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SPECIFICTION
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Mega-Pi

github.com

Linux
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Spec score 6.8 #17 of 19 in Sega CD Emulators

What it is

Mega-Pi is a free, bare-metal Sega Mega Drive/Genesis emulator for Raspberry Pi hardware. It targets Raspberry Pi 3 and 4 and runs without an operating system such as Linux, which the project associates with near-instant boot and very low input latency. The emulator uses the Picodrive core and Circle bare-metal C++ framework, assigning orchestration, video, audio, and input work across four ARM cores. It scans .bin, .md, and .gen Genesis or Mega Drive files, plus Sega CD/Mega CD .cue files with .bin tracks and compressed .chd files. Sega CD emulation includes 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 reside on the SD card. Running it requires a FAT32 card, boot files, a kernel image, game files, and USB input devices; Sega CD also needs regional BIOS files.

Spec sheet

Purpose
Mega-Pi is a bare-metal Sega Mega Drive/Genesis emulator designed to run on Raspberry Pi.Read 3 Oct 2026 · github.com
Maker
The GitHub profile identifies the repository owner as Alexsander Loula and lists Sao Paulo, Brazil.Read 3 Oct 2026 · github.com
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.Read 3 Oct 2026 · github.com
Boot and latency
The project says bypassing an operating system such as Linux enables near-instant boot times and ultra-low input latency.Read 2 Oct 2026 · github.com
Build requirement
The project’s compile instructions require the GNU Arm Embedded Toolchain (`arm-none-eabi-gcc`).Read 3 Oct 2026 · github.com
Controls
The emulator supports USB gamepads and USB keyboards out of the box.Read 3 Oct 2026 · github.com
Credits
The project credits R. Stange for Circle and notaz and community contributors for Picodrive.Read 2 Oct 2026 · github.com
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.Read 3 Oct 2026 · github.com
Distribution
The repository page lists a mega-pi-release-v1.1.zip file and documents packaging a release archive.Read 2 Oct 2026 · github.com
Emulation core
It uses the Picodrive emulation core and the Circle bare-metal C++ framework.Read 3 Oct 2026 · github.com
Favorites
Game favorites are stored persistently in `SD:/roms/favorites.txt`.Read 3 Oct 2026 · github.com
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.Read 3 Oct 2026 · github.com
Multicore design
The emulator distributes orchestration, video, audio, and input work across the Raspberry Pi’s four ARM cores.Read 3 Oct 2026 · github.com
ROM formats
It scans Genesis/Mega Drive `.bin`, `.md`, and `.gen` files, as well as Sega CD `.cue` and `.chd` files.Read 3 Oct 2026 · github.com
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.Read 3 Oct 2026 · github.com
Sega CD support
It supports Sega CD/Mega CD images in `.cue` with `.bin` tracks and compressed `.chd` formats.Read 3 Oct 2026 · github.com
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.Read 2 Oct 2026 · github.com
Supported hardware
The build instructions describe Raspberry Pi 3 and Raspberry Pi 4 targets.Read 3 Oct 2026 · github.com
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.Read 2 Oct 2026 · github.com

Strong points and limits

Strong points

  • Free plan
  • Targets Raspberry Pi 3 and 4
  • Supports Genesis and Sega CD formats
  • USB gamepad and keyboard support
  • SD-card save states

Limits

  • Requires FAT32 SD-card setup
  • Sega CD games require regional BIOS files
  • Compilation requires GNU Arm Embedded Toolchain

Who it suits

It suits Raspberry Pi owners building a dedicated Mega Drive, Genesis, or Sega CD setup. Users should be comfortable preparing SD-card files and, for compilation, the GNU Arm Embedded Toolchain and Circle framework.

Verdict

Mega-Pi focuses on direct Raspberry Pi operation, broad Sega file support, and low-latency startup. Its hardware-specific installation and BIOS requirements make it a project for users prepared to manage the underlying files and build tools.

Where Specifiction places it

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