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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 520 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)

21 February 2017

     01:00 (Move log) . . Furrtek (talk | contribs) moved page MV-1A to MV1A without leaving a redirect ‎

19 February 2017


(Upload log). .

[Furrtek‎ (2×)]



. . Furrtek (talk | contribs) uploaded a new version of File:Neo-sdr pinout.png



. . Furrtek (talk | contribs) uploaded a new version of File:Fixref01.png

N    11:04  Service button‎ (diff | hist) . . (+115). . Furrtek (talk | contribs) (Created page with "Brings up the system ROM menu. The input is read through {{Reg|REG_STATUS_A}}. Category:Cartridge systems")


Ban base.jpg

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

Last edits:
System ROM11:05, 19 February 2017
Memory mapped registers10:47, 19 February 2017
Power requirements03:59, 10 February 2017

Pages in category: 42

Ban video.jpg

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

Last edits:
P bus07:35, 16 January 2017
Fix layer07:25, 16 January 2017
S ROM07:24, 16 January 2017

Pages in category: 34

Ban audio.jpg

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

Last edits:
Z80 interrupts22:07, 18 February 2017
LC7881511:02, 18 February 2017
FM10:59, 18 February 2017

Pages in category: 28

Ban tools.jpg

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

Last edits:
Hardware test10:36, 19 February 2017
MV-LED09:57, 19 February 2017
MV-ELA09:54, 19 February 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:
MVS board types01:02, 21 February 2017
MV1A01:00, 21 February 2017
JAMMA connector pinout13:35, 19 February 2017

Pages in category: 86

Ban cd.jpg

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

Last edits:
LC7881511:02, 18 February 2017
Burning a game CD04:35, 16 February 2017
DISC I/O ERROR04:29, 16 February 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:
Hello world tutorial11:07, 19 February 2017
Memory mapped registers10:47, 19 February 2017
Optimization11:09, 18 February 2017

Pages in category: 55

Ban chips.jpg

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

Last edits:
NEO-MGA01:05, 21 February 2017
NEO-BUF01:04, 21 February 2017
SFIX ROM12:38, 19 February 2017

Pages in category: 103

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

Last edits:
Art of Fighting00:16, 1 November 2016
2020 Super Baseball00:11, 1 November 2016
The King of Fighters '98 - The Slugfest23:31, 31 October 2016
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 ?