512 KiB parts). System, OS, Font and\nDictionary are required. A missing 20-dot Font or Extension is replaced by\n0xFF, a missing Serial ROM is generated (src/media/firmware.cpp:73-163,\nsrc/media/firmware.cpp:258-261). The CRC32 of every component is looked up\nin game_db.h (src/media/firmware.cpp:165-182, src/media/game_db.h:303-335),\nand an unknown CRC only produces a warning. The Free FM Towns set is known by\nSystem 65DC3B1F, OS 43C18E92, Font 736D9CB1 and a blank Dictionary\n504BF849. The Marty slices are known by System 937311F6, OS 2BC2AF96,\nExtension E1A9FA72 and 20-dot Font 75660AAC.\n\nThe CMOS is written by the core next to the saves\n(platforms/libretro/libretro.cpp:2753-2767). It is state, not a file to\nobtain.\n", "profiled_date": "2026-10-17", "source": "https://github.com/drhelius/Geartowns", "source_commit": "25d2025be28e9fcc319f597a516f21e0778f770b", "systems": [ "fmtowns" ], "type": "libretro", "upstream": "https://github.com/drhelius/Geartowns" } } ], "kind": "emulators", "schema_version": 1 }