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# ClownMDEmu - RetroBIOS

Type | standalone + libretro
Classification | official_port
Source | https://github.com/Clownacy/clownmdemu-libretro
Upstream | https://github.com/Clownacy/clownmdemu
Version | Git
Profiled | 2026-03-23
Cores | clownmdemu
Systems | sega-megadrive, sega-megacd

Source analysis

tmss:

    - **supported:** False

megacd_bios:

    - **external_required:** False
    - **builtin_boot_rom:** True
    - **boot_rom_source:** https://github.com/Clownacy/clownmdemu-mcd-boot
    - **boot_rom_location:** source/mega-cd-boot-rom.c (16384 uint16 entries = 32 KB)
    - **bus_mapping:** 0x400000-0x41FFFF (address & 0x20000 == 0)
    - **source_ref:** bus-main-m68k.c:19-21, bus-main-m68k.c:501-513
    - **bios_hle:** True
    - **hle_source_ref:** bus-sub-m68k.c:64 (MegaCDBIOSCall)

Technical notes

Mega Drive/Genesis and Mega CD emulator by Clownacy. Supports cartridge (bin/md/gen) and CD (cue/iso/chd) formats, plus a subsystem for cartridge+CD combo (Mega CD Mode 1). Mega CD boot ROM is an open-source replacement compiled into the binary (mega-cd-boot-rom.c, 32 KB). Sub-CPU BIOS calls handled via HLE. TMSS not implemented. No external files needed.

No BIOS or firmware files required. Generated on 2026-03-25T14:56:43Z