NeoGeo Development Wiki - User contributions [en]

NEO-BUF

2026-06-08T11:48:20Z

Ragefan: Précision on package size

{{ChipInfo
|picture=cd2_buf.jpg
|pkg=QFP48 pitch 0.8mm
|manu=fujitsu
|date=1994 ?
|gates=
|used_on={{PCB|MV1A}} {{PCB|MV1B}} {{PCB|NEO-CDM3-2_board}}
}}

Dual 74HC245 octal transceivers in one chip.
This chip is extensively used in [[CD systems]] to multiplex subsystem and {{Chipname|68k}} accesses to [[DRAM]]s.

Also found on late [[MVS hardware|MVS]] boards.

==Pinout==

{{Pinout|NEO-BUF|512px}}

==Replacement==
[[File:Neo-buf_bypass.jpg|thumb|Picture from MVS-Scans]]
On the {{PCB|MV1A}} and {{PCB|MV1B}}, one NEO-BUF chip is used as a uni-directionnal buffer for the [[68k]] data bus. Some of these faulty chips were replaced by small passive pass-through boards by third parties, which may cause some games to crash:
* MV1B: GA1 on the SLOT1B board
* MV1A: GA11

[[Category:Chips]]
[[Category:Repairs]]

NEO-I0

2026-05-16T23:12:44Z

Ragefan: Message precision

{{ChipInfo
|picture=neo-i0.jpg
|pkg=QFP64R
|manu=fujitsu
|date=1990 ?
|gates=
|used_on={{PCB|MV2B}} {{PCB|MV1-1}} ...
}}

MVS specific chip that does a bunch of unrelated things.

* [[S ROM]] 16bit address latch for the [[SFIX ROM]], same as S ROM portion of {{Chipname|NEO-273}}
* [[SM1]] /CS output when {{Chipname|Z80}} is reading from ROM and onboard ROMs are enabled
* {{Sig|ROMOE|ROMOE}} output for cartridge(s) [[PROG board]]
* Video sync inversion (or not) to [[JAMMA_connector_pinout|JAMMA connector]]
* [[Coin counter]] and [[coin lockout]] outputs

=Pinout=

{{Pinout|NEO-I0|640px}}

*A1~A3,A7: {{Chipname|68k}} address bus
*P0~P15: [[P bus]]
*Q01~Q18: [[SFIX ROM]] address lines
*SM1CS(ORO0): [[SM1]] ROM chip select, made from SYSTEM(ORI0) OR SDROM(ORI1)
*SYNCOUT = SYNCIN XOR SYNCREV (SYNCREV always tied to ground ?)
*Q21, Q22: METER1, METER2
*Q23, Q24: LOCK1, LOCK2
*DS0, DS1: Data select for 2-slot systems made from SLOT0, SLOT1, PORTADRS and ROMOE, goes to a {{Chipname|NEO-G0}}
*COUNTOUT: Address decode from {{Chipname|NEO-F0}}
*Warning On MV1-A, RW is not PIN 32 - Pin 32 is GND

[[Category:Chips]]

Talk:NEO-I0

2026-05-13T06:13:28Z

Ragefan:

[[User:Ragefan|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). --[[User:Furrtek|Furrtek]] ([[User talk:Furrtek|talk]]) 00:08, 13 May 2026 (CEST)

Dear Furrtek, this is a MV1AX. That's very interesting 🤔

NEO-I0

2026-05-12T21:18:14Z

Ragefan: Pin 32 error

{{ChipInfo
|picture=neo-i0.jpg
|pkg=QFP64R
|manu=fujitsu
|date=1990 ?
|gates=
|used_on={{PCB|MV2B}} {{PCB|MV1-1}} ...
}}

MVS specific chip that does a bunch of unrelated things.

* [[S ROM]] 16bit address latch for the [[SFIX ROM]], same as S ROM portion of {{Chipname|NEO-273}}
* [[SM1]] /CS output when {{Chipname|Z80}} is reading from ROM and onboard ROMs are enabled
* {{Sig|ROMOE|ROMOE}} output for cartridge(s) [[PROG board]]
* Video sync inversion (or not) to [[JAMMA_connector_pinout|JAMMA connector]]
* [[Coin counter]] and [[coin lockout]] outputs

=Pinout=

{{Pinout|NEO-I0|640px}}

*A1~A3,A7: {{Chipname|68k}} address bus
*P0~P15: [[P bus]]
*Q01~Q18: [[SFIX ROM]] address lines
*SM1CS(ORO0): [[SM1]] ROM chip select, made from SYSTEM(ORI0) OR SDROM(ORI1)
*SYNCOUT = SYNCIN XOR SYNCREV (SYNCREV always tied to ground ?)
*Q21, Q22: METER1, METER2
*Q23, Q24: LOCK1, LOCK2
*DS0, DS1: Data select for 2-slot systems made from SLOT0, SLOT1, PORTADRS and ROMOE, goes to a {{Chipname|NEO-G0}}
*COUNTOUT: Address decode from {{Chipname|NEO-F0}}
*RW is not PIN 32 ! (Error above in the schematics), Pin 32 is GND

[[Category:Chips]]

Slot check security

2025-10-28T06:36:14Z

Ragefan:

[[File:S3warning.png|frame|Warning screen as shown by [[Sengoku 3]] when booting on MVS hardware with BIOS_MVS_FLAG set to 0 (AES mode).]]

Slot checking is a MVS security measure added in some games produced after 1998 due to the emergence of [[bootleg MVS boards]]. It displays a warning screen and locks the game up if some checks fail.

