Geolith

6.4easy start · #9 of 26
in NES Emulators

Free to practise onnot on record
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on Linux, Mac, Windows.

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Geolith is ranked #9 of 26 in NES emulators on The Geeks Club. It runs on Linux, macOS, Windows.

Compared on NES emulators

AES emulation: Yes
MVS emulation: Yes
Neo Geo CD support: Yes
Supported platforms: Linux, macOS, BSD, Windows

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The record

What it does: Geolith is a highly accurate emulator for the Neo Geo AES, MVS, CD, and CDZ.
Game formats: Cartridge systems support TerraOnion .NEO files, while CD systems support .bin/.cue and optionally .chd disc images.
BIOS requirement: BIOS files from a recent MAME set are required, with the required archives varying by system.
Compatibility: The README states Geolith is compatible with all commercially released Neo Geo AES, MVS, and CD games.
Input devices: Supported inputs include Neo Geo joysticks, the Mahjong Controller, a four-player extension board, V-Liner, and the Irritating Maze trackball.
System settings: Settings allow selection of AES, MVS, or Universe BIOS mode, CD system, region, free play, memory card options, palette, and aspect ratio.
Accuracy: The emulator synchronizes its CPUs with video and sound components, while video event timing is described as best effort and cycle-accurate rendering remains a longer-term goal.
Known limits: Dedicated JAMMA PCB systems and PAL mode are not supported, and an early Stakes Winner prototype cannot currently be emulated due to missing data.
Build platforms: The project README gives build instructions for Linux, macOS, BSD, and Windows using MSYS2.
API integration: Geolith is written for The Jolly Good API and requires that API's header files to compile.
License: The README identifies Geolith as BSD-3-Clause licensed.
Latest changelog entry: Version 0.4.2 lists a fix for an LSPC state leak when switching between CD and cartridge games and support for The Jolly Good API 2.0.0.
Project purpose: Jolly Good Emulation describes itself as a preservation-oriented emulation project focused on reusability, simplicity, and readable code.
Maintainer: The README credits Rupert Carmichael with Geolith copyright from 2022 through 2026.

Where it ranks on The Geeks Club

Best NES Emulators in 2026#9 of 26
Best Neo Geo Emulators in 2026#7 of 18

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Sources

gitlab.com/jgemu/geolith/-/raw/master/README· checked 29 Sept 2026
gitlab.com/jgemu/geolith/-/raw/master/ChangeLog· checked 29 Sept 2026
jgemu.gitlab.io· checked 29 Sept 2026
gitlab.com/jgemu/geolith· checked 30 Sept 2026