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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 528 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 May 2017

     17:31 (User creation log) . . User account Puddingpimp (talk | contribs) was created by Furrtek (talk | contribs) and password was sent by email ‎
     07:14  CD drive commands‎ (diff | hist) . . (+2,799). . Furrtek (talk | contribs)


Ban base.jpg

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

Last edits:
Battery-backed RAM04:48, 12 May 2017
68k instructions timings01:44, 11 May 2017
Z80 port map05:06, 2 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:
Sprite graphics format05:25, 12 May 2017
Colors05:03, 12 May 2017
GPU23:55, 10 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:
Z80 port map05:06, 2 May 2017
Sphero Symphony02:47, 5 April 2017
Z80 interrupts23:07, 18 February 2017

Pages in category: 30

Ban tools.jpg

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

Last edits:
DISC I/O ERROR21:13, 13 May 2017
Signals13:06, 16 April 2017
Slowdown20:38, 13 March 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:
Fusion converter04:46, 12 May 2017
Neo Print01:22, 11 May 2017
Bootleg MVS boards21:19, 13 April 2017

Pages in category: 87

Ban cd.jpg

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

Last edits:
CD drive commands07:14, 21 May 2017
Game CD structure21:15, 13 May 2017
DISC I/O ERROR21:13, 13 May 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:
PLAYER START subroutine21:04, 14 May 2017
Common pitfalls21:16, 13 May 2017
Burning CDs21:11, 13 May 2017

Pages in category: 56

Ban chips.jpg

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

Last edits:
NEO-CDD board04:58, 12 May 2017
Battery-backed RAM04:48, 12 May 2017
Fusion converter04:46, 12 May 2017

Pages in category: 103

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

Last edits:
The King of Fighters '98 - The Slugfest20:36, 13 April 2017
Fast Striker03:28, 30 March 2017
Meg count03:15, 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 ?