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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 timings18:39, 17 September 2017
68k program header23:45, 11 September 2017
Memory speed06:35, 6 September 2017
44 pages

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

Last edits
Fix layer21:22, 16 September 2017
Palette RAM12:05, 5 September 2017
VRAM11:57, 5 September 2017
36 pages

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

Last edits
Z80 ERROR00:30, 20 September 2017
YM261020:19, 26 July 2017
FM17:12, 26 June 2017
31 pages

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

Last edits
Z80 ERROR00:30, 20 September 2017
Screws18:06, 16 September 2017
Memory speed06:35, 6 September 2017
35 pages

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

Last edits
MVS cartridge pinout18:31, 18 September 2017
V ROM06:05, 6 September 2017
MV-LED23:14, 15 August 2017
87 pages

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

Last edits
Logo file00:47, 12 September 2017
IPL file18:18, 10 September 2017
LC895323:41, 25 August 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
68k instructions timings18:39, 17 September 2017
68k program header23:45, 11 September 2017
68k exception handling02:37, 27 August 2017
57 pages

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

Last edits
NEO-24408:32, 21 September 2017
NEO-25319:07, 18 September 2017
Memory speed06:35, 6 September 2017
103 pages

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

Last edits
The King of Fighters '9621:30, 20 August 2017
Slot check security00:40, 24 June 2017
The King of Fighters '98 - The Slugfest20:36, 13 April 2017
237 pages

Recent changes (minor edits hidden)

21 September 2017

     08:32  NEO-244‎ (diff | hist) . . (+217). . Furrtek (talk | contribs)

18 September 2017

     19:07  NEO-253‎ (diff | hist) . . (+367). . Furrtek (talk | contribs) (Finished MV4F pinouts)
     18:13 (Upload log) . . Furrtek (talk | contribs) uploaded a new version of File:Neo-grc2 pinout.png(Rotated)

17 September 2017

     21:09  Main Page‎ (diff | hist) . . (-2,214). . Rom1 (talk | contribs) (Change home layout (l'an 3000 !))

About this wiki

Todo

  • 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 ?