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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
Software DIPs04:34, 21 October 2017
Battery-backed RAM04:34, 21 October 2017
Power supply19:22, 13 October 2017
44 pages

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

Last edits
Eyecatcher04:54, 21 October 2017
S ROM04:35, 21 October 2017
Fix layer21:22, 16 September 2017
36 pages

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

Last edits
Power amp23:05, 26 September 2017
Z80 ERROR00:30, 20 September 2017
YM261020:19, 26 July 2017
31 pages

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

Last edits
RAM chip04:43, 21 October 2017
System self-test08:53, 10 October 2017
Power amp23:05, 26 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
JAMMA connector pinout04:38, 21 October 2017
Backup RAM04:38, 21 October 2017
S ROM04:35, 21 October 2017
89 pages

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

Last edits
Copy protection23:50, 7 October 2017
Burning CDs05:54, 6 October 2017
Logo file00:47, 12 September 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
Eyecatcher04:54, 21 October 2017
USER subroutine04:36, 21 October 2017
Displaying sprites18:25, 6 October 2017
58 pages

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

Last edits
RAM chip04:43, 21 October 2017
S ROM04:35, 21 October 2017
Battery-backed RAM04:34, 21 October 2017
103 pages

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

Last edits
Windjammers02:37, 23 September 2017
Voltage Fighter - Gowcaizer02:37, 23 September 2017
Viewpoint02:37, 23 September 2017
237 pages

Recent changes (minor edits hidden)

21 October 2017

N    04:40  MVS‎ (diff | hist) . . (+26). . Furrtek (talk | contribs) (Redirected page to MVS hardware)
     04:25 (Deletion log) . . Furrtek (talk | contribs) deleted page MVS systems(RAS syndrome)

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 ?