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Neo Geo modding wiki

Explore Neo Geo modding, repairs, homebrew, hardware upgrades, and technical references. Find a guide for your console and follow the steps.

Neo Geo logo.svg Neo Geo MVS.png Neo Geo AES logo.png Neo Geo CD logo.svg

Neo Geo AES.png Neo-Geo-CD-TopLoader-wController-FL.png Neo Geo CD Front-Loader.png Neo Geo CDZ.png

The Neo Geo is a cartridge-based arcade system from the fourth generation of video game consoles. The console was launched to arcades as the Multi Video System (MVS) in Japan on April 26th, 1990 followed by releases in North America (August 22nd, 1990), and Europe (1991). Variants of the arcade console may have 1, 2, 4, or 6 cartridge slots for games that can be chosen by the player. Many people "consolize" MVS boards to be playable on a home television by either using a JAMMA-based "supergun" or manually wiring the needed parts.

On July 1st, 1991, the console was launched in a different form factor to the home market as the Advanced Entertainment System (AES), becoming the most powerful machine of the fourth generation of consoles. A version of the AES that uses CDs instead of cartridges — the Neo Geo CD — was released in 1994 worldwide along with a front-loading variant in Japan. A slightly improved "Neo Geo CDZ" was then released in Japan in 1996, offering a faster-loading CD drive but including a overheating flaw. A handful of exclusive titles were released straight to Neo Geo CD.

The NeoGeo Development Wiki is a great supplemental development-focused resource to this wiki.

All guides

23 tutorials
Neo GeoNeo Geo:Audio Bypass Mod (AES)Unfortunately, motherboard revisions 3-3 and 3-4 had flaws in their audio circuits causing audio buzz through the headphone jack, requ…Updated Oct 9, 2026Neo GeoNeo Geo:Battery ReplacementThe original battery in a Neo Geo MVS is a rechargeable coin-cell battery that is soldered in. Over time, these degrade and leak onto …Updated Oct 9, 2026Neo GeoNeo Geo:Chip ReplacementsSome chips on Neo Geo motherboards or cartridges can go bad. Luckily, there are some drop-in replacements for these chips. Symptoms NE…Updated Oct 9, 2026Neo GeoNeo Geo:Connector PinoutsOriginally from Neo Geo Dev wiki, provided here for convenience. JAMMA Edge Top Pin Pin Bottom GND 1 A GND GND 2 B GND +5V 3 C +5V +5V…Updated Oct 9, 2026Neo GeoNeo Geo:Consolization/MV-1A(CH)(CHX)(X)This page is a guide to consolize a MV-1A, MV-1ACH, MV-1ACHX, or MV-1AX motherboard to add controller support and the ability to outpu…Updated Oct 9, 2026Neo GeoNeo Geo:Controller AdaptersBelow are options for adapting controllers to the Neo Geo AES DB15 port or for use with a supergun or consolized system with DB15 port…Updated Oct 9, 2026Neo GeoNeo Geo:DIP SwitchesBelow are the effects of enabling the different DIP switches. Information from the Neo Geo Development Wiki. For an at-home single-mac…Updated Oct 9, 2026Neo GeoNeo Geo:General TroubleshootingThis page serves as a starting point for troubleshooting general errors with your Neo Geo MVS. If all else fails, you can check the op…Updated Oct 9, 2026Neo GeoNeo Geo:General Troubleshooting (AES)Unstable Image / Losing Sync If you are losing sync on your AES, especially when a bright screen is displayed, you may need to recap t…Updated Oct 9, 2026Neo GeoNeo Geo:Homebrew Games ListBelow is a list of homebrew games and tools for the Neo Geo. This list originated from this forum post. Homebrew Games Game Name Devel…Updated Oct 9, 2026Neo GeoNeo Geo:Killer Standoff Fix (AES)The effects of the "killer standoff" on an AES motherboard, with numerous traces being severed as a result. The top shell of the Neo G…Updated Oct 9, 2026Neo GeoNeo Geo:Monitor Test PatternsSimilar to the 240p Test Suite that's available for other consoles, there exists a set of test patterns to dial in color and geometry …Updated Oct 9, 2026Neo GeoNeo Geo:Neo Geo CD CSYNC ModNote: There is not a known working Neo Geo CD CSYNC Mod. There is a Sync on Luma mod that is working, but the CSYNC mod listed below d…Updated Oct 9, 2026Neo GeoNeo Geo:Neo Geo CD Exclusive GamesThe following games are exclusive to the Neo Geo CD either as a whole, in the home market, or in the Neo Geo family.[1] Games Exclusiv…Updated Oct 9, 2026Neo GeoNeo Geo:Omega MVSThe ArcadeWorks Omega MVS is a custom case and supergun for a Neo Geo MV1C MVS motherboard with UNIVERSE BIOS (UniBIOS) pre-installed.…Updated Oct 9, 2026Neo GeoNeo Geo:Open MVSThe Open MVS is a kit designed to consolize Neo Geo MV1C arcade boards. It's made up of a multi-piece 3D printed case, designed to giv…Updated Oct 9, 2026Neo GeoNeo Geo:Pause Button ModWhile arcade games are not meant to be paused by the player, DIP switch 8 on MVS units which — when flipped to the ON position — pause…Updated Oct 9, 2026Neo GeoNeo Geo:Power Supply WiringSuzohapp 80-0064-00 power supply Generally, superguns have a 6 pin JST connector used for power. Therefore, you will need an external …Updated Oct 9, 2026Neo GeoNeo Geo:RGB Bypass Mod (AES)This page will show you a "basic" RGB bypass for the Neo Geo AES console that eliminates the Sony CXA amp and sends RGBS video (at the…Updated Oct 9, 2026Neo GeoNeo Geo:Test ModeIf you set DIP 1 to ON, then turn on the console, it will boot into Test Mode. You will be presented with options which correspond to …Updated Oct 9, 2026Neo GeoNeo Geo:UNIVERSE BIOS (UniBIOS)UniBIOS menu. The UNIVERSE BIOS (UniBIOS for short) is a custom bios that can be used on MVS and AES hardware. The main reason for ins…Updated Oct 9, 2026Neo GeoNeo Geo:Video CablesAll Neo Geo home systems output RGB without any modification. MVS motherboards can be "consolized" for home use and use the same cable…Updated Oct 9, 2026Neo GeoNeo Geo:Video Output NotesAES and MVS Both the AES and MVS output effectively the same video signals, as they are based on the same hardware. Some revisions are…Updated Oct 9, 2026