Mega-Pi
Mega-Pi is a bare-metal Sega Mega Drive/Genesis emulator designed for Raspberry Pi 3 and 4.
What Mega-Pi is
Mega-Pi is a bare-metal Sega Mega Drive/Genesis emulator designed for Raspberry Pi 3 and 4. By running without an operating system such as Linux, the project aims for near-instant boot and very low input latency. It uses the Picodrive emulation core and Circle bare-metal C++ framework, distributing orchestration, video, audio, and input work across four Raspberry Pi ARM cores. It scans Genesis and Mega Drive .bin, .md, and .gen files, as well as Sega CD/Mega CD .cue and .chd files. Sega CD emulation covers the Sub-CPU, PCM and CD audio, and rotation/scaling graphics hardware. Video is upscaled to 640×480, with 44.1 kHz stereo audio through the Pi PWM sound engine. USB gamepads and keyboards are supported, and save states are stored on the SD card. Running it requires a FAT32 SD card with boot files and a kernel image, ROMs, and USB input devices; Sega CD play also requires a regional BIOS file in a BIOS folder. The repository provides a release archive.
Good
- Runs on Raspberry Pi 3 and 4.
- Supports Genesis and Mega Drive ROM formats.
- Sega CD support includes CD audio.
- Accepts USB gamepads and keyboards.
- Save states are stored on the SD card.
Watch out
- Requires a FAT32 SD card and kernel image.
- Sega CD games require regional BIOS files.
- Building requires the GNU Arm Embedded Toolchain and Circle framework.
Who it suits
It suits Raspberry Pi 3 or 4 users who want a dedicated Genesis/Mega Drive emulator, including Sega CD support, and can prepare an SD card and required files.
Verdict
Mega-Pi targets Raspberry Pi users seeking bare-metal Genesis/Mega Drive emulation, with Sega CD support and USB controls. Setup depends on the required SD-card files, and Sega CD use additionally needs a correctly named BIOS.
The facts
Each one read from Mega-Pi's own pages, with the date it was checked.
Where it runs
- BIOS setup
- Sega CD support requires regional BIOS files named `bios_CD_U.bin`, `bios_CD_E.bin`, or `bios_CD_J.bin` in a `bios` folder on the SD card.checked 3 Oct 2026
What it does
- Boot and latency
- The project says bypassing an operating system such as Linux enables near-instant boot times and ultra-low input latency.checked 2 Oct 2026
- Build requirement
- The project’s compile instructions require the GNU Arm Embedded Toolchain (`arm-none-eabi-gcc`).checked 3 Oct 2026
- Controls
- The emulator supports USB gamepads and USB keyboards out of the box.checked 3 Oct 2026
- Credits
- The project credits R. Stange for Circle and notaz and community contributors for Picodrive.checked 2 Oct 2026
- Display and audio
- The video core performs 2× integer nearest-neighbor upscaling to 640×480, and audio is output as 44.1 kHz stereo through the Pi PWM sound engine.checked 3 Oct 2026
- Distribution
- The repository page lists a mega-pi-release-v1.1.zip file and documents packaging a release archive.checked 2 Oct 2026
- Emulation core
- It uses the Picodrive emulation core and the Circle bare-metal C++ framework.checked 3 Oct 2026
- Favorites
- Game favorites are stored persistently in `SD:/roms/favorites.txt`.checked 3 Oct 2026
- Installation
- Running it requires a FAT32 SD card containing the boot files, the compiled kernel image, a `roms` folder, and—when using Sega CD games—a `bios` folder.checked 3 Oct 2026
- Multicore design
- The emulator distributes orchestration, video, audio, and input work across the Raspberry Pi’s four ARM cores.checked 3 Oct 2026
- Purpose
- Mega-Pi is a bare-metal Sega Mega Drive/Genesis emulator designed to run on Raspberry Pi.checked 3 Oct 2026
- ROM formats
- It scans Genesis/Mega Drive `.bin`, `.md`, and `.gen` files, as well as Sega CD `.cue` and `.chd` files.checked 3 Oct 2026
- Save states
- Save states are stored on the SD card, and the README says save operations check SD-card status and confirm sector programming before returning.checked 3 Oct 2026
- Sega CD support
- It supports Sega CD/Mega CD images in `.cue` with `.bin` tracks and compressed `.chd` formats.checked 3 Oct 2026
- Setup requirements
- Running it requires a FAT32 SD card, a Raspberry Pi 3 or 4 kernel image, game files, and USB input devices; Sega CD games also require appropriately named BIOS files.checked 2 Oct 2026
- Supported hardware
- The build instructions describe Raspberry Pi 3 and Raspberry Pi 4 targets.checked 3 Oct 2026
- Video and sound
- The README describes 2× integer nearest-neighbor upscaling to 640×480 and 44.1 kHz stereo audio through the Pi PWM sound engine.checked 2 Oct 2026
The company
- Maker
- The GitHub profile identifies the repository owner as Alexsander Loula and lists Sao Paulo, Brazil.checked 3 Oct 2026
Alternatives to Mega-Pi
- 1
Manic EMU
Free planOpen sourceiOSmacOSSelf-hosted8.2Free plan - 2
Provenance
Free planOpen sourceiOSmacOS8.2From $39.99 a year - 3
webЯcade
Free planOpen sourceAndroidiOSWebLinux7.9Free plan - 4
RetroArch
Free planAndroidiOSWebLinux7.7Free plan - 5
BlastEm
Free planOpen sourceWebLinuxmacOSSelf-hosted7.6Free plan - 6
ares
Free planOpen sourceLinuxmacOSSelf-hostedWindows7.5Free plan