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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
Pinouts15:30, 3 May 2021
Memory mapped registers05:44, 16 February 2021
Software DIPs07:27, 18 January 2021
44 pages

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

Last edits
Eyecatcher14:13, 30 May 2020
CXA114501:13, 24 May 2020
Video DAC23:14, 16 May 2020
36 pages

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

Last edits
Z80 ERROR00:40, 1 June 2021
NEO-ZMC00:43, 11 December 2020
Z80 bankswitching21:37, 10 December 2020
30 pages

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

Last edits
Z80 ERROR00:40, 1 June 2021
MVS MV-6 daughter board connectors pinouts23:03, 5 May 2021
List of ROM chips20:03, 18 March 2021
45 pages

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

Last edits
MVS MV-6 daughter board connectors pinouts23:03, 5 May 2021
PROG board20:48, 18 March 2021
Cartridge ROM arrangements20:40, 18 March 2021
105 pages

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

Last edits
LC9800014:23, 24 January 2021
LC895314:06, 24 January 2021
SYS file11:07, 28 December 2020
48 pages

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

Last edits
HOW TO PLAY04:39, 3 March 2021
MESS OUT02:03, 3 March 2021
Fading colors00:30, 3 March 2021
61 pages

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

Last edits
Pinouts15:30, 3 May 2021
PROG board20:48, 18 March 2021
Cartridge ROM arrangements20:40, 18 March 2021
109 pages

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

Last edits
161-in-1 Series 113:15, 12 September 2020
Metal Slug X - Super Vehicle-00120:17, 9 July 2019
Super Sidekicks16:17, 10 June 2019
239 pages

Recent changes (minor edits hidden)

No changes during the given period match these criteria.

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 ?