feat: add 10 emulator profiles (batch 4)
blastem (MD, no BIOS needed), dosbox_pure (14 MT-32 ROMs + SF2),
desmume (NDS, 3 files all HLE), cap32 (CPC, all embedded),
mu (Palm OS, 5 ROMs), bk (Elektronika BK, 9 Soviet ROMs),
gearsystem (SMS/GG, 2 optional boot ROMs),
beetle_ngp (Neo Geo Pocket, pure HLE), beetle_wswan (WonderSwan, pure HLE),
galaksija (Yugoslav computer, all embedded)
51 total profiles. Cross-reference: 658 undeclared, 177 in repo.
2026-03-17 19:27:35 +01:00
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emulator: Gearsystem
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type: libretro
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source: "https://github.com/drhelius/Gearsystem"
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2026-03-18 05:15:51 +01:00
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profiled_date: "2026-03-18"
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2026-03-18 05:19:57 +01:00
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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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feat: add 10 emulator profiles (batch 4)
blastem (MD, no BIOS needed), dosbox_pure (14 MT-32 ROMs + SF2),
desmume (NDS, 3 files all HLE), cap32 (CPC, all embedded),
mu (Palm OS, 5 ROMs), bk (Elektronika BK, 9 Soviet ROMs),
gearsystem (SMS/GG, 2 optional boot ROMs),
beetle_ngp (Neo Geo Pocket, pure HLE), beetle_wswan (WonderSwan, pure HLE),
galaksija (Yugoslav computer, all embedded)
51 total profiles. Cross-reference: 658 undeclared, 177 in repo.
2026-03-17 19:27:35 +01:00
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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 has no BIOS support. IsBootromEnabled() in Memory.cpp explicitly
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returns false when a SG-1000 cartridge is detected.
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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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Note: gearcoleco, geargrafx, and gearlynx are separate emulators by the
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same author covering ColecoVision, PC Engine, and Atari Lynx respectively.
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They are not part of Gearsystem.
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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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description: "Master System boot ROM"
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required: false
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source_ref: "platforms/libretro/libretro.cpp:414 (load_bootroms)"
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notes: "Loaded from system directory. Core option gearsystem_bios_sms must be set to Enabled. No size or hash validation performed by the core."
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# --- Game Gear boot ROM (optional, behind gearsystem_bios_gg) ---
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- name: "bios.gg"
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system: sega-gamegear
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description: "Game Gear boot ROM"
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required: false
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source_ref: "platforms/libretro/libretro.cpp:415 (load_bootroms)"
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notes: "Loaded from system directory. Core option gearsystem_bios_gg must be set to Enabled. No size or hash validation performed by the core."
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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:222-228"
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notes: |
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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:230-234"
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notes: |
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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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notes: |
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No BIOS support. Memory.cpp:291 returns false from IsBootromEnabled()
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when IsSG1000() is true.
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