mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-10-21 11:19:11 -05:00
Abdessamad Derraz
4f5349c8fd
The Sega CD region code U is the Americas, as for the other profiles' US Mega CD BIOS.
217 lines
10 KiB
YAML
217 lines
10 KiB
YAML
emulator: BlastEm
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type: standalone + libretro
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core_classification: official_port
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source: "https://github.com/libretro/blastem"
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upstream: "https://www.retrodev.com/blastem/"
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profiled_date: "2026-10-20"
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source_commit: "1e0de94dc7e669c0925a22c0fccf6cdc837af0a0"
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core_version: "1.0.1-pre"
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display_name: "Sega - Mega Drive - Genesis (BlastEm)"
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cores:
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- blastem
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systems:
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- sega-megadrive
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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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- colecovision
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- pioneer-laseractive
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notes: |
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BlastEm emulates the Mega Drive/Genesis, Sega CD, 32X, Master System, Game
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Gear, SG-1000, SC-3000, Pico, Copera, ColecoVision and the Pioneer LaserActive
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player. The libretro port lives in libblastem.c and offers every machine the
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standalone can force except the Jaguar (libblastem.c:20-44).
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Each firmware path is a config key. The libretro core writes
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<system_dir>/<name> into those keys before any machine is built
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(libblastem.c:497-530). The names are opened exactly as written, with no
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hash or size check.
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The standalone build leaves the keys unset by default (default.cfg), so
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each loader falls back to its own default name. The Sega CD BIOS, the
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ColecoVision BIOS, the LaserActive firmware and the TMSS ROM are then read
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beside the executable through read_bundled_file() (paths.c:596-631). The 32X
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BIOS ROMs are opened by bare name, relative to the working directory
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(32x.c:1072, 1417, 1449).
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A fatal error while a game loads unwinds to retro_load_game(), which reports
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the failure to the frontend (libblastem.c:975-989, 1053-1058). Missing Sega
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CD BIOS and missing TMSS ROM end there.
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The default Mega Drive model is md1va3, which has no TMSS
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(libblastem.c:355-359, systems.cfg:12-20). md1va6, md2va1, md2va2, md3va1
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and md3va2 enable it (systems.cfg:23-75) and can be picked with the
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blastem_model option (libblastem.c:185-187).
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files:
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# rom.db is embedded in the libretro binary (libblastem.c:1436-1455,
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# extern const char rom_db_data[]) and no external copy is read there.
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# The standalone build reads it beside the executable. The .info lists it
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# as firmware0_opt=true.
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# .info sha1 E5414FB1C4CC7D7F5101C07E4547316779BA3D97 does not match
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# the version in our repo (sha1 02c287d1...): rom.db changes between
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# BlastEm releases.
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- name: rom.db
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system: sega-megadrive
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required: false
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mode: standalone
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bundled: true
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sha1: "9109da664801e8ba02e790c085cbdca58068e50a"
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md5: "48b457c7e2df6ec7c16ae34d8f24c4b6"
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hle_fallback: true
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note: "ROM feature database (game-specific mapper/save config). Shipped beside the executable in the 1.0.0 Windows and Linux archives, whose copy the hashes describe. The libretro core compiles it in and reads no external copy."
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source_ref: "source romdb.c:44-53, source libblastem.c:1436-1455"
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# -------------------------------------------------------
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# Sega CD / Mega CD BIOS
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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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mode: libretro
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note: "Sega CD BIOS for discs whose header allows the default region U, or that carry neither E nor J (segacd.c:1573-1593). An empty file counts as missing (segacd.c:1599-1602). Without it a CD image fails to load (segacd.c:1644-1647). A Mode 1 cartridge runs without it as a plain cartridge (genesis.c:3156-3162)."
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source_ref: "source libblastem.c:501, source segacd.c:1573-1615"
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- name: bios_CD_E.bin
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system: sega-megacd
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region: [europe]
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required: true
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mode: libretro
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note: "Mega CD BIOS for discs whose region resolves to E (segacd.c:1587-1588). Same load rules as bios_CD_U.bin."
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source_ref: "source libblastem.c:502, source segacd.c:1573-1615"
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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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mode: libretro
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note: "Mega CD BIOS for discs whose region resolves to J (segacd.c:1589-1590). Same load rules as bios_CD_U.bin."
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source_ref: "source libblastem.c:503, source segacd.c:1573-1615"
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- name: cdbios.bin
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system: sega-megacd
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required: true
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mode: standalone
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unread_on: [retrobat]
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note: "Default name of all three regional Sega CD BIOS keys when the config sets none. Read beside the executable, whatever the disc region. Without it a CD image stops with a fatal error (segacd.c:1644-1647). RetroBat writes absolute paths to bios_CD_U/E/J.bin into the config (emulatorlauncher Blastem.Generator.cs:256-269), so this name is never opened there."
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source_ref: "source segacd.c:1594, source segacd.c:1607-1609"
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# -------------------------------------------------------
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# 32X BIOS
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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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note: "68K side BIOS. Only the first 0x100 bytes are read. Without it the core writes its own vector table and warns that some games need the real one (32x.c:1072-1086)."
