Geolith vs GxGeo

Geolith is a free emulator for the Neo Geo AES, MVS, CD, and CDZ. It supports commercially released AES, MVS, and CD games, and runs on Linux, macOS, BSD, and Windows. Cartridge systems accept TerraOnion .NEO files; CD systems use .bin/.cue and can optionally use .chd images. BIOS files from a recent MAME set are required, with the needed archives varying by system. Geolith synchronizes its CPUs with the video and sound systems, though video event timing is best effort and cycle-accurate rendering remains a longer-term goal. Settings include system and BIOS mode, region, free play, memory card options, palette, and aspect ratio. Supported inputs range from Neo Geo joysticks to a Mahjong Controller, four-player extension board, V-Liner, and the Irritating Maze trackball. The project was written for The Jolly Good API and can be used in multi-emulator frameworks or standalone binaries. It does not support dedicated JAMMA PCB systems or PAL mode; an early Stakes Winner prototype is also unsupported because required data is missing.

GxGeo is a free Wii-family emulator for Neo-Geo AES and MVS games. It is a port of the open-source GnGeo emulator and is licensed under GPLv2. Supported platforms listed are Wii, vWii mode on Wii U, and Wii Mini. The project is described as an early version with some bugs. ROMs larger than 25 MB do not work because of memory limitations, although some ROMs can be modified to run. Installation requires extracting the ZIP to an SD card and placing zipped ROMs and BIOS files in /sd/gxgeo/roms. The instructions require 000-lo.lo and sfix.sfx, and describe country and system BIOS files; uni-bios.rom can substitute for a country or system file. Play is supported through a GameCube controller or Wii Remote. A GameCube controller in port 1 takes priority for player 1, while the Wiimote controls player 2. Downloads are linked through Google Code, Homebrew Browser, and Open Shop Channel. Open Shop Channel lists version 20101119.