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Welcome to 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.
The wiki has 529 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]

Recent changes (minor edits hidden)

26 July 2017


(Upload log). .

[Furrtek‎ (2×)]



. . Furrtek (talk | contribs) uploaded File:YM2610.odg



. . Furrtek (talk | contribs) uploaded a new version of File:Ym2610 pinout.png(Rotated and added signal directions)


Ban base.jpg

What's common to every NeoGeo system: main architecture, data formats, ...

Last edits:
68k memory map00:45, 24 June 2017
System ROM00:44, 24 June 2017
68k program header22:26, 28 May 2017

Pages in category: 43

Ban video.jpg

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

Last edits:
Fix graphics format11:51, 26 June 2017
Sprite graphics format05:25, 12 May 2017
Colors05:03, 12 May 2017

Pages in category: 36

Ban audio.jpg

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

Last edits:
YM261020:19, 26 July 2017
FM17:12, 26 June 2017
ADPCM17:11, 26 June 2017

Pages in category: 31

Ban tools.jpg

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

Last edits:
CD drive07:06, 1 June 2017
DISC I/O ERROR21:13, 13 May 2017
Signals13:06, 16 April 2017

Pages in category: 34

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:
CHA board00:57, 24 June 2017
PROG board00:57, 24 June 2017
JAMMA connector pinout21:25, 7 June 2017

Pages in category: 87

Ban cd.jpg

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

Last edits:
PAT file01:50, 18 June 2017
Logo file02:27, 13 June 2017
CD drive07:06, 1 June 2017

Pages in category: 47

Ban code.jpg

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

Last edits:
Security code12:50, 8 July 2017
YM2610 registers20:23, 24 June 2017
Transparency effects11:35, 24 June 2017

Pages in category: 57

Ban chips.jpg

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

Last edits:
YM261020:19, 26 July 2017
CHA board00:57, 24 June 2017
PROG board00:57, 24 June 2017

Pages in category: 103

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

Last edits:
Slot check security00:40, 24 June 2017
The King of Fighters '98 - The Slugfest20:36, 13 April 2017
Fast Striker03:28, 30 March 2017
Pages in category: 237

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 ?