mirror of
https://github.com/Abdess/retroarch_system.git
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Abdessamad Derraz
315dab82b7
Three changes to the search-list model, one commit because the readers
and the profiles must move together for the schema to hold.
Set requirement in a groups map. pom2 falls back on apple2.rom for the
][ and the ][+, and on apple2e.rom for the //e it boots and for the
unenhanced //e: one required on the file could not say both. A profile
now declares groups: {name: {required}}, a member writes no required
of its own (schema and validate_schemas refuse one) and load_emulator_
profiles derives it, true when one of its sets is. group takes a name,
a list, or a map from set to rank where the rank differs per set. pom2
is grouped from SystemProfile.cpp and MainWindow.cpp:246-296 at its pin.
One member per required set under --required-only. The pick is the
first the code reads among the held members the region filter leaves,
by rank then declaration order; a set the platform declares a member
of is carried by that declaration. The emulator pack, verify
--emulator, the platform pack, its manifest and verify --platform read
alternatives.required_only_spares or core_file_spares.
variant_group is now selection_slot: files a core chooses between by
a rule other than first found (disc territory for PicoDrive and
Pizza Boy SC, the o2em_bios option, a WebAssembly probe in SWF
Player). Where the code takes any one, the field became a group:
ARMSX1 (ArmSxBackend.java:149-157, name order), ePSXe (load_bios
0x433540-0x433621 of the 2.0.5 Linux x64 binary, one configured path,
HLE when BiosHLE is set), FPse and FPse-NG, DXX-Rebirth's HOGs
(inferno.cpp:472-512). odin and zesarux carried it with no effect.
slot.py compares ranks only between candidates that share a set.
250 lines
8.5 KiB
YAML
250 lines
8.5 KiB
YAML
emulator: PicoDrive
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type: libretro
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core_classification: official_port
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source: "https://github.com/libretro/picodrive"
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upstream: "https://github.com/irixxxx/picodrive"
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profiled_date: "2026-03-24"
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source_commit: "1890c2932234c9d30f4cd3851d02228baae8f09e"
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upstream_commit: "5f9e79f2177443939f21ab965b1c294edbef514c"
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core_version: "2.05"
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version_basis:
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kind: file
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path: "platform/common/version.h"
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pattern: '#define\s+VERSION\s+"([^"]+)"'
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display_name: "Sega - MS/GG/MD/CD/32X (PicoDrive)"
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cores: [picodrive]
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systems:
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- sega-megadrive
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- sega-genesis
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- sega-megacd
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- sega-megacd
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- sega-32x
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- sega-mastersystem
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- sega-gamegear
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- sega-sg1000
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- sega-sc3000
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- sega-pico
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notes: |
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PicoDrive is a fast Mega Drive / Genesis emulator with Mega CD, 32X, Master
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System, Game Gear, SG-1000, SC-3000 and Sega Pico support. The libretro port
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is part of the PicoDrive source tree (platform/libretro/).
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Mega CD / Sega CD games require a region-matching BIOS file. The core searches
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the system directory for each name in order, trying .bin then .zip extension,
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and uses the first file found. If no BIOS is found, CD games fail to load with
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PM_BAD_CD_NO_BIOS. MSU-MD games can run without BIOS.
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BIOS filename search order (platform/libretro/libretro.c:1272-1336):
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US: us_scd2_9306, SegaCDBIOS9303, us_scd1_9210, bios_CD_U
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EU: eu_mcd2_9306, eu_mcd2_9303, eu_mcd1_9210, bios_CD_E
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JP: jp_mcd2_921222, jp_mcd1_9112, jp_mcd1_9111, bios_CD_J
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32X BIOS files (m68k, master SH2, slave SH2) are fully optional. The engine
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has built-in HLE that generates replacement code at startup when the BIOS
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pointers are NULL (pico/32x/memory.c:2202 get_bios(), pico/32x/32x.c:172).
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No current frontend (libretro or standalone) loads these files, and the standalone
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loading code is disabled (#if 0 in platform/common/emu.c:1530).
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carthw.cfg is a cartridge hardware database loaded from the system directory.
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A built-in version is compiled into the core (pico/carthw_cfg.c). The external
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file supplements or overrides game-specific hardware detection (SVP, EEPROM
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types, special mappers, copy protection).
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Master System, Game Gear, SG-1000, SC-3000: no BIOS file loaded. The core
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initializes VDP registers and RAM to simulate post-BIOS state
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(pico/sms.c:1080-1097).
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groups:
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mega-cd-us:
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required: true
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mega-cd-eu:
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required: true
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mega-cd-jp:
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required: true
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files:
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# -------------------------------------------------------
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# Cartridge hardware database
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# -------------------------------------------------------
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- name: "carthw.cfg"
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required: false
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note: "Cartridge hardware database for special mapper and EEPROM detection. Built-in fallback compiled into the core."
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source_ref: "source platform/libretro/libretro.c:1627, source pico/cart.c:1020-1022"
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# -------------------------------------------------------
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# Mega CD / Sega CD - US region
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# -------------------------------------------------------
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- name: "us_scd2_9306.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [north-america, latin-america]
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group: mega-cd-us
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priority: 1
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size: 131072 # 128 KB (0x20000)
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note: "US Sega CD Model 2 BIOS (September 1993). First in US search order. The US list serves every disc whose security byte is neither 0x64 nor 0xa1 (pico/cd/cd_image.c:190, 247-248)."
