User:Rom1

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.

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List of abbreviations:

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17 November 2024

04:10

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15 November 2024

13:04

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Base system

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

Last edits

Wait cycle	23:23, 1 October 2024
NGH number	11:54, 17 June 2024
Z80 port map	09:19, 28 January 2024

42 pages

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Videosystem

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

Last edits

Sprite graphics format	06:24, 10 July 2024
VRAM	00:42, 15 March 2024
Eyecatcher	20:41, 26 November 2023

36 pages

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Audio system

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

Last edits

Z80 port map	09:19, 28 January 2024
NEO-ZMC	09:16, 28 January 2024
Z80	08:21, 28 January 2024

28 pages

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Repairs

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

Last edits

SLOT6 board	20:59, 23 June 2024
NEO-273	21:17, 15 June 2024
Repair help	18:24, 20 May 2024

45 pages

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Cart systems

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

Last edits

SLOT6 board	20:59, 23 June 2024
Neo Print	19:18, 21 March 2024
P ROM	18:27, 11 March 2024

106 pages

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CD systems

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

Last edits

Loading files	04:10, 17 November 2024
Logo file	13:04, 15 November 2024
CD drive control	06:23, 8 October 2023

48 pages

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Software

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

Last edits

Loading files	04:10, 17 November 2024
Development tools	19:34, 9 February 2024
Eyecatcher	20:41, 26 November 2023

60 pages

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Electronics

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

Last edits

NEO-273	21:17, 15 June 2024
NEO-C1	12:46, 8 May 2024
P ROM	18:27, 11 March 2024

109 pages

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Games

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

Last edits

Super Bubble Pop	03:56, 6 April 2023
Puzzle Bobble	01:55, 6 April 2023
Neo 2048	18:17, 11 March 2023

241 pages

About this wiki

• The wiki has 569 pages thanks to our contributors
• Hosting provided by ElBarto
• Don't know where to start ? Try here
• Can't find what you're looking for ? Try our links
• Want to help ? Just register or join us on IRC ! [Freenode #neogeodev]

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 ?