mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-10-21 11:19:11 -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.
237 lines
8.2 KiB
YAML
237 lines
8.2 KiB
YAML
emulator: PicoDrive
|
|
type: libretro
|
|
core_classification: official_port
|
|
source: "https://github.com/libretro/picodrive"
|
|
upstream: "https://github.com/irixxxx/picodrive"
|
|
profiled_date: "2026-03-24"
|
|
source_commit: "1890c2932234c9d30f4cd3851d02228baae8f09e"
|
|
core_version: "1.99"
|
|
display_name: "Sega - MS/GG/MD/CD/32X (PicoDrive)"
|
|
cores: [picodrive]
|
|
systems:
|
|
- sega-megadrive
|
|
- sega-genesis
|
|
- sega-megacd
|
|
- sega-megacd
|
|
- sega-32x
|
|
- sega-mastersystem
|
|
- sega-gamegear
|
|
- sega-sg1000
|
|
- sega-sc3000
|
|
- sega-pico
|
|
|
|
notes: |
|
|
PicoDrive is a fast Mega Drive / Genesis emulator with Mega CD, 32X, Master
|
|
System, Game Gear, SG-1000, SC-3000 and Sega Pico support. The libretro port
|
|
is part of the PicoDrive source tree (platform/libretro/).
|
|
|
|
Mega CD / Sega CD games require a region-matching BIOS file. The core searches
|
|
the system directory for each name in order, trying .bin then .zip extension,
|
|
and uses the first file found. If no BIOS is found, CD games fail to load with
|
|
PM_BAD_CD_NO_BIOS. MSU-MD games can run without BIOS.
|
|
|
|
BIOS filename search order (platform/libretro/libretro.c:1272-1336):
|
|
US: us_scd2_9306, SegaCDBIOS9303, us_scd1_9210, bios_CD_U
|
|
EU: eu_mcd2_9306, eu_mcd2_9303, eu_mcd1_9210, bios_CD_E
|
|
JP: jp_mcd2_921222, jp_mcd1_9112, jp_mcd1_9111, bios_CD_J
|
|
|
|
32X BIOS files (m68k, master SH2, slave SH2) are fully optional. The engine
|
|
has built-in HLE that generates replacement code at startup when the BIOS
|
|
pointers are NULL (pico/32x/memory.c:2202 get_bios(), pico/32x/32x.c:172).
|
|
No current frontend (libretro or standalone) loads these files, and the standalone
|
|
loading code is disabled (#if 0 in platform/common/emu.c:1530).
|
|
|
|
carthw.cfg is a cartridge hardware database loaded from the system directory.
|
|
A built-in version is compiled into the core (pico/carthw_cfg.c). The external
|
|
file supplements or overrides game-specific hardware detection (SVP, EEPROM
|
|
types, special mappers, copy protection).
|
|
|
|
Master System, Game Gear, SG-1000, SC-3000: no BIOS file loaded. The core
|
|
initializes VDP registers and RAM to simulate post-BIOS state
|
|
(pico/sms.c:1080-1097).
|
|
|
|
files:
|
|
# -------------------------------------------------------
|
|
# Cartridge hardware database
|
|
# -------------------------------------------------------
|
|
- name: "carthw.cfg"
|
|
required: false
|
|
note: "Cartridge hardware database for special mapper and EEPROM detection. Built-in fallback compiled into the core."
|
|
source_ref: "source platform/libretro/libretro.c:1627, source pico/cart.c:1020-1022"
|
|
|
|
# -------------------------------------------------------
|
|
# Mega CD / Sega CD - US region
|
|
# -------------------------------------------------------
|
|
- name: "us_scd2_9306.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [north-america, latin-america]
|
|
priority: 1
|
|
required: true
|
|
size: 131072 # 128 KB (0x20000)
|
|
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)."
|
|
source_ref: "source platform/libretro/libretro.c:1273"
|
|
|
|
- name: "SegaCDBIOS9303.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [north-america, latin-america]
|
|
priority: 2
|
|
required: false
|
|
size: 131072
|
|
note: "US Sega CD BIOS (March 1993). Second in US search order."
|
|
source_ref: "source platform/libretro/libretro.c:1273"
|
|
|
|
- name: "us_scd1_9210.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [north-america, latin-america]
|
|
priority: 3
|
|
required: false
|
|
size: 131072
|
|
note: "US Sega CD Model 1 BIOS (October 1992). Third in US search order."
|
|
source_ref: "source platform/libretro/libretro.c:1273"
|
|
|
|
- name: "bios_CD_U.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [north-america, latin-america]
|
|
priority: 4
|
|
required: false
|
|
size: 131072
|
|
note: "US Sega CD BIOS (generic name). Last in US search order."
