ClownMDEmu

ClownMDEmu emulates Sega Mega Drive and Sega Mega CD.

About this profile

Detail	Value
Type	standalone + libretro
Classification	Official port
Source	https://github.com/Clownacy/clownmdemu-libretro
Upstream	https://github.com/Clownacy/clownmdemu-core
Version	v1.6.12, stated in source/libretro-interface.c
Revision	Clownacy/clownmdemu-libretro@d43c2708b0a3, Clownacy/clownmdemu-core@88ef45a65855
Profiled	2026-03-23
Profile	YAML, JSON
Cores	clownmdemu
Systems	Sega Mega Drive, Sega Mega CD

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.

Profile data

Source analysis

• tmss:

  • supported: no

• megacd bios:

  • external required: no
  • builtin boot rom: yes
  • 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: source/bus-main-m68k.c:19-21, source/bus-main-m68k.c:508-521
  • bios hle: yes
  • hle source ref: source/bus-sub-m68k.c:66 (MegaCDBIOSCall)

Next steps

• Get your files, for the setup you play on
• Every system, and the files each one needs
• When a game does not start

Data as of 4 November 2026.