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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
NGH number11:54, 17 June 2024
Z80 port map09:19, 28 January 2024
Z8008:21, 28 January 2024
42 pages

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

Last edits
Sprite graphics format06:24, 10 July 2024
VRAM00:42, 15 March 2024
Eyecatcher20:41, 26 November 2023
36 pages

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

Last edits
Z80 port map09:19, 28 January 2024
NEO-ZMC09:16, 28 January 2024
Z8008:21, 28 January 2024
28 pages

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

Last edits
SLOT6 board20:59, 23 June 2024
NEO-27321:17, 15 June 2024
Repair help18:24, 20 May 2024
45 pages

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

Last edits
SLOT6 board20:59, 23 June 2024
Neo Print19:18, 21 March 2024
P ROM18:27, 11 March 2024
106 pages

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

Last edits
CD drive control06:23, 8 October 2023
Reading CDDA sound levels04:14, 26 September 2023
LC9800014:23, 24 January 2021
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
Development tools19:34, 9 February 2024
Eyecatcher20:41, 26 November 2023
68k interrupts23:50, 16 October 2023
60 pages

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

Last edits
NEO-27321:17, 15 June 2024
NEO-C112:46, 8 May 2024
P ROM18:27, 11 March 2024
109 pages

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

Last edits
Super Bubble Pop03:56, 6 April 2023
Puzzle Bobble01:55, 6 April 2023
Neo 204818:17, 11 March 2023
241 pages

Recent changes (minor edits hidden)

List of abbreviations:
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10 July 2024

     06:24 Upload log Furrtek talk contribs uploaded File:Spritegfx2.png

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 ?