mirror of
https://github.com/Abdess/retroarch_system.git
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Abdessamad Derraz
59e403bd3f
Same four files. A CD BIOS outside the two CRC32 constants is accepted on a plausible run address (libretro.c:5706-5781), and a custom cart boot ROM must be exactly 131072 bytes (libretro.c:6010-6050). core_version follows CORE_BASE_VERSION in the Makefile.
192 lines
7.6 KiB
YAML
192 lines
7.6 KiB
YAML
emulator: Virtual Jaguar
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type: libretro
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core_classification: community_fork
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source: "https://github.com/libretro/virtualjaguar-libretro"
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upstream: "http://shamusworld.gotdns.org/git/virtualjaguar"
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profiled_date: "2026-09-04"
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source_commit: "e7db53678b86e2fceb459e26cf09d2fdaaa4d395"
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core_version: "v3.10.0"
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display_name: "Atari - Jaguar (Virtual Jaguar)"
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cores:
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- virtualjaguar
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systems:
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- atari-jaguar
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notes: |
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The boot ROMs are compiled in, generated by bin2c, and a file in the system
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directory can replace them. stage_cart_boot_rom stages the cart boot ROM at
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jagMemSpace + 0xE00000 (libretro.c:6105-6180). BT_M_SERIES reads
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jagboot_m.rom from the system directory, and a read shorter than 0x20000
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bytes leaves the embedded Model M in place. BT_CUSTOM searches six names
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across the system directory and two subdirectories (libretro.c:6059-6103),
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takes the first file of exactly 0x20000 bytes, and falls back to the
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embedded Series K when none qualifies (libretro.c:6010-6050).
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stage_cd_bios calls load_external_cd_bios, which walks three name groups
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over five directories (libretro.c:5785-5884, 5899-5940). The group order
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follows the virtualjaguar_cd_bios_type option, then generic names, then the
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other type, so a lone file of the other type still beats the embedded copy.
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A candidate must be exactly 0x40000 bytes. Its CRC32 is compared with two
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constants, and a file matching neither is still accepted when the run
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address at 0x404 lies between 0x800000 and 0x840000
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(libretro.c:5681-5682,5706-5781).
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The "BIOS (Cartridges)" core option (virtualjaguar_bios, disabled by
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default) controls whether the boot ROM runs at startup. When enabled, the
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boot ROM entry point is copied to jaguarMainRAM
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(src/core/jaguar.c:1499-1501). When disabled, jaguarRunAddress is written
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directly, skipping the boot animation. GPU-only cartridges turn the boot
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ROM on regardless (libretro.c:5968-6002).
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Nothing here is required: every path falls back to an embedded copy, and a
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file only replaces it. The embedded arrays are the dumps themselves:
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jaguarBootROM and jaguarBootROM_M hash to the CRC32 values biosdb.c names
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Series K and Model M, jaguarCDBootROM and jaguarDevCDBootROM to the two
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values the CD BIOS test accepts (src/bios/jagbios.c, src/bios/jagbios_m.c,
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src/bios/jagcdbios.c, src/bios/jagdevcdbios.c, src/core/biosdb.c:20-21,
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libretro.c:5681-5682). A file changes what runs when it is a cart boot ROM
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under BT_CUSTOM, where any checksum is loaded and an unrecognised one is
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logged (libretro.c:6010-6050), or a CD BIOS revision outside the two
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checksums.
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files:
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- name: "[BIOS] Atari Jaguar CD (World).j64"
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system: atari-jaguar
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required: false
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size: 262144
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crc32: "687068d5"
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validation: [size, crc32]
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aliases:
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- "[BIOS] Atari Jaguar CD (World).rom"
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- "[BIOS] Atari Jaguar CD (World).bin"
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- "jaguarcd_bios.bin"
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- "jagcd_bios.bin"
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- "jaguarcd.bin"
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- "jagcd.bin"
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- "Jaguar CD BIOS.rom"
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- "Jaguar CD BIOS.bin"
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description: "Jaguar CD retail BIOS, replacing the embedded copy"
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source_ref: "libretro.c:5681, libretro.c:5706-5781, libretro.c:5785-5884, libretro.c:5899-5940"
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note: >-
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Searched in the system directory and under Atari - Jaguar,
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Atari - Jaguar CD, jaguar and jaguarcd. Accepted at exactly 262144
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bytes. A file whose CRC32 matches neither constant is still accepted
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when its run address at 0x404 lies between 0x800000 and 0x840000,
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otherwise it is rejected and the search goes on. The generic names are
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tried after the type the virtualjaguar_cd_bios_type option selects.
