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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 569 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]

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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: Wait cycle 23:23, 1 October 2024 NGH number 11:54, 17 June 2024 Z80 port map 09:19, 28 January 2024 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: Sprite graphics format 06:24, 10 July 2024 VRAM 00:42, 15 March 2024 Eyecatcher 20:41, 26 November 2023 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: ADPCM 15:17, 15 March 2025 CDDA 03:49, 10 February 2025 Z80 port map 09:19, 28 January 2024 Pages in category: 28	File:Ban tools.jpg Repairing Troubleshooting dead or glitchy MVS boards, CD laser assemblies, cartridges... Last edits: Graphic glitches 16:46, 24 February 2025 SLOT6 board 20:59, 23 June 2024 NEO-273 21:17, 15 June 2024 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: Cartridge ROM arrangements 15:32, 23 February 2025 Schematics 13:18, 23 November 2024 SLOT6 board 20:59, 23 June 2024 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 commands 04:54, 10 February 2025 CDDA 03:49, 10 February 2025 PRG file 17:50, 2 January 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: Vector table swap 05:39, 3 January 2025 Loading files 17:45, 2 January 2025 Development tools 19:34, 9 February 2024 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-PCM2 15:09, 13 March 2025 Cartridge ROM arrangements 15:32, 23 February 2025 NEO-CMC 05:42, 3 January 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 14:02, 31 March 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 ?