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source_ref: "source platform/libretro/libretro.c:1273"
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- name: "SegaCDBIOS9303.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [north-america, latin-america]
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group: mega-cd-us
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priority: 2
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size: 131072
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note: "US Sega CD BIOS (March 1993). Second in US search order."
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source_ref: "source platform/libretro/libretro.c:1273"
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- name: "us_scd1_9210.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [north-america, latin-america]
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group: mega-cd-us
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priority: 3
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size: 131072
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note: "US Sega CD Model 1 BIOS (October 1992). Third in US search order."
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source_ref: "source platform/libretro/libretro.c:1273"
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- name: "bios_CD_U.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [north-america, latin-america]
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group: mega-cd-us
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priority: 4
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size: 131072
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note: "US Sega CD BIOS (generic name). Last in US search order."
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source_ref: "source platform/libretro/libretro.c:1273"
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# -------------------------------------------------------
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# Mega CD / Sega CD - EU region
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# -------------------------------------------------------
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- name: "eu_mcd2_9306.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [europe, oceania]
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group: mega-cd-eu
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priority: 1
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size: 131072
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note: "EU Mega CD Model 2 BIOS (June 1993). First in EU search order, used when security byte 0x20b is 0x64, the only PAL branch for Australian discs (pico/media.c:243-247, platform/libretro/libretro.c:1306-1308)."
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source_ref: "source platform/libretro/libretro.c:1276"
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- name: "eu_mcd2_9303.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [europe, oceania]
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group: mega-cd-eu
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priority: 2
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size: 131072
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note: "EU Mega CD Model 2 BIOS (March 1993). Second in EU search order."
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source_ref: "source platform/libretro/libretro.c:1276"
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- name: "eu_mcd1_9210.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [europe, oceania]
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group: mega-cd-eu
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priority: 3
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size: 131072
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note: "EU Mega CD Model 1 BIOS (October 1992). Third in EU search order."
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source_ref: "source platform/libretro/libretro.c:1276"
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- name: "bios_CD_E.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [europe, oceania]
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group: mega-cd-eu
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priority: 4
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size: 131072
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note: "EU Mega CD BIOS (generic name). Last in EU search order."
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source_ref: "source platform/libretro/libretro.c:1276"
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# -------------------------------------------------------
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# Mega CD / Sega CD - JP region
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# -------------------------------------------------------
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- name: "jp_mcd2_921222.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [japan]
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group: mega-cd-jp
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priority: 1
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size: 131072
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note: "JP Mega CD Model 2 BIOS (December 1992). First in JP search order."
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source_ref: "source platform/libretro/libretro.c:1279"
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- name: "jp_mcd1_9112.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [japan]
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group: mega-cd-jp
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priority: 2
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size: 131072
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note: "JP Mega CD Model 1 BIOS (December 1991). Second in JP search order."
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source_ref: "source platform/libretro/libretro.c:1279"
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- name: "jp_mcd1_9111.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [japan]
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group: mega-cd-jp
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priority: 3
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size: 131072
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note: "JP Mega CD Model 1 BIOS (November 1991). Third in JP search order."
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source_ref: "source platform/libretro/libretro.c:1279"
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- name: "bios_CD_J.bin"
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system: sega-megacd
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selection_slot: "mega-cd-bios"
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region: [japan]
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group: mega-cd-jp
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priority: 4
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size: 131072
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note: "JP Mega CD BIOS (generic name). Last in JP search order."
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source_ref: "source platform/libretro/libretro.c:1279"
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# -------------------------------------------------------
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# Sega 32X - HLE available, no frontend loads these
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# -------------------------------------------------------
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- name: "32X_G_BIOS.BIN"
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system: sega-32x
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required: false
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hle_fallback: true
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size: 256 # 0x100
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note: "32X 68K (Genesis-side) BIOS. HLE replacement generated when NULL."
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source_ref: "source pico/32x/memory.c:2208-2245"
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- name: "32X_M_BIOS.BIN"
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system: sega-32x
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required: false
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hle_fallback: true
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size: 2048 # 0x800
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note: "32X Master SH2 BIOS. HLE replacement generated when NULL."
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source_ref: "source pico/32x/memory.c:2251-2278"
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- name: "32X_S_BIOS.BIN"
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system: sega-32x
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required: false
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hle_fallback: true
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size: 1024 # 0x400
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note: "32X Slave SH2 BIOS. HLE replacement generated when NULL."
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source_ref: "source pico/32x/memory.c:2281-2299"
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platform_details:
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megacd:
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bios_size: 131072 # 128 KB
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hle_available: false
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region_specific: true
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extensions_tried: [".bin", ".zip"]
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source_ref: "pico/pico_int.h:559, platform/libretro/libretro.c:1317-1325"
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32x:
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m68k_bios_size: 256 # 0x100
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master_sh2_bios_size: 2048 # 0x800
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slave_sh2_bios_size: 1024 # 0x400
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hle_available: true
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source_ref: "pico/pico.h:54-55, pico/pico_int.h:679-693"
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sms:
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hle_available: true
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note: "No BIOS file loaded. VDP/RAM initialized to post-BIOS state."
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source_ref: "pico/sms.c:1080-1097"
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