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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
Z8008:33, 10 September 2018
Pinouts20:59, 6 September 2018
System self-test06:48, 24 August 2018
44 pages

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

Last edits
Palettes21:01, 30 June 2018
Sticky bit00:45, 24 June 2018
Layer00:38, 24 June 2018
36 pages

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

Last edits
CDDA18:21, 13 September 2018
Z8008:33, 10 September 2018
LC7881520:48, 6 September 2018
31 pages

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

Last edits
Graphic glitches02:42, 4 September 2018
System self-test06:48, 24 August 2018
NEO-CDA board08:51, 12 August 2018
40 pages

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

Last edits
MV1FZS10:02, 25 August 2018
MVS board types16:14, 29 July 2018
MV4FT16:01, 29 July 2018
100 pages

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

Last edits
CDDA18:21, 13 September 2018
LC7881520:48, 6 September 2018
Logo file02:27, 14 May 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 interrupts19:01, 30 July 2018
Memory mapped registers18:52, 30 July 2018
68k vector table18:01, 30 July 2018
59 pages

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

Last edits
NEO-I023:35, 17 September 2018
PCM09:04, 10 September 2018
NEO-G008:44, 10 September 2018
104 pages

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

Last edits
Robo Army16:14, 12 August 2018
161-in-1 Series 119:25, 15 July 2018
Ghostlop (prototype)01:11, 11 March 2018
239 pages

Recent changes (minor edits hidden)

No changes during the given period matching 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 ?