mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-10-21 03:09:08 -05:00
Abdessamad Derraz
b3b3880c19
Profiles that read two repositories, a libretro port and its upstream, now prefix each citation with source or upstream, decided by which tree carries the cited value at its pin. The emulator pages use the word to tell libretro glue, emulator code as the port carries it, and the upstream emulator apart.
165 lines
6.3 KiB
YAML
165 lines
6.3 KiB
YAML
emulator: Genesis Plus GX
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type: libretro
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core_classification: community_fork
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source: "https://github.com/libretro/Genesis-Plus-GX"
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upstream: "https://github.com/ekeeke/Genesis-Plus-GX"
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profiled_date: "2026-03-23"
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source_commit: "58c341487e5bfcf979ea68413c7987633adb0c56"
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core_version: "v1.7.4"
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display_name: "Sega - MS/GG/MD/CD (Genesis Plus GX)"
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cores:
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- genesis_plus_gx
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- genesisplusgx
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- genplus
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- "genesisplusgx_ex"
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systems:
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- sega-megadrive
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- sega-megacd
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- sega-mastersystem
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- sega-gamegear
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- sega-sg1000
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- sega-pico
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notes: |
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Genesis Plus GX is a Sega 8/16-bit emulator covering SG-1000, Master System,
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Game Gear, Mega Drive/Genesis, and Mega CD/Sega CD.
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BIOS loading is handled by load_bios() in core/loadrom.c. The libretro port
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resolves filenames from the system directory in libretro/libretro.c:3516-3527.
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Mega CD BIOS is required to boot CD images (load fails without it).
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Master System, Game Gear, and Mega Drive BIOS files are optional boot ROMs
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gated behind the "genesis_plus_gx_bios" core option (config.bios).
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Lock-on ROMs (Game Genie, Action Replay, Sonic & Knuckles) are optional
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and loaded only when the corresponding lock-on feature is enabled.
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files:
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# -------------------------------------------------------
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# Sega Mega CD / Sega CD - boot ROMs (required for CD)
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# -------------------------------------------------------
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- name: bios_CD_U.bin
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system: sega-megacd
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region: [north-america, latin-america]
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required: true
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note: "Sega CD (NTSC-U) boot ROM. Loaded for REGION_USA, which get_region sets for every disc whose security byte is neither 0x64 (Europe) nor 0xa1 (Japan) (core/loadrom.c:1065-1078)."
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source_ref: "source core/loadrom.c:409"
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- name: bios_CD_E.bin
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system: sega-megacd
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region: [europe, oceania]
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required: true
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note: "Mega CD (PAL) boot ROM. Loaded for REGION_EUROPE, set by security byte 0x64 at 0x20b, the only PAL branch for Australian discs (core/loadrom.c:1065-1069)."
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source_ref: "source core/loadrom.c:412"
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- name: bios_CD_J.bin
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system: sega-megacd
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region: [japan]
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required: true
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note: "Mega CD (NTSC-J) boot ROM. Loaded for default/Japan region."
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source_ref: "source core/loadrom.c:415"
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# -------------------------------------------------------
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# Sega Master System - boot ROMs (optional, behind config.bios)
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# -------------------------------------------------------
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- name: bios_U.sms
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system: sega-mastersystem
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region: [north-america, europe]
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required: false
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note: "Master System (NTSC-U) boot ROM. Snail maze game built in. REGION_USA is the default of sms_cart_region_detect for any export header outside the PAL CRC list, so European cartridges load it too (core/cart_hw/sms_cart.c:831-874)."
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source_ref: "source core/loadrom.c:511"
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- name: bios_E.sms
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system: sega-mastersystem
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required: false
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note: "Master System (PAL) boot ROM. Snail maze / Sonic built in. REGION_EUROPE comes only from CRC lists of Codemasters and PAL-timing games, Brazilian ones included, or the PAL option (core/cart_hw/sms_cart.c:167-171, 245-264, core/loadrom.c:1161-1164)."
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source_ref: "source core/loadrom.c:514"
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- name: bios_J.sms
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system: sega-mastersystem
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region: [japan]
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required: false
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note: "Master System (NTSC-J) boot ROM."
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source_ref: "source core/loadrom.c:517"
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# -------------------------------------------------------
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# Sega Game Gear - boot ROM (optional, behind config.bios)
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# -------------------------------------------------------
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- name: bios.gg
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system: sega-gamegear
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required: false
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note: "Game Gear boot ROM (Majesco 1KB or standard). Shows startup logo."
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source_ref: "source core/loadrom.c:480"
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# -------------------------------------------------------
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# Sega Mega Drive / Genesis - TMSS boot ROM (optional)
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# -------------------------------------------------------
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- name: bios_MD.bin
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system: sega-megadrive
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required: false
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note: "Mega Drive TMSS boot ROM. Shows 'Produced by or under license' screen."
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source_ref: "source libretro/libretro.c:3780"
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# -------------------------------------------------------
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# Lock-on ROMs (optional, feature-gated)
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# -------------------------------------------------------
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- name: ggenie.bin
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system: sega-megadrive
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required: false
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note: "Game Genie ROM. Loaded when Game Genie lock-on is enabled."
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source_ref: "source core/cart_hw/ggenie.c:64, source libretro/libretro.c:3516"
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- name: areplay.bin
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system: sega-megadrive
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required: false
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note: "Action Replay (Pro) ROM. Loaded when Action Replay lock-on is enabled."
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source_ref: "source core/cart_hw/areplay.c:64, source libretro/libretro.c:3517"
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- name: sk.bin
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system: sega-megadrive
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required: false
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size: 2097152
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validation: [size]
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note: "Sonic & Knuckles ROM. Required for S&K lock-on feature."
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source_ref: "source core/cart_hw/md_cart.c:867"
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- name: sk2chip.bin
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system: sega-megadrive
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required: false
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size: 262144
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validation: [size]
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note: "Sonic & Knuckles UPMEM ROM. Used by Sonic 2 & Knuckles lock-on."
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source_ref: "source core/cart_hw/md_cart.c:873"
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platform_details:
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megacd:
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bootrom_size: 131072 # 128 KB
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source_ref: "source core/cd_hw/scd.h:73"
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note: |
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CD boot ROM region is auto-detected from disc image header.
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Hardware model detected from boot ROM string at offset 0x120:
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WONDER-MEGA BOOT -> Wondermega
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WONDERMEGA2 BOOT -> Wondermega M2 / X'Eye
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CDX BOOT ROM -> CDX / Multi-Mega
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megadrive:
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tmss_rom_size: 2048 # 2 KB
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source_ref: "source libretro/libretro.c:3648-3666"
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note: |
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TMSS boot ROM validated by checking "GENESIS OS" at offset 0x120.
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Only loaded when genesis_plus_gx_bios core option is enabled.
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mastersystem:
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bios_max_size: 4194304 # 4 MB (stored above cart ROM)
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source_ref: "source core/loadrom.c:504-527"
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note: |
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BIOS ROM loaded into cart.rom + 0x400000. SEGA mapper assumed
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for ROMs larger than 48KB, otherwise no mapper.
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Region selected based on current region_code setting.
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gamegear:
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bios_max_size: 4194304 # 4 MB (stored above cart ROM)
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source_ref: "source core/loadrom.c:467-489"
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note: |
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Handles 1KB Majesco GG BIOS (mapped to $0000-$03FF) and
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standard larger BIOS ROMs.
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