mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-04-13 12:22:33 -05:00
ff82f64cb6
Final batch: scummvm (55 files, MT-32/engine data/themes/shaders), gearcoleco (colecovision.rom), geargrafx (4 syscard variants), gearlynx (lynxboot.img), dosbox_core (MT-32 + BASS libs), geolith (Neo Geo FPGA, aes.zip/neogeo.zip), retrodream (DC boot+flash), noods (NDS, full HLE), freej2me (JAR), jollycv (coleco+creativision), fixgb (gbc_bios), numero (TI-83), smsplus (SMS/GG/CV), vircon32 95 profiles covering every libretro core with firmware requirements. Cross-reference: 803 undeclared files, 249 in repo, 554 to source.
57 lines
2.0 KiB
YAML
57 lines
2.0 KiB
YAML
emulator: Gearcoleco
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type: libretro
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source: "https://github.com/drhelius/Gearcoleco"
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cores:
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- gearcoleco
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systems:
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- colecovision
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notes: |
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Gearcoleco is a ColecoVision emulator by Ignacio Sanchez (drhelius).
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The ColecoVision BIOS ROM is required to run games. Without it, the
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core displays a static "no BIOS" placeholder image (kNoBiosImage from
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no_bios.h) and games will not execute.
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The BIOS is loaded in load_bootroms() (libretro.cpp:293-305) from the
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system directory. The core first tries "colecovision.rom", then falls
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back to "coleco.rom" if the first file is not found.
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Memory.cpp:LoadBios() validates the file size must be exactly 8192
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bytes (0x2000). No hash check is performed by the core itself.
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On reset, the BIOS byte at offset 0x69 is patched to select region:
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0x3C for NTSC, 0x32 for PAL (Memory.cpp:184-187).
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The core also supports Super Game Module (SGM) expanded RAM but that
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requires no additional BIOS files.
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files:
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# --- ColecoVision BIOS (required) ---
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- name: "colecovision.rom"
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system: colecovision
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description: "ColecoVision BIOS ROM"
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required: true
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size: 8192
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source_ref: "platforms/libretro/libretro.cpp:297 (load_bootroms)"
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notes: "Primary filename. Loaded via Memory::LoadBios(), must be exactly 8192 bytes."
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- name: "coleco.rom"
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system: colecovision
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description: "ColecoVision BIOS ROM (legacy filename)"
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required: false
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size: 8192
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source_ref: "platforms/libretro/libretro.cpp:303 (load_bootroms fallback)"
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notes: "Fallback filename tried when colecovision.rom is not found."
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platform_details:
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colecovision:
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bios_filename: "colecovision.rom"
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bios_fallback: "coleco.rom"
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bios_size: 8192
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source_ref: "src/Memory.cpp:228-258"
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notes: |
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LoadBios() reads the file as raw binary. Size must be exactly 0x2000
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(8192 bytes) or the load is rejected with a log message. The BIOS is
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mapped at address 0x0000-0x1FFF in the ColecoVision memory map. On
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reset, byte 0x69 is patched for NTSC/PAL region selection.
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