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Mega-Pi
What it is
Mega-Pi is a free bare-metal Sega Mega Drive/Genesis emulator built for Raspberry Pi 3 and 4. It runs without an operating system such as Linux, which the project says enables near-instant boot and very low input latency. The emulator uses the Picodrive core and Circle framework, assigning orchestration, video, audio and input work across four Raspberry Pi ARM cores. It scans Genesis and Mega Drive files in .bin, .md and .gen formats, plus Sega CD/Mega CD .cue and .chd files. Sega CD emulation covers the Sub-CPU, PCM audio, CD audio and rotation/scaling graphics hardware. Video uses 2× integer nearest-neighbor scaling to 640×480, with 44.1 kHz stereo through the Pi PWM sound engine. USB gamepads and keyboards are supported, and save states are stored on the SD card. Setup needs a FAT32 card, boot files, a kernel image, ROMs and USB input devices; Sega CD also needs regional BIOS files.
For and against
For
- Targets Raspberry Pi 3 and 4 hardware
- Supports Genesis, Mega Drive and Sega CD files
- Includes save states stored on the SD card
- Accepts USB gamepads and keyboards
- Provides 640×480 video and stereo audio
Against
- Requires a FAT32 SD card and setup files
- Sega CD play requires regional BIOS files
- Compilation requires the GNU Arm Embedded Toolchain
The verdict
Mega-Pi offers direct Raspberry Pi emulation with Genesis, Mega Drive and Sega CD support. Its bare-metal design and documented controls suit technical users willing to prepare the required hardware and files.
Who it suits
Mega-Pi suits Raspberry Pi owners who want a direct-boot emulator for Genesis, Mega Drive or Sega CD software. It is aimed at users comfortable preparing SD cards, ROM folders and, for Sega CD, BIOS files.
On the record
- 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.github.com · read 3 Oct 2026
- Boot and latency
- The project says bypassing an operating system such as Linux enables near-instant boot times and ultra-low input latency.github.com · read 2 Oct 2026
- Build requirement
- The project’s compile instructions require the GNU Arm Embedded Toolchain (`arm-none-eabi-gcc`).github.com · read 3 Oct 2026
- Controls
- The emulator supports USB gamepads and USB keyboards out of the box.github.com · read 3 Oct 2026
- Credits
- The project credits R. Stange for Circle and notaz and community contributors for Picodrive.github.com · read 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.github.com · read 3 Oct 2026
- Distribution
- The repository page lists a mega-pi-release-v1.1.zip file and documents packaging a release archive.github.com · read 2 Oct 2026
- Emulation core
- It uses the Picodrive emulation core and the Circle bare-metal C++ framework.github.com · read 3 Oct 2026
- Favorites
- Game favorites are stored persistently in `SD:/roms/favorites.txt`.github.com · read 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.github.com · read 3 Oct 2026
- Maker
- The GitHub profile identifies the repository owner as Alexsander Loula and lists Sao Paulo, Brazil.github.com · read 3 Oct 2026
- Multicore design
- The emulator distributes orchestration, video, audio, and input work across the Raspberry Pi’s four ARM cores.github.com · read 3 Oct 2026
- Purpose
- Mega-Pi is a bare-metal Sega Mega Drive/Genesis emulator designed to run on Raspberry Pi.github.com · read 3 Oct 2026
- ROM formats
- It scans Genesis/Mega Drive `.bin`, `.md`, and `.gen` files, as well as Sega CD `.cue` and `.chd` files.github.com · read 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.github.com · read 3 Oct 2026
- Sega CD support
- It supports Sega CD/Mega CD images in `.cue` with `.bin` tracks and compressed `.chd` formats.github.com · read 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.github.com · read 2 Oct 2026
- Supported hardware
- The build instructions describe Raspberry Pi 3 and Raspberry Pi 4 targets.github.com · read 3 Oct 2026
