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https://github.com/Abdess/retroarch_system.git
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e13e8734b9
240 file-level entries used notes: instead of the canonical note: field. verify.py and cross_reference.py only read note:, so these were silently ignored.
65 lines
2.1 KiB
YAML
65 lines
2.1 KiB
YAML
emulator: Gearsystem
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type: libretro
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core_classification: official_port
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source: "https://github.com/drhelius/Gearsystem"
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upstream: "https://github.com/drhelius/Gearsystem"
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profiled_date: "2026-03-23"
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core_version: "3.2.0"
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display_name: "Sega - MS/GG/SG-1000 (Gearsystem)"
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cores:
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- gearsystem
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systems:
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- sega-mastersystem
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- sega-gamegear
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- sega-sg1000
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notes: |
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Gearsystem is a Sega Master System / Game Gear / SG-1000 emulator by
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Ignacio Sanchez (drhelius). No BIOS is required for normal operation.
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The core supports optional boot ROMs for Master System and Game Gear,
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controlled by core options "gearsystem_bios_sms" and "gearsystem_bios_gg"
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(both disabled by default). Boot ROMs are loaded in load_bootroms()
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from the system directory with fixed filenames.
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SG-1000 and Game Gear in SMS mode have no BIOS support.
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IsBootromEnabled() returns false for both cases.
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When enabled, the boot ROM executes as on original hardware, which may
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cause invalid ROMs to lock or fail to boot entirely.
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files:
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# --- Master System boot ROM (optional, behind gearsystem_bios_sms) ---
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- name: "bios.sms"
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system: sega-mastersystem
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required: false
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source_ref: "platforms/libretro/libretro.cpp:414,417 (load_bootroms)"
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- name: "bios.gg"
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system: sega-gamegear
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required: false
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source_ref: "platforms/libretro/libretro.cpp:415,418 (load_bootroms)"
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platform_details:
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mastersystem:
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bios_filename: "bios.sms"
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source_ref: "src/Memory.cpp:223-228"
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note: |
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Boot ROM loaded via LoadBootromSMS() -> LoadBootroom(path, false).
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Raw binary read, stored in m_pBootromSMS. Bank count computed as
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Pow2Ceil(size / 0x4000). Memory mapping controlled by port 3E bit 3.
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gamegear:
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bios_filename: "bios.gg"
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source_ref: "src/Memory.cpp:230-235"
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note: |
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Boot ROM loaded via LoadBootromGG() -> LoadBootroom(path, true).
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Raw binary read, stored in m_pBootromGG. Same bank computation.
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Supports standard GG BIOS and Majesco 1KB variant.
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sg1000:
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bios_filename: null
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note: |
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No BIOS support. Memory.cpp:291 returns false from IsBootromEnabled()
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when IsSG1000() or IsGameGearInSMSMode() is true.
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