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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 429 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]

UNIQdc57c448c33f118d-h-1--QINURecent changes (minor edits hidden)

No changes during the given period matching these criteria.


Ban base.jpg

What's common to every NeoGeo systems: main architecture, data formats, BIOS functions...

Last edits:
Memory mapped registers20:45, 3 March 2014
BIOS RAM locations13:02, 6 February 2014
68k program header18:09, 1 February 2014

Pages in category: 30

Ban video.jpg

How graphics are handled and displayed, from bitplanes and colors to the video output.

Last edits:
Horizontal reduction13:52, 5 January 2014
Sprites13:42, 5 January 2014
GPU04:00, 5 January 2014

Pages in category: 20

Ban audio.jpg

Everything related to music and sound effects: The Z80 subsystem, synthesized and sampled sound, CDDA playback...

Last edits:
ADPCM codecs00:34, 17 March 2014
YM261018:29, 5 January 2014
YM2610 bus timing08:57, 7 January 2013

Pages in category: 17

Ban tools.jpg

Troubleshooting dead or glitchy MVS boards, CD laser assemblies, cartridges...

Last edits:
Graphic glitches06:54, 1 March 2014
SLOT6 board05:00, 6 January 2013
Repairing Metal Slug X09:35, 24 September 2012

Pages in category: 8

Ban cart.jpg

Particularities of the AES and MVS systems: ROM types, memory cards, cab I/O, data security... Also cartridge boards information.

Last edits:
Fusion converter20:12, 26 February 2014
MVS cartridge pinout16:36, 5 January 2014
AES cartridge pinout16:36, 5 January 2014

Pages in category: 58

Ban cd.jpg

NeoGeo CD and CDZ specificities: Differences and limitations, new memory functions, CDDA...

Last edits:
DMA18:03, 1 March 2014
Logo file18:27, 9 January 2014
AXT file09:11, 28 December 2013

Pages in category: 35

Ban code.jpg

Code snippets, register definitions, guides on how to display stuff, use BIOS functions, play music and sounds, read user input...

Last edits:
Memory mapped registers20:45, 3 March 2014
USER subroutine01:40, 2 February 2014
68k program header18:09, 1 February 2014

Pages in category: 49

Ban chips.jpg

What makes everything work (or not), physically. Schematics, chip pinouts and functions, troubleshooting hardware issues...

Last edits:
NEO-B109:00, 4 March 2014
LC895317:59, 1 March 2014
Fusion converter20:12, 26 February 2014

Pages in category: 98

Remarquable games for some of their technical aspects: special effects, unusual hardware use, hidden features...

Last edits:
Slot check security02:55, 8 October 2013
The King of Fighters '9415:35, 6 October 2013
NAM-197514:37, 28 June 2013
Pages in category: 221

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


  • 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 ?