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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.

Base system

What's common to every NeoGeo system: main architecture, data formats...

Last edits
Memory speed01:22, 13 May 2026
Software DIPs21:13, 10 May 2026
System ROM tables15:09, 20 April 2026
42 pages
Video system

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

Last edits
Palette RAM14:47, 17 March 2026
Slowdown09:12, 12 September 2025
Fix bankswitching23:25, 14 May 2025
36 pages
Audio system

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

Last edits
NEO-ZMC09:48, 25 February 2026
Z80 port map05:11, 24 February 2026
Z8021:04, 23 February 2026
28 pages
Repairs

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

Last edits
Memory speed01:22, 13 May 2026
Replacement chip22:21, 25 January 2026
CD drive09:36, 1 November 2025
45 pages
Cart systems

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

Last edits
NEO-FTC1B board13:24, 8 May 2026
Bankswitching02:37, 25 February 2026
M1 ROM20:47, 23 February 2026
106 pages
CD systems

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

Last edits
CD drive09:36, 1 November 2025
CDROM-2 board03:49, 18 August 2025
CD hardware versions03:44, 18 August 2025
48 pages
Software

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 timings18:19, 15 April 2026
68k program header01:38, 8 February 2026
Development tools16:00, 6 October 2025
60 pages
Electronics

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

Last edits
Memory speed01:22, 13 May 2026
NEO-I023:18, 12 May 2026
NEO-FTC1B board13:24, 8 May 2026
109 pages
Games

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

Last edits
Kizuna Encounter - Super Tag Battle10:04, 8 May 2026
Puzzle De Pon! R!00:43, 3 April 2026
The King of Fighters '99 - Millennium Battle17:07, 15 January 2026
241 pages

Recent changes (minor edits hidden)

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13 May 2026

 N    08:13  Talk:NEO-I0‎‎ 2 changes history +323‎ [Ragefan‎; Furrtek‎]
     
08:13 (cur | prev) +61‎ Ragefan talk contribs
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00:08 (cur | prev) +262‎ Furrtek talk contribs (Created page with "User:Ragefan on which board did you find pin 32 tied to GND ? I have RW on my MV1FS, as shown on schematics (https://wiki.neogeodev.org/index.php/File:Mv1fs-page2.jpg). --~~~~")

12 May 2026

     23:18  NEO-I0‎ diffhist +68‎ Ragefan talk contribs (Pin 32 error)

10 May 2026

     15:56 Upload log Furrtek talk contribs uploaded File:Harddips.png ‎

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