mirror of
https://github.com/Abdess/retroarch_system.git
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92 lines
3.8 KiB
YAML
92 lines
3.8 KiB
YAML
emulator: JollyCV
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type: libretro
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core_classification: official_port
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source: "https://github.com/libretro/jollycv"
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upstream: "https://gitlab.com/jgemu/jollycv"
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profiled_date: "2026-09-17"
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source_commit: "2790d59c7194d29e83f8603ffd7e9da17f11575e"
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upstream_commit: "18875ffdb1891cec04217cf02928af563a3af9d8"
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core_version: "2.1.0"
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display_name: "ColecoVision/CreatiVision/My Vision (JollyCV)"
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cores:
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- jollycv
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systems:
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- colecovision
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- creativision
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- myvision
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notes: |
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JollyCV emulates the ColecoVision (with Super Game Module), the VTech
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CreatiVision and the Nichibutsu My Vision. The libretro port and the
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Jolly Good build share the same src/ tree; only the front end differs.
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The libretro port picks the system from the file name
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(libretro/libretro.c:670-679): ".myv" is My Vision, ".rom" and ".bin"
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are looked up by MD5 in the CreatiVision table (src/jcv_db.c:109-176,
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reached through src/jollycv.c:118-120) and fall back to ColecoVision,
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".col" is ColecoVision. A CreatiVision image whose MD5 is not in the
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table runs as ColecoVision. Version 2.1.0 moved that table from
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libretro/gamedb.h into src/jcv_db.c so both builds share it.
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BIOS files are read from the front end's system directory, no
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subdirectory, as "<system_dir>/coleco.rom" or "<system_dir>/bioscv.rom"
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(libretro/libretro.c:696-716). jcv_bios_load_file (src/jollycv.c:406-432)
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opens the file, reads it whole and hands the buffer to
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jcv_coleco_bios_load or jcv_crvision_bios_load, which keep it only when
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the size is exactly SIZE_CVBIOS (8192) or SIZE_CRVBIOS (2048). The return
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value of that size check is dropped at src/jollycv.c:427, so a file of the
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wrong size passes the loader while the BIOS pointer stays NULL; the first
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BIOS read (src/jcv_coleco.c:281-282, src/jcv_crvision.c:443-444) then
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dereferences it. A missing file fails retro_load_game. My Vision loads no
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BIOS (libretro/libretro.c:717-719).
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The Jolly Good build reads the same two names from the front end's BIOS
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path (jg.c:463-481) and declares them through jg_get_bioslist with an
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MD5 each (jg.c:151-156). The core never compares those MD5; the reference
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front end hashes the file against them for a debug log only
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(jgrf src/jgrf.c:441-458). The md5: fields below carry these values.
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ColecoVision cartridges start with 0xAA55 to show the BIOS title screen or
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0x55AA to jump straight to the game vector (src/jcv_coleco.c:421-426).
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The MD5 database of ColecoVision games in src/jcv_db.c selects cartridge
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mappers and controller flags.
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files:
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- name: "coleco.rom"
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system: colecovision
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description: "ColecoVision BIOS"
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required: true
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size: 8192
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md5: "2c66f5911e5b42b8ebe113403548eee7"
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validation: [size]
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source_ref: "libretro/libretro.c:697-703, src/jollycv.c:406-432, src/jcv_coleco.c:402-410, jg.c:151-153"
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note: "Mapped at 0x0000-0x1FFF, replaced by the lower 8K of SGM RAM when the Super Game Module enables it. The MD5 is the value the JG bioslist declares; the core compares the size only."
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- name: "bioscv.rom"
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system: creativision
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description: "VTech CreatiVision BIOS ROM"
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required: true
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size: 2048
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md5: "3b1ef759d8e3fb4071582efd33dd05f9"
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validation: [size]
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source_ref: "libretro/libretro.c:707-713, src/jollycv.c:406-432, src/jcv_crvision.c:316-324, jg.c:154-155"
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note: "Mapped at 0xF800-0xFFFF. The MD5 is the value the JG bioslist declares; the core compares the size only."
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platform_details:
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colecovision:
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bios_filename: "coleco.rom"
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bios_size: 8192
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memory_map: "0x0000-0x1FFF"
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source_ref: "src/jcv_coleco.c:268-283"
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creativision:
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bios_filename: "bioscv.rom"
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bios_size: 2048
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memory_map: "0xF800-0xFFFF"
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source_ref: "src/jcv_crvision.c:316-318, 443-445"
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myvision:
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bios_required: false
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source_ref: "libretro/libretro.c:717-719"
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note: "No BIOS is loaded for My Vision."
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