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source_ref: "source libblastem.c:508, source 32x.c:1072-1086"
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- name: 32X_M_BIOS.bin
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system: sega-32x
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required: true
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note: "Master SH2 BIOS, read into the 16 KiB boot ROM area (32x.c:1399-1400, 1417-1425). The libretro core refuses a 32X load when the file is missing or its reset vector is zero (libblastem.c:998-1017, 1098-1104). The standalone runs the SH2 on zeroed ROM and stops at an unimplemented instruction."
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source_ref: "source libblastem.c:509, source libblastem.c:1098-1104, source 32x.c:1417-1425"
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- name: 32X_S_BIOS.bin
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system: sega-32x
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required: true
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note: "Slave SH2 BIOS, read into the 16 KiB boot ROM area (32x.c:1449-1457). Same refusal rule as 32X_M_BIOS.bin in the libretro core (libblastem.c:1098-1104)."
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source_ref: "source libblastem.c:510, source libblastem.c:1098-1104, source 32x.c:1449-1457"
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# -------------------------------------------------------
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# ColecoVision BIOS
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# -------------------------------------------------------
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- name: colecovision.rom
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system: colecovision
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required: true
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mode: libretro
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size: 8192
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note: "Read into the 8 KiB BIOS area mapped at 0x0000 (coleco.h:13, coleco.c:513). Without it the core only warns and runs a zeroed BIOS, so no game starts (coleco.c:485-492)."
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source_ref: "source libblastem.c:504, source coleco.c:485-492"
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- name: colecovision_bios.col
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system: colecovision
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required: true
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mode: standalone
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unread_on: [retrobat]
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size: 8192
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note: "Default name of the ColecoVision BIOS key when the config sets none. Read beside the executable, truncated to 8 KiB (coleco.c:496-505). RetroBat points the key at colecovision.rom (emulatorlauncher Blastem.Generator.cs:256-269)."
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source_ref: "source coleco.c:485, source coleco.c:496-505"
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# -------------------------------------------------------
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# Pioneer LaserActive player firmware
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# -------------------------------------------------------
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- name: laseractive_dyw_1322a.bin
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system: pioneer-laseractive
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required: true
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size: 65536
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crc32: "3d6f6ed3"
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md5: "d6ccd1da5c4a1b22c64e6eec899e0daf"
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sha1: "b1e48d1f5e494a6cbece61cfca4469dea33fba4b"
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sha256: "02a4a82c4f5abfe2c7e15d3682be9590be96607cb9213ce88e335f34db95d76f"
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note: "uPD78237 mode controller ROM of the CLD-A100 player. Only the first 0xE000 bytes are mapped (laseractive.h:16, laseractive.c:533-534). Without it the core warns and the controller runs a zeroed ROM. The hashes describe the 64 KiB dump the BlastEm author published, whose last 8 KiB are 0xFF."
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source_ref: "source libblastem.c:513, source laseractive.c:504-531"
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# -------------------------------------------------------
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# TMSS ROM
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# -------------------------------------------------------
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- name: tmss.md
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system: sega-megadrive
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required: false
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mode: libretro
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aliases: [bios_MD.bin]
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note: "Read only for a model with TMSS. tmss.md is tried first, then bios_MD.bin (libblastem.c:514-529). With a TMSS model selected and neither file present, the load fails (genesis.c:3036-3051). Any size is accepted and mirrored to fill the TMSS space (genesis.c:3054-3065)."
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source_ref: "source libblastem.c:514-529, source genesis.c:3036-3065"
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- name: tmss.md
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system: sega-megadrive
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required: false
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mode: standalone
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bundled: true
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size: 4014
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sha1: "d0fd0c163b693d819fc907538fbdec76d7ec669d"
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md5: "1929426a8888785411d30f24bd0f8139"
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note: "TMSS startup ROM for models md1va6, md2va1 and later. The 1.0.0 Windows and Linux archives ship BlastEm's own replacement, built from tmss.s68, under this name. Any size is accepted: the image is padded and mirrored to fill the TMSS space."
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source_ref: "source genesis.c:3036-3065"
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analysis:
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tmss:
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default_model: md1va3
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tmss_models: [md1va6, md2va1, md2va2, md3va1, md3va2]
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rom_filename: tmss.md
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libretro_fallback_name: bios_MD.bin
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config_path: "system\0tmss_path\0"
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source_ref: "source libblastem.c:355-359, source libblastem.c:514-529, source genesis.c:3036-3051"
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note: |
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The libretro core exposes the model as blastem_model and points
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system/tmss_path at the system directory. The standalone falls back to
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tmss.md beside the executable.
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sega_cd:
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region_keys: [scd_bios_us, scd_bios_eu, scd_bios_jp]
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standalone_default: cdbios.bin
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source_ref: "source segacd.c:1573-1615, source segacd.c:1644-1647"
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note: |
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The region comes from the disc header, or from the default region when
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the header allows it. A Mode 1 cartridge that finds no BIOS runs without
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the Sega CD (genesis.c:3156-3162).
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s32x:
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source_ref: "source libblastem.c:998-1017, source libblastem.c:1098-1104"
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note: |
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The libretro core checks that both SH2 BIOS files exist and carry a
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non-zero reset vector before it builds a 32X machine.
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jaguar_bios:
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libretro_relevant: false
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source_ref: "source jaguar.c:571-575"
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note: |
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blastjag is a separate standalone binary, not compiled into the
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libretro core. It reads the BIOS from its first command line argument.
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