ClownMDEmu
Summary
ClownMDEmu is a free emulator for the Sega Mega Drive, also known as the Sega Genesis. Its self-contained emulation core is implemented as a library, and the maker links to a browser version that can be tried online. There is also an official standalone frontend with debugging menus and an official libretro core for compatible hosts such as RetroArch and clownlibretro. The core can be built using CMake, but its repository notes that Git submodules must be initialized before compiling. The implementation targets C89 and uses integer-only logic, without dynamic memory or global state. Its state is held in a relocatable structure without pointers, supporting save states and the possibility of multiple emulator instances. Audio is output separately for FM and PSG at native sample rates, while video is provided one scanline at a time in indexed format. The maker says the emulator balances correctness with performance and may be more high-level than accuracy-focused alternatives. Some standard Mega Drive features remain unemulated, including listed 68k exception and VDP rendering areas. ClownMDEmu is free software under AGPLv3 or any later version.
Who it is for
ClownMDEmu suits Mega Drive or Genesis users who want a browser version, a standalone frontend, or a libretro core. Its library design and CMake build option may also suit developers integrating or building emulator software.
What is good
- Browser version can be tried online.
- Official standalone frontend includes debugging menus.
- Official libretro core supports compatible hosts.
- Core supports save states.
- Free software licensed under AGPLv3 or later.
What to know first
- Some standard Mega Drive features remain unemulated.
- Compilation requires Git submodules to be initialized.
- Maker describes it as potentially more high-level than accuracy-focused alternatives.
Verdict
ClownMDEmu offers browser, standalone, and libretro ways to use its Mega Drive emulation core. Readers should note the listed incomplete emulation areas and the build prerequisite for compiling it.
ClownMDEmu plans and pricing
All plansCompared on Sega genesis emulators
- Free plan
- Yesgithub.com
- Save states
- Yesgithub.com
Facts
- Purpose
- ClownMDEmu is an emulator for the Sega Mega Drive, also known as the Sega Genesis.github.com · 2 Oct 2026
- Core design
- The repository contains a self-contained emulation core designed for portability and implemented as a library.github.com · 2 Oct 2026
- Browser version
- The maker links to a web browser version that can be tried online.github.com · 2 Oct 2026
- Standalone frontend
- An official standalone frontend includes debugging menus and is written in C++20 using SDL3 and Dear ImGui.github.com · 2 Oct 2026
- Libretro integration
- An official frontend exposes ClownMDEmu as a libretro core for use with libretro implementations such as RetroArch and clownlibretro.github.com · 2 Oct 2026
- Build
- The core can be built using CMake, and its repository notes that Git submodules must be initialized before compiling.github.com · 2 Oct 2026
- Portability
- The core targets C89, integer-only logic, no dynamic memory, no global state, and code that avoids undefined or implementation-defined behavior.github.com · 2 Oct 2026
- Save-state design
- The core keeps state in a relocatable struct without pointers, which the maker says supports simple fast save states and the possibility of multiple emulator instances.github.com · 2 Oct 2026
- Audio and video output
- The core outputs FM and PSG audio separately at native sample rates and video one scanline at a time in indexed format.github.com · 2 Oct 2026
- Performance and accuracy
- The maker says the emulator balances correctness with performance and may be more high-level than accuracy-focused alternatives.github.com · 2 Oct 2026
- Incomplete emulation
- The maker notes that some standard Mega Drive features remain unemulated; the TODO lists incomplete 68k exceptions and unimplemented reset instruction and VDP rendering features.github.com · 2 Oct 2026
- License
- ClownMDEmu is free software licensed under the AGPLv3 or any later version.github.com · 2 Oct 2026
- Maintainer
- The GitHub maintainer profile describes Clownacy as a programming professional and Mega Drive hobbyist and lists England as the location.github.com · 2 Oct 2026
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Sources
- github.com/Clownacy/clownmdemu-core· checked 2 Oct 2026
- github.com/Clownacy/clownmdemu-frontend· checked 2 Oct 2026
- github.com/Clownacy/clownmdemu-core/blob/master/TO· checked 2 Oct 2026
- github.com/Clownacy· checked 2 Oct 2026