User:Rom1
The NeoGeo Development Wiki
This wiki is about every technical aspects of the SNK NeoGeo hardware and software (AES, MVS, CD and CDZ).
Our aim is to provide the most detailed, accurate and up to date information for preservation, homebrew development and repairs.
What's common to every NeoGeo system: main architecture, data formats...
| BIOS RAM locations | 21:25, 11 August 2025 |
| Pinouts | 15:34, 23 July 2025 |
| Memory mapped registers | 19:21, 10 April 2025 |
How graphics are handled and displayed, from bitplanes and colors to the video output.
| Slowdown | 07:12, 12 September 2025 |
| Fix bankswitching | 21:25, 14 May 2025 |
| Sprites | 21:18, 14 May 2025 |
Everything related to music and sound effects: The Z80 subsystem, synthesized and sampled sound, CDDA playback...
Troubleshooting dead or glitchy MVS boards, CD laser assemblies, cartridges...
| Replacement chip | 20:21, 25 January 2026 |
| CD drive | 07:36, 1 November 2025 |
| List of ROM chips | 00:03, 26 September 2025 |
Particularities of the AES and MVS systems: ROM types, memory cards, cab I/O, data security... Also cartridge boards information.
| Category:Cartridge boards | 13:23, 10 January 2026 |
| Cartridges | 18:19, 7 January 2026 |
| PROG board | 07:40, 7 January 2026 |
NeoGeo CD and CDZ specificities: Differences and limitations, new memory functions, CDDA...
| CD drive | 07:36, 1 November 2025 |
| CDROM-2 board | 01:49, 18 August 2025 |
| CD hardware versions | 01:44, 18 August 2025 |
Code snippets, register definitions, guides on how to display stuff, use the system ROM, play music and sounds, read user input...
| Development tools | 14:00, 6 October 2025 |
| PLAYER START subroutine | 12:00, 6 October 2025 |
| Slowdown | 07:12, 12 September 2025 |
What makes everything work (or not). Schematics, chip pinouts and functions, troubleshooting hardware issues...
| Replacement chip | 20:21, 25 January 2026 |
| NEO-SMA | 15:37, 15 January 2026 |
| NEO-CMC | 23:04, 10 January 2026 |
Remarquable games for some of their technical aspects: special effects, unusual hardware use, hidden features...
| The King of Fighters '99 - Millennium Battle | 15:07, 15 January 2026 |
| Garou - Mark of the Wolves | 15:06, 15 January 2026 |
| Metal Slug 3 | 15:05, 15 January 2026 |
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25 January 2026
About this wiki
- The wiki has 579 pages thanks to our contributors
- 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]
- 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 ?