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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
SNK Patents00:04, 28 March 2018
Memory mapped registers12:26, 11 February 2018
Pinouts03:40, 28 January 2018
44 pages

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

Last edits
Palette RAM06:57, 6 April 2018
CXA114506:24, 26 March 2018
Colors14:03, 20 March 2018
35 pages

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

Last edits
Power amp21:16, 9 April 2018
Sound driver17:00, 26 January 2018
Z80 ERROR00:30, 20 September 2017
31 pages

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

Last edits
Power amp21:16, 9 April 2018
MV2F17:03, 15 February 2018
Repairing King of Fighters '9823:02, 6 January 2018
36 pages

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

Last edits
CHA42G22:12, 23 April 2018
161-in-1 Series 115:31, 12 April 2018
V ROM05:27, 12 April 2018
96 pages

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

Last edits
OBJ file04:32, 27 March 2018
Copy protection23:50, 7 October 2017
Burning CDs05:54, 6 October 2017
47 pages

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

Last edits
Development tools21:27, 8 April 2018
Optimization08:20, 3 April 2018
Security code12:20, 31 March 2018
59 pages

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

Last edits
NEO-B119:47, 17 April 2018
PCM05:31, 12 April 2018
V ROM05:27, 12 April 2018
103 pages

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

Last edits
161-in-1 Series 115:31, 12 April 2018
Ghostlop (prototype)01:11, 11 March 2018
World Heroes 2 Jet04:53, 4 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 ?