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SPECIFICTION
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emmd

github.com

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Spec score 7.4 #19 of 29 in Sega Genesis Emulators

What it is

emmd is a free Sega Genesis (Mega Drive) emulator written in Go and targeting Model 1 hardware. Its desktop library can scan ROMs and organize games with artwork and metadata. It includes save-state management, rewind, fast-forward, shader effects, RetroAchievements integration and configurable settings. The emulator supports Motorola 68000 and Zilog Z80 CPUs, VDP rendering, YM2612 FM synthesis and SN76489 PSG audio. It handles two-player three-button and six-button controllers, battery-backed SRAM, and save states checked with CRC32 checksums and ROM CRC matching. NTSC and PAL can be detected from a ROM header or selected manually. A LibRetro core is available for compatible frontends, and a documented macOS build creates an application bundle with an icon and code signing. The stated scope is officially licensed, released Genesis games; unlicensed or homebrew games, prototypes, beta ROMs and non-controller peripherals are unsupported. Platforms listed are Windows, macOS, Linux and iOS. Building requires Go 1.25 or later, and the repository identifies the license as GPL-3.0.

Spec sheet

Purpose
emmd is a Sega Genesis (Mega Drive) emulator written in Go and targeting Model 1 hardware.Read 3 Oct 2026 · github.com
Product
emmd is a Sega Genesis (Mega Drive) emulator written in Go and targeting Model 1 hardware.Read 2 Oct 2026 · github.com
License
The repository lists a GPL-3.0 license.Read 3 Oct 2026 · github.com
Maker
The GitHub account for the repository is named John Schember and lists Florida, USA.Read 2 Oct 2026 · github.com
Build requirement
Building the project requires Go 1.25 or later.Read 3 Oct 2026 · github.com
Compatibility limit
The emulator targets officially licensed, released Genesis games and lists unlicensed or homebrew games, prototypes, beta ROMs, and non-controller peripherals as unsupported.Read 2 Oct 2026 · github.com
Compatibility limits
The emulator targets officially licensed and released Genesis games and says it does not support unlicensed or homebrew games, prototype or beta ROMs, or non-controller peripherals.Read 3 Oct 2026 · github.com
Controllers
It supports two players using 3-button or 6-button controllers.Read 3 Oct 2026 · github.com
Desktop features
The desktop UI includes a game library with ROM scanning, artwork, metadata, save state management, rewind, fast-forward, shader effects, RetroAchievements integration, and configurable settings.Read 3 Oct 2026 · github.com
Desktop library
Its desktop UI provides a game library with ROM scanning, artwork, metadata, save-state management, rewind, fast-forward, shader effects, RetroAchievements integration, and configurable settings.Read 2 Oct 2026 · github.com
Development requirement
Building the project requires Go 1.25 or later.Read 2 Oct 2026 · github.com
Emulated hardware
The emulator supports Motorola 68000 and Zilog Z80 CPUs, VDP rendering, YM2612 FM synthesis, and SN76489 PSG audio.Read 3 Oct 2026 · github.com
Emulation
The emulator supports Motorola 68000 and Zilog Z80 CPUs, VDP rendering, YM2612 FM synthesis, and SN76489 PSG audio.Read 2 Oct 2026 · github.com
Frontend integration
The project provides a LibRetro core for use with LibRetro-compatible frontends.Read 3 Oct 2026 · github.com
Integration
A LibRetro core is provided for use with LibRetro-compatible frontends.Read 2 Oct 2026 · github.com
macOS
The project documents a build target that creates a macOS application bundle with an icon and code signing.Read 2 Oct 2026 · github.com
Regions
It supports NTSC and PAL and can detect the region from a ROM header.Read 3 Oct 2026 · github.com
Save data
It supports battery-backed SRAM and save states, which are checked with CRC32 checksums and ROM CRC matching.Read 3 Oct 2026 · github.com

Strong points and limits

Strong points

  • Supports Windows, macOS, Linux and iOS.
  • Includes rewind, fast-forward and shader effects.
  • Supports two-player three-button and six-button controllers.
  • A LibRetro core is provided.
  • Free to use.

Limits

  • Unlicensed and homebrew games are unsupported.
  • Prototypes and beta ROMs are unsupported.
  • Non-controller peripherals are unsupported.
  • Building requires Go 1.25 or later.

Who it suits

It suits Genesis owners looking for an emulator with game-library tools, save states and shader effects. It is intended for officially licensed, released games and users able to build with Go 1.25 or later.

Verdict

emmd offers game-library features alongside Genesis hardware emulation and multiple region options. Check its compatibility limits before choosing it, especially if you use homebrew, prototype ROMs or non-controller peripherals.

Where Specifiction places it

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