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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.

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

Last edits
68k instructions timings17:44, 25 November 2018
Battery-backed RAM21:50, 12 November 2018
System self-test06:23, 8 November 2018
44 pages

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

Last edits
Palettes04:46, 12 December 2018
Rendering logic22:44, 5 December 2018
Slowdown07:17, 24 November 2018
36 pages

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

Last edits
SM117:02, 10 November 2018
Z8004:45, 21 September 2018
CDDA17:21, 13 September 2018
31 pages

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

Last edits
NEO-25703:40, 28 November 2018
NEO-27303:12, 28 November 2018
Repair help07:25, 24 November 2018
41 pages

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

Last edits
PROG board20:41, 28 November 2018
SNK history02:13, 22 November 2018
MV1-121:40, 17 November 2018
100 pages

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

Last edits
PAT file17:27, 6 November 2018
CDDA17:21, 13 September 2018
LC7881519:48, 6 September 2018
46 pages

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

Last edits
68k instructions timings17:44, 25 November 2018
Slowdown07:17, 24 November 2018
Scaling sprite groups08:33, 13 October 2018
61 pages

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

Last edits
NEO-24419:49, 2 December 2018
PROG board20:41, 28 November 2018
NEO-25703:40, 28 November 2018
104 pages

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

Last edits
Fatal Fury 211:55, 22 October 2018
Robo Army15:14, 12 August 2018
161-in-1 Series 118:25, 15 July 2018
239 pages

Recent changes (minor edits hidden)

No changes during the given period match these criteria.

About this 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 ?