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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
Memory mapped registers04:09, 26 September 2023
68k18:58, 15 July 2023
NGH number13:48, 3 July 2023
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
YM2610 timers00:37, 8 August 2021
YM2610 registers00:34, 8 August 2021
ADPCM00:29, 8 August 2021
30 pages

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

Last edits
SLOT6 board22:49, 2 October 2022
Repair help12:42, 29 May 2022
RAM chip11:38, 27 April 2022
45 pages

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

Last edits
Schematics23:58, 24 September 2023
ROM-Only boards05:03, 6 August 2023
MGD221:34, 15 July 2023
106 pages

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

Last edits
Reading CDDA sound levels04:14, 26 September 2023
LC9800014:23, 24 January 2021
LC895314:06, 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
Fading colors05:02, 26 September 2023
Reading CDDA sound levels04:14, 26 September 2023
Memory mapped registers04:09, 26 September 2023
61 pages

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

Last edits
Schematics23:58, 24 September 2023
NEO-CMC18:35, 28 July 2023
68k18:58, 15 July 2023
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)

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24 September 2023

     23:58  Schematics diffhist +52 NFG talk contribs (→‎AES (home): Added re-draw of page 5 schematic, preserved link to original scan)
     23:49 Upload log NFG talk contribs uploaded File:NeoGeo Z80-RAM-NEO-DO.png(Re-draw of the NEO-D0 (page 5) schematic.)

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 ?