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Welcome to the NeoGeo Development Wiki

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

Its aim is to provide the most accurate and up to date information, to help homebrew development and repairs.

The wiki has 569 pages. Contributors list.

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... Temporary category. 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: Z80 port map 09:19, 28 January 2024 NEO-ZMC 09:16, 28 January 2024 Z80 08:21, 28 January 2024 Pages in category: 28	File:Ban chips.jpg Electronics What makes everything work (or not), physically. Schematics, chip pinouts and functions, troubleshooting hardware issues... Last edits: NEO-CMC 05:42, 3 January 2025 NEO-C1 02:38, 29 November 2024 Schematics 13:18, 23 November 2024 Pages in category: 109
File:Ban cart.jpg Cart systems Particularities of the AES and MVS systems: ROM types, memory cards, cab I/O, data security... Last edits: Schematics 13:18, 23 November 2024 SLOT6 board 20:59, 23 June 2024 Neo Print 19:18, 21 March 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: PRG file 17:50, 2 January 2025 Loading files 17:45, 2 January 2025 ACM file 17:31, 2 January 2025 Pages in category: 48	File:Ban code.jpg Code & HowTo's 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 tools.jpg Tools Assemblers, emulators, utilities, cheatsheets, automations... Anything handy for developement. Last edits: Official development manual 00:51, 13 January 2025 Neo Sprite Viewer 02:35, 18 December 2023 Emulators 18:37, 15 August 2023 Pages in category: 12
Games Remarquable games for some of their technical aspects: special effects, unusual hardware use, hidden features... Last edits: Super Bubble Pop 03:56, 6 April 2023 Puzzle Bobble 01:55, 6 April 2023 Neo 2048 18:17, 11 March 2023 Pages in category: 241

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

Todo

• See wanted pages, old pages, short pages, and Mysteries.
• Make subcategories
• More schematics, chip details/pinouts
• Troubleshooting tips
• Make a downloadable offline capture every few months (a complete backup is done every month)
• ...