Main Page
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...
| Memory mapped registers | 19:21, 10 April 2025 |
| Wait cycle | 23:23, 1 October 2024 |
| NGH number | 11:54, 17 June 2024 |
How graphics are handled and displayed, from bitplanes and colors to the video output.
| Fix bankswitching | 21:25, 14 May 2025 |
| Sprites | 21:18, 14 May 2025 |
| Sprite graphics format | 06:24, 10 July 2024 |
Everything related to music and sound effects: The Z80 subsystem, synthesized and sampled sound, CDDA playback...
Troubleshooting dead or glitchy MVS boards, CD laser assemblies, cartridges...
| Graphic glitches | 16:46, 24 February 2025 |
| SLOT6 board | 20:59, 23 June 2024 |
| NEO-273 | 21:17, 15 June 2024 |
Particularities of the AES and MVS systems: ROM types, memory cards, cab I/O, data security... Also cartridge boards information.
| 161-in-1 Series 2 | 09:27, 14 July 2025 |
| 138-in-2 | 09:26, 14 July 2025 |
| Backup RAM | 15:42, 24 May 2025 |
NeoGeo CD and CDZ specificities: Differences and limitations, new memory functions, CDDA...
| OBJ file | 20:58, 17 June 2025 |
| CDROM-2 board | 10:26, 12 April 2025 |
| NEO-CDD board | 19:01, 10 April 2025 |
Code snippets, register definitions, guides on how to display stuff, use the system ROM, play music and sounds, read user input...
| Development tools | 23:13, 17 June 2025 |
| Memory mapped registers | 19:21, 10 April 2025 |
| Vector table swap | 05:39, 3 January 2025 |
What makes everything work (or not). Schematics, chip pinouts and functions, troubleshooting hardware issues...
| NEO-ZMC | 15:45, 1 May 2025 |
| NEO-D0 | 06:11, 18 April 2025 |
| CDROM-2 board | 10:26, 12 April 2025 |
Remarquable games for some of their technical aspects: special effects, unusual hardware use, hidden features...
| 161-in-1 Series 2 | 09:27, 14 July 2025 |
| 2020 Super Baseballs | 09:27, 14 July 2025 |
| 3 Count Bouts | 09:26, 14 July 2025 |
- 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
14 July 2025
| N 09:27 | 161-in-1 Series 2 diffhist +13,837 Neslou talk contribs (Created page with "Relatively recent multicart with a software menu. At least 2 versions of this cart exists. =Version 1= ===Boards=== thumb|55LV100S draft pinout Uses a bunch of uncommon Fujitsu SSOP70 55LV100S 128MB flash chips, which some say were salvaged from other arcade machines. * 3 for P (384MB) * 5 for V (640MB) * 16 for C (2GB) * 1 for S * 1 for M ===PROG board=== *UP1: EPM3256 CPLD for P ROM and mcu control. Full 68k address and...") | ||||
| N 09:27 | 2020 Super Baseballs diffhist +760 Neslou talk contribs (Created page with "{{GameInfo|right |en_title=2020 Super Baseball |jp_title=2020 Super Baseball |jp_title2=2020年スーパーベースボール |developer=SNK / Pallas |ngh_id=030 |megcount=46 |mvs_release=yes |mvs_release_en=y |mvs_release_jp=y |mvs_romset=2020bb |mvs_date=1991 |mvs_pchip= |mvs_pboard=PROG42G-1 |mvs_cboard=CHA42G-1 |aes_release=yes |aes_release_jp=y |aes_release_en=y |aes_date=25/10/91 |cd_release=y |cd_release_jp=y |cd_release_en=y |cd_date=25/2/95 }} ==Strings== <pre...") | ||||
| N 09:26 | 3 Count Bouts diffhist +478 Neslou talk contribs (Created page with "{{GameInfo|right |en_title=3 Count Bout |jp_title=Fire Suplex |jp_title2=ファイヤー・スープレックス |developer=SNK |ngh_id=043 |megcount=106 |mvs_release=yes |mvs_release_en=y |mvs_release_jp=y |mvs_romset=3countb |mvs_date=1993 |mvs_pchip= |mvs_pboard=PROG_4096 |mvs_cboard=CHA_42G-2 |aes_release=y |aes_release_jp=y |aes_release_en=y |aes_romset=3countb |aes_date=23/04/93 |cd_release=y |cd_release_jp=y |cd_release_en=y |cd_date=21/04/95 }} Category:Games") | ||||
| N 09:26 | 138-in-2 diffhist +5,389 Neslou talk contribs (Created page with "It's a multicart ! Binary code to set on the ribbon cable to select which game to start (infos from Fandangos): {| | {|class="wikitable sortable" !Title!!Binary!!Decimal |- |3 Count Bout||00101101||45 |- |Aero Fighters 2||01100011||99 |- |Aero Fighters 3||01100100||100 |- |Alpha Mission 2||10000111||135 |- |Andro Dunos||01100001||97 |- |Art of Fighting 2||00110001||49 |- |Art of Fighting 3||00110010||50 |- |Bang Bead||01111001||121 |- |Baseball Starts 2|...") | ||||
About this wiki
- The wiki has 573 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 ! [Libera.chat #neogeodev]
- How to edit, guidelines, available templates, suggestions: The 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 ?