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==<center>Welcome to the NeoGeo Development Wiki</center>==
<div id="home-header">
 
<div style="min-height:110px;">
<center>This wiki is about every technical aspects of the SNK NeoGeo hardware and software (AES, MVS, CD and CDZ).<br>
  [[File:Neo-Geo-AES-Console-Set.png|left|x100px|link=]]
Our aim is to provide the most detailed, accurate and up to date information for preservation, homebrew development and repairs.<br>
  <h2 class="title">The NeoGeo Development Wiki</h2>
The wiki has {{NUMBEROFARTICLES}} pages. [[Special:Userlist|Contributors list]]. Hosting provided by [[User:ElBarto|ElBarto]].<br>Don't know where to start ? Try [[How_to_start|here]]. Can't find what you're looking for ? Try our [[links]].<BR>  
  <p class="headline">This wiki is about every technical aspects of the SNK NeoGeo hardware and software (AES, MVS, CD and CDZ).<br />Our aim is to provide the most detailed, accurate and up to date information for preservation, homebrew development and repairs.</p>
'''Want to help ? Just [[Join_wiki|register]] ''' or join us on IRC ! [[irc://irc.freenode.net/neogeodev Freenode #neogeodev]]</center>
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==[[Special:RecentChanges|Recent changes]] (minor edits hidden)==
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==Categories==


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    <div class="head cat-base">[[:Category:Base system|<span class="cattitle"><span>Base system</span></span>]]</div>
[[File:Ban_base.jpg|link=:Category:Base system]]<div style="position: relative; left: 20px; top: -42px; height: 0px; font-size: 30px; text-align: left;">[[:Category:Base system|<span class="cattitle">Base system</span>]]</div>
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What's common to every NeoGeo system: main architecture, data formats, ...
        <p>What's common to every NeoGeo system: main architecture, data formats...</p>
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    <div class="head cat-video">[[:Category:Video system|<span class="cattitle"><span>Video system</span></span>]]</div>
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        <p>How graphics are handled and displayed, from bitplanes and colors to the video output.</p>
How graphics are handled and displayed, from bitplanes and colors to the video output.
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    <div class="head cat-audio">[[:Category:Audio system|<span class="cattitle"><span>Audio system</span></span>]]</div>
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[[File:Ban_audio.jpg|link=:Category:Audio system]]<div style="position: relative; left: 20px; top: -42px; height: 0px; font-size: 30px; text-align: left;">[[:Category:Audio system|<span class="cattitle">Audio system</span>]]</div>
        <p>Everything related to music and sound effects: The Z80 subsystem, synthesized and sampled sound, CDDA playback...</p>
Everything related to music and sound effects: The Z80 subsystem, synthesized and sampled sound, CDDA playback...
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    <div class="head cat-repair">[[:Category:Repairs|<span class="cattitle"><span>Repairs</span></span>]]</div>
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[[File:Ban_tools.jpg|link=:Category:Repairs]]<div style="position: relative; left: 20px; top: -42px; height: 0px; font-size: 30px; text-align: left;">[[:Category:Repairs|<span class="cattitle">Repairing</span>]]</div>
        <p>Troubleshooting dead or glitchy MVS boards, CD laser assemblies, cartridges...</p>
Troubleshooting dead or glitchy MVS boards, CD laser assemblies, cartridges...
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    <div class="head cat-cart">[[:Category:Cartridge systems|<span class="cattitle"><span>Cart systems</span></span>]]</div>
 
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        <p>Particularities of the AES and MVS systems: ROM types, memory cards, cab I/O, data security... Also [[:Category:Cartridge boards|cartridge boards]] information.</p>
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[[File:Ban_cart.jpg|link=:Category:Cartridge systems]]<div style="position: relative; left: 20px; top: -42px; height: 0px; font-size: 30px; text-align: left;">[[:Category:Cartridge systems|<span class="cattitle">Cart systems</span>]]</div>
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Particularities of the AES and MVS systems: ROM types, memory cards, cab I/O, data security... Also [[:Category:Cartridge boards|cartridge boards]] information.
        <div>'''Last edits'''</div>
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Pages in category: {{PAGESINCAT:Cartridge systems}}
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    <div class="head cat-cd">[[:Category:CD systems|<span class="cattitle"><span>CD systems</span></span>]]</div>
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[[File:Ban_cd.jpg|link=:Category:CD systems]]<div style="position: relative; left: 20px; top: -42px; height: 0px; font-size: 30px; text-align: left;">[[:Category:CD systems|<span class="cattitle">CD systems</span>]]</div>
        <p>NeoGeo CD and CDZ specificities: Differences and limitations, new memory functions, CDDA...</p>
NeoGeo CD and CDZ specificities: Differences and limitations, new memory functions, CDDA...
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        <p>Code snippets, register definitions, guides on how to display stuff, use the system ROM, play music and sounds, read user input...</p>
Code snippets, register definitions, guides on how to display stuff, use the system ROM, play music and sounds, read user input...
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    <div class="head cat-chips">[[:Category:Chips|<span class="cattitle"><span>Electronics</span></span>]]</div>
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[[File:Ban_chips.jpg|link=:Category:Chips]]<div style="position: relative; left: 20px; top: -42px; height: 0px; font-size: 30px; text-align: left;">[[:Category:Chips|<span class="cattitle">Electronics</span>]]</div>
        <p>What makes everything work (or not). Schematics, chip pinouts and functions, troubleshooting hardware issues...</p>
What makes everything work (or not). Schematics, chip pinouts and functions, troubleshooting hardware issues...
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        <p>Remarquable games for some of their technical aspects: special effects, unusual hardware use, hidden features...</p>
 
