mirror of
https://github.com/Abdess/retroarch_system.git
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99 lines
4.8 KiB
YAML
99 lines
4.8 KiB
YAML
emulator: Gearcoleco
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type: libretro
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core_classification: official_port
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source: "https://github.com/drhelius/Gearcoleco"
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upstream: "https://github.com/drhelius/Gearcoleco"
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profiled_date: "2026-09-17"
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source_commit: "8d32d242c6ba2104d75c17bb79773275387d4c37"
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core_version: "1.7.0-7-g8d32d24"
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display_name: "Coleco - ColecoVision / ADAM (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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- coleco-adam
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notes: |
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ColecoVision and Coleco ADAM emulator by Ignacio Sanchez (drhelius); the
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libretro port lives in the same repository. Three firmware roles are
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declared in kAdamFirmwareMetadata (src/Adam.cpp:26-42): OS-7, EOS and
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SmartWriter, each with a size, a CRC32 and its accepted file names.
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find_firmware() (platforms/libretro/libretro.cpp:773-834) walks the
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frontend system directory and then its gearcoleco subdirectory
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(libretro.cpp:787), trying every accepted name in each. A file whose size
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differs from the role's size is skipped with a warning (libretro.cpp:806-811).
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Every candidate that passes is compared to the first one found: two
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valid-sized images with different bytes are an ambiguous role and the load
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fails (libretro.cpp:820-827). CRC32 is computed after the search and only
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logged when it differs from the table (libretro.cpp:867-870, 918-929).
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The machine is chosen per load (libretro.cpp:2387-2389): .ddp, .dsk, a ZIP
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holding an ADAM image, an .m3u playlist, no content at all, or a cartridge
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with the core option gearcoleco_cartridge_hardware set to ADAM start the
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ADAM; any other cartridge starts the ColecoVision. The "adam" subsystem
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(libretro.cpp:529-537) takes a cartridge, two disks and two data packs.
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ColecoVision: load_colecovision_firmware() (libretro.cpp:852-879) needs OS-7
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and retro_load_game() returns false without it (libretro.cpp:2399-2403).
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It runs again on retro_reset() (libretro.cpp:2204-2205). The image goes
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through Memory::LoadBiosFromBuffer() (src/Memory.cpp:310-319) and byte 0x69
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is patched on reset, 0x32 when the cartridge is PAL and 0x3C otherwise
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(src/Memory.cpp:246-249); the ADAM always gets 0x3C (src/Memory.cpp:221).
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ADAM: load_adam_firmware() (libretro.cpp:881-942) needs all three roles and
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every ADAM entry point returns false when one is missing (libretro.cpp:
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2372-2373, 2429-2433, 2446-2447, 2530-2534). Adam::LoadFirmware()
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(src/Adam.cpp:168-190) copies the three images, IsFirmwareReady()
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(src/Adam.cpp:139-148) gates StartAdam() (src/GearcolecoCore.cpp:410-415).
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The MIOC maps SmartWriter over the lower 32 KiB with EOS replacing its
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last 8 KiB bank when the control latch selects it, and OS-7 over the first
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8 KiB in cartridge mode (src/Adam.cpp:531-555).
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Save RAM, save states and IPS patches are read next to the content or in
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the frontend save directory; they are state the core writes, not files a
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user obtains.
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files:
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- name: "colecovision.rom"
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aliases: ["coleco.rom", "os7.u2"]
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description: "ColecoVision OS-7 BIOS"
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system: colecovision
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required: true
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size: 8192
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crc32: "3aa93ef3"
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sha1: "45bedc4cbdeac66c7df59e9e599195c778d86a92"
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validation: [size, crc32]
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source_ref: "platforms/libretro/libretro.cpp:773-834 (find_firmware), 852-879 (load_colecovision_firmware), 2399-2403, 2204-2205, src/Adam.cpp:28-32, src/Adam.h:53, src/Memory.cpp:310-319, src/Memory.cpp:246-249"
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note: >
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Loaded for both machines. Any 8192-byte image is accepted; a CRC32
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other than 3aa93ef3 logs "Unknown OS-7 revision" and runs. PAL timing
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comes from the byte patched at 0x69, not from a PAL dump.
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- name: "eos.rom"
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description: "ADAM EOS (Elementary Operating System) ROM"
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system: coleco-adam
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required: true
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size: 8192
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crc32: "05a37a34"
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validation: [size, crc32]
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source_ref: "platforms/libretro/libretro.cpp:881-942 (load_adam_firmware), 2372-2373, 2429-2433, 2446-2447, 2530-2534, src/Adam.cpp:33-36, src/Adam.h:54, src/Adam.cpp:139-148, src/Adam.cpp:168-190, src/GearcolecoCore.cpp:410-415, src/Adam.cpp:537-540"
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note: >
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The 8 KiB EOS bank, the first half of the 16 KiB u22 chip; a CRC32
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other than 05a37a34 logs "Unknown EOS revision" and runs. Only the ADAM
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needs it: ColecoVision cartridges load without it.
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- name: "writer.rom"
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aliases: ["wp.rom", "wp_r80.rom"]
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description: "ADAM SmartWriter word processor ROM"
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system: coleco-adam
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required: true
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size: 32768
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crc32: "58d86a2a"
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sha1: "d4aec4efe1431e56fe52d83baf9118542c525255"
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validation: [size, crc32]
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source_ref: "platforms/libretro/libretro.cpp:881-942 (load_adam_firmware), 2372-2373, 2429-2433, 2446-2447, 2530-2534, src/Adam.cpp:37-41, src/Adam.h:55, src/Adam.cpp:139-148, src/Adam.cpp:168-190, src/GearcolecoCore.cpp:410-415, src/Adam.cpp:531-540"
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note: >
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A CRC32 other than 58d86a2a logs "Unknown SmartWriter revision" and
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runs. Only the ADAM needs it: ColecoVision cartridges load without it.
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