mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-04-13 12:22:33 -05:00
ebc8e4413f
freeintv_ts_overlay (same BIOS as FreeIntv), bnes (NES, no BIOS), clownmdemu (Mega Drive, open-source MCD boot ROM embedded), m2000 (Philips P2000T, all embedded), mesen (NES, FDS + StudyBox BIOS), race (NGP, HLE with disabled BIOS loader), vemulator (VMU, HLE only), gw (Game & Watch, Lua simulator), pd777 (Cassette Vision, no BIOS), play (PS2, full HLE, LoadBIOS commented out) 115 total profiles.
62 lines
2.4 KiB
YAML
62 lines
2.4 KiB
YAML
emulator: ClownMDEmu
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type: libretro
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source: "https://github.com/libretro/clownmdemu-libretro"
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cores:
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- clownmdemu
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systems:
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- sega-megadrive
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- sega-megacd
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notes: |
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ClownMDEmu is a Sega Mega Drive/Genesis and Mega CD emulator by Clownacy.
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Supports cartridge (bin/md/gen) and CD (cue/iso/chd) formats, plus a
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subsystem for cartridge+CD combo (Mega CD Mode 1).
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The core has NO external BIOS file requirements. firmware_count = 0 in the
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libretro .info file confirms this.
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Mega CD boot ROM: a custom open-source replacement boot ROM is compiled
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directly into the binary as a 16384-entry uint16 array
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(mega-cd-boot-rom.c included into bus-main-m68k.c:19-21). Source at
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https://github.com/Clownacy/clownmdemu-mcd-boot. No external CD BIOS
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files (bios_CD_E.bin, bios_CD_U.bin, bios_CD_J.bin) are needed or loaded.
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TMSS (Trademark Security System): not implemented at all. No TMSS ROM is
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loaded or checked. The core boots games directly without the "Produced by
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or under license from Sega" screen.
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The system directory (RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY) is only used
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as a fallback path for Backup RAM (BuRAM) save files, not for BIOS loading.
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CD add-on can be enabled for cartridge games via the "clownmdemu_cd_addon"
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core option to allow CD music features, but this uses the built-in boot
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ROM, not an external BIOS.
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The core implements its own Mega CD BIOS call handler (MegaCDBIOSCall in
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bus-sub-m68k.c) via HLE (high-level emulation) of Sub-CPU BIOS functions
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including CDBIOS, CDCTRN, FDRSET, FDRCHG, DRVINIT, CDCSTOP, CDCSTAT,
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CDCREAD, and others.
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files: []
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analysis:
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tmss:
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supported: false
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notes: |
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TMSS is not implemented. No ROM loaded, no "Produced by Sega" check.
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No references to TMSS exist anywhere in the codebase.
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megacd_bios:
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external_required: false
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builtin_boot_rom: true
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boot_rom_source: "https://github.com/Clownacy/clownmdemu-mcd-boot"
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boot_rom_location: "source/mega-cd-boot-rom.c (16384 uint16 entries = 32 KB)"
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bus_mapping: "0x400000-0x41FFFF (address & 0x20000 == 0)"
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source_ref: "bus-main-m68k.c:19-21, bus-main-m68k.c:484-494"
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bios_hle: true
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hle_source_ref: "bus-sub-m68k.c:64 (MegaCDBIOSCall)"
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notes: |
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The Mega CD boot ROM is an open-source replacement compiled into the
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binary. Sub-CPU BIOS calls are handled via HLE. No external Sega CD
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BIOS files (bios_CD_E/U/J.bin) are needed.
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