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==[[Special:RecentChanges|Recent changes]] (minor edits hidden)==
{{Special:Recentchanges/4,hideminor}}
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  <div class="home-block">
==About this wiki==
    <ul style="list-style:outside none none;">
      <li>The wiki has {{NUMBEROFARTICLES}} pages thanks to our [[Special:Userlist|contributors]]</li>
      <li>Hosting provided by [[User:ElBarto|ElBarto]]</li>
      <li>Don't know where to start ? Try [[How_to_start|here]]</li>
      <li>Can't find what you're looking for ? Try our [[links]]</li>
      <li>'''Want to help ? Just [[Join_wiki|register]] ''' or join us on IRC ! [[irc://irc.libera.chat/neogeodev Libera.chat #neogeodev]]</li>
      <li>'''How to edit, guidelines, available templates, suggestions: [[The wiki]]'''</li>
    </ul>
  </div>


'''How to edit, guidelines, available templates, suggestions: [[The wiki]]'''
  <div class="home-block">


==Todo==
==Todo==
* See [[Special:WantedPages|wanted pages]], [[Special:AncientPages|old pages]], [[Special:ShortPages|short pages]], and [[Todo/Mysteries]].
* See [[Special:WantedPages|wanted pages]], [[Special:AncientPages|old pages]], [[Special:ShortPages|short pages]], and [[Todo/Mysteries]].
* Publish asm highlighter for ConTEXT
* Publish asm highlighter for ConTEXT
Line 152: Line 177:
* Troubleshooting tips
* Troubleshooting tips
* Make a downloadable offline capture every few months ?
* Make a downloadable offline capture every few months ?
  </div>
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__NOTOC__
 
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Latest revision as of 20:15, 20 May 2021

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
BIOS RAM locations21:25, 11 August 2025
Pinouts15:34, 23 July 2025
Memory mapped registers19:21, 10 April 2025
42 pages
Video system

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

Last edits
Slowdown07:12, 12 September 2025
Fix bankswitching21:25, 14 May 2025
Sprites21:18, 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-ZMC15:45, 1 May 2025
ADPCM15:17, 15 March 2025
CDDA03:49, 10 February 2025
28 pages
Repairs

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

Last edits
Replacement chip20:21, 25 January 2026
CD drive07:36, 1 November 2025
List of ROM chips00:03, 26 September 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
Category:Cartridge boards13:23, 10 January 2026
Cartridges18:19, 7 January 2026
PROG board07:40, 7 January 2026
106 pages
CD systems

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

Last edits
CD drive07:36, 1 November 2025
CDROM-2 board01:49, 18 August 2025
CD hardware versions01:44, 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
Development tools14:00, 6 October 2025
PLAYER START subroutine12:00, 6 October 2025
Slowdown07:12, 12 September 2025
60 pages
Electronics

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

Last edits
Replacement chip20:21, 25 January 2026
NEO-SMA15:37, 15 January 2026
NEO-CMC23:04, 10 January 2026
109 pages
Games

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

Last edits
The King of Fighters '99 - Millennium Battle15:07, 15 January 2026
Garou - Mark of the Wolves15:06, 15 January 2026
Metal Slug 315:05, 15 January 2026
241 pages

Recent changes (minor edits hidden)

List of abbreviations:
N
This edit created a new page (also see list of new pages)
m
This is a minor edit
b
This edit was performed by a bot
(±123)
The page size changed by this number of bytes

25 January 2026

     20:21  Replacement chip‎ diffhist +472‎ Furrtek talk contribs (Updated options, reasoning, done/todo)

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 ?


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