|
|
source_ref: "source platform/libretro/libretro.c:1273"
|
|
|
|
# -------------------------------------------------------
|
|
# Mega CD / Sega CD - EU region
|
|
# -------------------------------------------------------
|
|
- name: "eu_mcd2_9306.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [europe, oceania]
|
|
priority: 1
|
|
required: true
|
|
size: 131072
|
|
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)."
|
|
source_ref: "source platform/libretro/libretro.c:1276"
|
|
|
|
- name: "eu_mcd2_9303.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [europe, oceania]
|
|
priority: 2
|
|
required: false
|
|
size: 131072
|
|
note: "EU Mega CD Model 2 BIOS (March 1993). Second in EU search order."
|
|
source_ref: "source platform/libretro/libretro.c:1276"
|
|
|
|
- name: "eu_mcd1_9210.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [europe, oceania]
|
|
priority: 3
|
|
required: false
|
|
size: 131072
|
|
note: "EU Mega CD Model 1 BIOS (October 1992). Third in EU search order."
|
|
source_ref: "source platform/libretro/libretro.c:1276"
|
|
|
|
- name: "bios_CD_E.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [europe, oceania]
|
|
priority: 4
|
|
required: false
|
|
size: 131072
|
|
note: "EU Mega CD BIOS (generic name). Last in EU search order."
|
|
source_ref: "source platform/libretro/libretro.c:1276"
|
|
|
|
# -------------------------------------------------------
|
|
# Mega CD / Sega CD - JP region
|
|
# -------------------------------------------------------
|
|
- name: "jp_mcd2_921222.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [japan]
|
|
priority: 1
|
|
required: true
|
|
size: 131072
|
|
note: "JP Mega CD Model 2 BIOS (December 1992). First in JP search order."
|
|
source_ref: "source platform/libretro/libretro.c:1279"
|
|
|
|
- name: "jp_mcd1_9112.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [japan]
|
|
priority: 2
|
|
required: false
|
|
size: 131072
|
|
note: "JP Mega CD Model 1 BIOS (December 1991). Second in JP search order."
|
|
source_ref: "source platform/libretro/libretro.c:1279"
|
|
|
|
- name: "jp_mcd1_9111.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [japan]
|
|
priority: 3
|
|
required: false
|
|
size: 131072
|
|
note: "JP Mega CD Model 1 BIOS (November 1991). Third in JP search order."
|
|
source_ref: "source platform/libretro/libretro.c:1279"
|
|
|
|
- name: "bios_CD_J.bin"
|
|
system: sega-megacd
|
|
variant_group: "mega-cd-bios"
|
|
region: [japan]
|
|
priority: 4
|
|
required: false
|
|
size: 131072
|
|
note: "JP Mega CD BIOS (generic name). Last in JP search order."
|
|
source_ref: "source platform/libretro/libretro.c:1279"
|
|
|
|
# -------------------------------------------------------
|
|
# Sega 32X - HLE available, no frontend loads these
|
|
# -------------------------------------------------------
|
|
- name: "32X_G_BIOS.BIN"
|
|
system: sega-32x
|
|
required: false
|
|
hle_fallback: true
|
|
size: 256 # 0x100
|
|
note: "32X 68K (Genesis-side) BIOS. HLE replacement generated when NULL."
|
|
source_ref: "source pico/32x/memory.c:2208-2245"
|
|
|
|
- name: "32X_M_BIOS.BIN"
|
|
system: sega-32x
|
|
required: false
|
|
hle_fallback: true
|
|
size: 2048 # 0x800
|
|
note: "32X Master SH2 BIOS. HLE replacement generated when NULL."
|
|
source_ref: "source pico/32x/memory.c:2251-2278"
|
|
|
|
- name: "32X_S_BIOS.BIN"
|
|
system: sega-32x
|
|
required: false
|
|
hle_fallback: true
|
|
size: 1024 # 0x400
|
|
note: "32X Slave SH2 BIOS. HLE replacement generated when NULL."
|
|
source_ref: "source pico/32x/memory.c:2281-2299"
|
|
|
|
platform_details:
|
|
megacd:
|
|
bios_size: 131072 # 128 KB
|
|
hle_available: false
|
|
region_specific: true
|
|
extensions_tried: [".bin", ".zip"]
|
|
source_ref: "pico/pico_int.h:559, platform/libretro/libretro.c:1317-1325"
|
|
|
|
32x:
|
|
m68k_bios_size: 256 # 0x100
|
|
master_sh2_bios_size: 2048 # 0x800
|
|
slave_sh2_bios_size: 1024 # 0x400
|
|
hle_available: true
|
|
source_ref: "pico/pico.h:54-55, pico/pico_int.h:679-693"
|
|
|
|
sms:
|
|
hle_available: true
|
|
note: "No BIOS file loaded. VDP/RAM initialized to post-BIOS state."
|
|
source_ref: "pico/sms.c:1080-1097"
|