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Welcome to the NeoGeo Development Wiki

This wiki is about every technical aspect of the SNK NeoGeo hardware and software (AES, MVS, CD and CDZ).

Its aim is to provide the most detailed, accurate and up to date information, to help homebrew development and repairs.
The wiki has 574 pages. Contributors list. Hosting provided by ElBarto.
Don't know where to start ? Try here. Can't find what you're looking for ? Try our links.

Want to help ? Just register or join us on IRC ! [Freenode #neogeodev]

Recent changes (minor edits hidden)

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Categories

File:Ban base.jpg Base system What's common to every NeoGeo systems: main architecture, data formats, BIOS functions... Last edits: BIOS RAM locations 21:25, 11 August 2025 Pinouts 15:34, 23 July 2025 Memory mapped registers 19:21, 10 April 2025 Pages in category: 42	File:Ban video.jpg Video system How graphics are handled and displayed, from bitplanes and colors to the video output. Last edits: Slowdown 07:12, 12 September 2025 Fix bankswitching 21:25, 14 May 2025 Sprites 21:18, 14 May 2025 Pages in category: 36	File:Ban audio.jpg Audio system Everything related to music and sound effects: The Z80 subsystem, synthesized and sampled sound, CDDA playback... Last edits: NEO-ZMC 15:45, 1 May 2025 ADPCM 15:17, 15 March 2025 CDDA 03:49, 10 February 2025 Pages in category: 28	File:Ban tools.jpg Repairing Troubleshooting dead or glitchy MVS boards, CD laser assemblies, cartridges... Last edits: CD drive 07:36, 1 November 2025 List of ROM chips 00:03, 26 September 2025 Graphic glitches 16:46, 24 February 2025 Pages in category: 45
File:Ban cart.jpg Cart systems Particularities of the AES and MVS systems: ROM types, memory cards, cab I/O, data security... Also cartridge boards information. Last edits: PROG board 00:23, 27 September 2025 NEO-FTC1B board 20:36, 19 September 2025 CHA board 19:25, 6 September 2025 Pages in category: 106	File:Ban cd.jpg CD systems NeoGeo CD and CDZ specificities: Differences and limitations, new memory functions, CDDA... Last edits: CD drive 07:36, 1 November 2025 CDROM-2 board 01:49, 18 August 2025 CD hardware versions 01:44, 18 August 2025 Pages in category: 48	File:Ban code.jpg Software Code snippets, register definitions, guides on how to display stuff, use BIOS functions, play music and sounds, read user input... Last edits: Development tools 14:00, 6 October 2025 PLAYER START subroutine 12:00, 6 October 2025 Slowdown 07:12, 12 September 2025 Pages in category: 60	File:Ban chips.jpg Electronics What makes everything work (or not), physically. Schematics, chip pinouts and functions, troubleshooting hardware issues... Last edits: NEO-E0 19:18, 19 November 2025 CD drive 07:36, 1 November 2025 PROG board 00:23, 27 September 2025 Pages in category: 109
Games Remarquable games for some of their technical aspects: special effects, unusual hardware use, hidden features... Last edits: Slot check security 06:36, 28 October 2025 Super Bubble Pop 03:56, 6 April 2023 Puzzle Bobble 01:55, 6 April 2023 Pages in category: 241

How to edit, guidelines, available templates, suggestions: The wiki

Todo

• See wanted pages, old pages, short pages, and Todo/Mysteries.
• Publish asm highlighter for ConTEXT
• Make subcategories, move/merge "BIOS calls"
• More schematics, chip details/pinouts
• Troubleshooting tips
• Make a downloadable offline capture every few months ?