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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...
| Z80 | 01:14, 19 August 2026 |
| Clock | 22:09, 17 August 2026 |
| Wait cycle | 19:49, 15 August 2026 |
How graphics are handled and displayed, from bitplanes and colors to the video output.
| Sprite graphics format | 02:57, 19 August 2026 |
| Sprite shrinking | 03:23, 20 July 2026 |
| Rendering logic | 21:37, 18 July 2026 |
Everything related to music and sound effects: The Z80 subsystem, synthesized and sampled sound, CDDA playback...
| Z80 bankswitching | 01:22, 19 August 2026 |
| Z80 | 01:14, 19 August 2026 |
| NEO-ZMC | 00:39, 19 August 2026 |
Troubleshooting dead or glitchy MVS boards, CD laser assemblies, cartridges...
| Memory speed | 20:32, 21 July 2026 |
| Z80 ERROR | 18:05, 12 July 2026 |
| NEO-BUF | 13:48, 8 June 2026 |
Particularities of the AES and MVS systems: ROM types, memory cards, cab I/O, data security... Also cartridge boards information.
| NEO-HYCS | 09:59, 24 August 2026 |
| NEO-FTC1B board | 21:39, 2 August 2026 |
| Output port | 21:37, 2 August 2026 |
NeoGeo CD and CDZ specificities: Differences and limitations, new memory functions, CDDA...
| Game CD structure | 09:04, 9 July 2026 |
| LC78815 | 06:14, 26 June 2026 |
| CD drive | 09:36, 1 November 2025 |
Code snippets, register definitions, guides on how to display stuff, use the system ROM, play music and sounds, read user input...
| Memory mapped registers | 12:33, 12 August 2026 |
| 68k ASM defines | 12:10, 12 August 2026 |
| Displaying credits | 03:31, 22 July 2026 |
What makes everything work (or not). Schematics, chip pinouts and functions, troubleshooting hardware issues...
Game technical data and oddities such as use of special effects, unusual hardware...
| Slot check security | 16:47, 15 August 2026 |
| Puzzle Bobble | 23:22, 14 August 2026 |
| Top Player's Golf | 09:02, 9 July 2026 |
About this wiki
- The wiki has 581 pages thanks to our contributors
- Hosting provided by Furrtek, previously by ElBarto for 15 years !
- Don't know where to start ? Try here
- Can't find what you're looking for ? Try our links
- Want to help ? Just register !
- How to edit, guidelines, available templates, suggestions: The wiki
Todo
- See wanted pages, old pages, short pages, and Todo/Mysteries.
- Make subcategories, move/merge "BIOS calls"
- Better troubleshooting tips
- Make a downloadable offline capture every few months ?