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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 438 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)

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:
NGH number13:00, 7 August 2015
Neopen BIOS06:53, 7 May 2015
BIOS RAM locations10:22, 16 March 2015

Pages in category: 33

Ban video.jpg

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

Last edits:
VRAM17:42, 1 October 2015
Sprites20:24, 31 January 2015
Auto animation20:22, 31 January 2015

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:
CDDA10:00, 28 April 2015
YM2610 registers10:12, 12 April 2015
Sound driver23:04, 26 October 2014

Pages in category: 17

Ban tools.jpg

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

Last edits:
Graphic glitches08:54, 1 March 2014
SLOT6 board07:00, 6 January 2013
Repairing Metal Slug X11:35, 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:
Daedalus converter15:04, 14 August 2015
MVS cartridge pinout01:44, 26 November 2014
HD630116:58, 2 November 2014

Pages in category: 58

Ban cd.jpg

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

Last edits:
CDZ13:19, 18 August 2015
Loading time13:59, 14 August 2015
CDDA10:00, 28 April 2015

Pages in category: 37

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:
Homebrew software17:15, 14 July 2015
Making scrollable backgrounds10:18, 5 June 2015
Development tools06:55, 5 June 2015

Pages in category: 50

Ban chips.jpg

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

Last edits:
NEO-SDR-T16:31, 8 June 2015
HD630116:58, 2 November 2014
PCM17:52, 27 October 2014

Pages in category: 98

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

Last edits:
Twinkle Star Sprites13:15, 18 August 2015
Double Dragon15:35, 14 August 2015
Fight Fever15:33, 14 August 2015
Pages in category: 228

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 ?