mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-04-13 12:22:33 -05:00
92 lines
3.7 KiB
YAML
92 lines
3.7 KiB
YAML
emulator: Geargrafx
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type: libretro
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core_classification: official_port
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source: "https://github.com/drhelius/Geargrafx"
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upstream: "https://github.com/drhelius/Geargrafx"
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profiled_date: "2026-03-23"
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core_version: "1.6.0"
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display_name: "NEC - PC Engine / SuperGrafx / CD (Geargrafx)"
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cores:
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- geargrafx
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systems:
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- nec-pc-engine
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- nec-supergrafx
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- nec-pc-engine-cd
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notes: |
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Geargrafx is a PC Engine / TurboGrafx-16 / SuperGrafx / CD-ROM emulator by
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Ignacio Sanchez (drhelius). HuCard games run without BIOS.
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CD-ROM games require a System Card BIOS from the system directory. The core
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option "geargrafx_cdrom_bios" selects which card: Auto (default, maps to
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syscard3.pce), System Card 1, System Card 2, System Card 3, or Game Express.
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load_bios() in libretro.cpp builds "{system_directory}/{filename}" and calls
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core->LoadBios(path, true) for the syscard, then always attempts to load
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gexpress.pce via core->LoadBios(path, false).
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LoadBios() in media.cpp reads the file, strips a 512-byte header if present,
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computes CRC32, and checks it against k_game_database entries flagged with
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GG_GAMEDB_BIOS_SYSCARD or GG_GAMEDB_BIOS_GAME_EXPRESS. If the CRC32 is not
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found, the BIOS is marked as "Unknown" and invalid, but loading still proceeds.
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Size is checked against expected constants and logged if wrong, but not enforced.
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Game Express CD-ROM games are auto-detected via CRC32 lookup in game_db.h
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(GG_GAMEDB_GAME_EXPRESS flag). Arcade Card games are also detected from
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game_db.h and enable extra 0x30000 bytes of Card RAM for Super CD-ROM mode.
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files:
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- name: "syscard3.pce"
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description: "Super CD-ROM System Card 3.0"
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size: 262144
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required: true
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validation: [size, crc32]
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source_ref: "libretro.cpp:453,471-473, media.cpp:241-307, defines.h:52, game_db.h:50,52"
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notes: >
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Default BIOS for CD-ROM games (cdrom_bios Auto or System Card 3).
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game_db.h recognizes Japan (CRC32 6D9A73EF) and USA (CRC32 2B5B75FE)
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variants under the same filename.
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- name: "syscard2.pce"
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description: "CD-ROM System Card 2.0"
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size: 262144
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required: false
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validation: [size, crc32]
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source_ref: "libretro.cpp:452,462-463, media.cpp:241-307, game_db.h:48-49,51"
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notes: >
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cdrom_bios = 'System Card 2'. For older CD-ROM2 titles. game_db.h
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recognizes three variants: v2.0 Japan (CRC32 52520BC6), v2.1 Japan
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(CRC32 283B74E0), and USA (CRC32 FF2A5EC3).
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- name: "syscard1.pce"
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description: "CD-ROM System Card 1.0 (Japan)"
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size: 262144
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required: false
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validation: [size, crc32]
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source_ref: "libretro.cpp:451,459-460, media.cpp:241-307, game_db.h:47"
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notes: >
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cdrom_bios = 'System Card 1'. Very early CD-ROM2 games only.
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CRC32 3F9F95A4.
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- name: "gexpress.pce"
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description: "Game Express CD Card"
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size: 32768
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required: false
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validation: [size, crc32]
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source_ref: "libretro.cpp:454,468-469,481-482, media.cpp:241-307, defines.h:53, game_db.h:53-54"
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notes: >
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Always loaded alongside the selected System Card BIOS (libretro.cpp:481).
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Required for Game Express CD-ROM titles. game_db.h recognizes Blue Version
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(CRC32 51A12D90) and Green Version (CRC32 16AAF05A).
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valid_bios_crc32:
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syscard:
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- { crc32: "3F9F95A4", name: "CD-ROM System Card 1.0 (J)" }
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- { crc32: "52520BC6", name: "CD-ROM System Card 2.0 (J)" }
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- { crc32: "283B74E0", name: "CD-ROM System Card 2.1 (J)" }
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- { crc32: "6D9A73EF", name: "Super CD-ROM System 3.0 (J)" }
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- { crc32: "FF2A5EC3", name: "TurboGrafx CD System Card 2.0 (USA)" }
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- { crc32: "2B5B75FE", name: "TurboGrafx CD Super System 3.0 (USA)" }
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game_express:
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- { crc32: "51A12D90", name: "Game Express Card Blue Version (J)" }
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- { crc32: "16AAF05A", name: "Game Express Card Green Version (J)" }
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