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- name: "[BIOS] Atari Jaguar Developer CD (World).j64"
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system: atari-jaguar
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required: false
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size: 262144
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crc32: "55a0669c"
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validation: [size, crc32]
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aliases:
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- "[BIOS] Atari Jaguar Developer CD (World).rom"
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- "[BIOS] Atari Jaguar Developer CD (World).bin"
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description: "Jaguar CD developer BIOS, selected by virtualjaguar_cd_bios_type"
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source_ref: "libretro.c:5682, libretro.c:5706-5781, libretro.c:5785-5884"
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note: >-
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Same search and the same size and checksum test as the retail BIOS.
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Whichever type the option does not select is still tried last.
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- name: jagboot.rom
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system: atari-jaguar
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required: false
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size: 131072
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validation: [size]
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aliases:
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- boot.rom
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- boot0.rom
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- "[BIOS] Atari Jaguar (World).j64"
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- "[BIOS] Atari Jaguar Stubulator '94 (World).j64"
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- "[BIOS] Atari Jaguar Stubulator '93 (World).j64"
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description: "Cart boot ROM read when the BIOS type is set to custom"
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source_ref: "libretro.c:6010-6050, libretro.c:6059-6103, libretro.c:6131-6147"
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note: >-
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Reached only through BT_CUSTOM. Searched in the system directory and
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under Atari - Jaguar and jaguar, name by name. No checksum is tested. A
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file that is not exactly 131072 bytes is skipped, and with none left the
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embedded Series K is used.
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- name: jagboot_m.rom
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system: atari-jaguar
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required: false
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size: 131072
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validation: [size]
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sha1: "af643900fea84234e08b616a6d27f03f0a61db96"
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md5: "6e844759720226e58d55ecaf33608a13"
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crc32: "ae25bdf5"
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description: "Model-M cart boot ROM, read when the BIOS type is Model M"
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source_ref: "libretro.c:6149-6171, src/bios/jagbios_m.c:9"
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note: >-
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Read from the system directory only, as jagboot_m.rom, and only when
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biosType is BT_M_SERIES. A short read falls back to the embedded
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Model M array, which carries the same bytes as the Model M dump.
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analysis:
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embedded_bios:
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k_series_boot_rom:
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source_file: src/bios/jagbios.c
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header: src/bios/jagbios.h
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symbol: jaguarBootROM
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size: 131072 # 0x20000, 128 KB
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description: "Jaguar K-series boot ROM"
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filedb_crc: "0xFB731AAA"
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filedb_name: "[BIOS] Atari Jaguar (World)"
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m_series_boot_rom:
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source_file: src/bios/jagbios_m.c
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header: src/bios/jagbios_m.h
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symbol: jaguarBootROM_M
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size: 131072 # 0x20000, 128 KB
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description: "Jaguar M-series boot ROM"
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biosdb_crc: "0xAE25BDF5"
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biosdb_name: "Model M boot ROM"
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cd_boot_rom:
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source_file: src/bios/jagcdbios.c
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header: src/bios/jagcdbios.h
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symbol: jaguarCDBootROM
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size: 262144 # 0x40000, 256 KB
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description: "Jaguar CD boot ROM"
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filedb_crc: "0x687068D5"
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filedb_name: "[BIOS] Atari Jaguar CD (World)"
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dev_cd_boot_rom:
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source_file: src/bios/jagdevcdbios.c
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header: src/bios/jagdevcdbios.h
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symbol: jaguarDevCDBootROM
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size: 262144 # 0x40000, 256 KB
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description: "Jaguar Developer CD boot ROM"
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filedb_crc: "0x55A0669C"
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filedb_name: "[BIOS] Atari Jaguar Developer CD (World)"
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bios_type_enum:
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source_ref: "src/core/settings.h:66"
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values:
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- BT_K_SERIES
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- BT_M_SERIES
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- BT_STUBULATOR_1
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- BT_STUBULATOR_2
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- BT_CUSTOM
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core_option:
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key: virtualjaguar_bios
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label: "BIOS (Cartridges)"
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description: "Which BIOS a cartridge boots with: disabled is HLE, enabled runs the boot ROM."
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default: disabled
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source_ref: "libretro_core_options.h:589-601"
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bios_loading:
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mechanism: embedded
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load_address: "0xE00000"
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load_size: "0x20000"
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source_ref: "libretro.c:6105-6180, libretro.c:7237"
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selection_logic: "BT_CUSTOM reads a file, BT_M_SERIES tries jagboot_m.rom, otherwise the embedded array"
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external_loading: true
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note: |
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jagBootPath and CDBootPath struct fields are never set in the libretro
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port. The standalone Virtual Jaguar GUI uses them but that code path
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is not compiled into the libretro core.
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