Someone who would want to bypass this check will typically search for the warning text string in the [[P ROM]] and references to it in the code. Such text can't be found because the checking routine uses a XORed version of the same text instead, certainly to confuse hackers.

=KOF 98=

If the game figures out it is being run for the first time on the system (thanks to [[backup RAM]] data), it forces a [[watchdog]] reset. If the system doesn't reset itself after a certain amount of time (due to the eventual absence of the watchdog circuit), the game displays the warning screen and locks up.

=Other games=

*The calendar data zone in the [[BIOS RAM locations|BIOS RAM]] is cleared, then [[READ_CALENDAR]] is called. If {{BR|BIOS_MONTH}} is greater than 13 (should be 12 ? Is that a bug ?), the check fails. This causes bootleg boards with no [[RTC]] to trigger the security.
*If {{BR|BIOS_MVS_FLAG}} is zero (BIOS in AES mode), and bit 7 of {{Reg|REG_STATUS_B}} is set (MVS hardware), the check fails. This causes bootleg boards using a copy of the AES system ROM or those that don't handle REG_STATUS_B reads to trigger the security.

Depending on the result of those checks, the value $8B55 (pass) or $9DBD (fail) is written to [[VRAM]] at $7FFF. This furthermore verifies that the board has full VRAM.

That VRAM value is then read back and added to $74AB (=$10000 if checks passed) to set the byte at $10FCEF (fail) or not.

A later version of this procedure also times the Z80 reply to command $01. $10FCEE = $FF if Z80 was too slow.

Todo: Add more details.

==Use by games==

As seen in MAME's source ([[https://github.com/mamedev/mame/blob/master/src/mame/drivers/neogeo.cpp neogeo.cpp]]), a few games are known to do this check:

*[[Nightmare in the Dark]]
- Can be disabled with RTS at $19978
*[[The King of Fighters 2000]]
*[[Sengoku 3]]: MVS SLOT CHECK Ver2.30 00/04/25
*[[Matrimelee]]
*[[Metal Slug 2]]
*[[Metal Slug 5]]

[[Sengoku 3]]: Checks M1 ROM too, displays "M1-ROM ERROR." if Z80 doesn't reply to command 1 in $7FFF iterations loop.

[[Category:Games]]

NEO-ZMC

2025-05-01T15:45:21Z

Ragefan: Error in date, found an older chip

{{ChipInfo
|picture=crt_zmc.jpg
|pkg=SOIC24
|manu=fujitsu
|date=1991 ?
|gates=
|used_on=[[cartridges]]
}}

{{Chipname|Z80}} '''M'''emory '''C'''ontroller. Handles the [[Z80]] bankswitching in cartridges. To save pins, the Z80's upper address line are also used as data input. The chip's write strobe SDRD0 is [[Z80 port map|port]] address decoded inside the system.

=Pinout=

{{Pinout|NEO-ZMC|512}}

Pins 10, 11, 12 may be M1 higher address bits ?

* SDA0, SDA1, SDA8~15: Z80 address bus
* M1 A11~M1 A18: [[M1 ROM]] address lines
* SDRD0: Decoded write signal from {{Chipname|NEO-D0}} (latch on rising edge)

=Operation=

SDA8~SDA15 are used for the bank number (data), SDA0 and SDA1 for selecting the window.

{|class="wikitable"
!SDA1
!SDA0
!Z80 port
!Window
!Address range
!Size
!Latch size
|-
|0||0||$08||0||$F000~$F7FF||2KiB||8 bits
|-
|0||1||$09||1||$E000~$EFFF||4KiB||7 bits
|-
|1||0||$0A||2||$C000~$DFFF||8KiB||6 bits
|-
|1||1||$0B||3||$8000~$BFFF||16KiB||5 bits
|}

==Details==
[[File:Neo-zmz_operation.png|thumb]]

SDRD0 must be high before configuring banks.

To configure a bank to be accessed (e.g. bank 1 in the $8000~$BFFF range):
* Set SDRD0 low (prepare for new bank configuration, outputs are tri-stated)
* Set SDA0~15 = '''$8103''', select 16KiB bank 1 in window 3 (Why $8103 and not just $0103 ?)
* Set SDRD0 high (latch bank, ready to convert inputs to proper output signals)
* Now, when the Z80 reads the '''$8000~BFFF''' range, NEO-ZMC will map this to the M1 ROM zone '''$04000~$07FFF'''

[[Category:Audio system]]
[[Category:Chips]]

Cartridge ROM arrangements

2025-02-23T15:32:03Z

Ragefan:

Sizes are in KBytes.

==Stats==
*Most used PROG board: PROGBK1
*Least used PROG boards: NPS-PRG1, PROGV
*Most used CHA board: CHA256
*Least used CHA board: CHA64-C

{|class="wikitable sortable"
![[NGH number|NGH]]!!Title!!Release!!P size!!C size!!V size!!S size!!M size!![[PROG board|PROG PCB]]!![[CHA board|CHA PCB]]
|-
|001||Nam 1975||1990/04/26||512k||6*512k||4*512k||None ?||None ?||PROG-NAM||CHA-32
|-
|002||Baseball Stars Professional||1990/04/26||512k||6*512k||5*512k||None ?||None ?||PROG-EP||CHA-32
|-
|003||Top Player's Golf||1990/05/23||512k*2||8*512k||5*512k||None ?||64k||PROG-EP||CHA-32
|-
|004||Mahjong Kyoretsuden||1990/04/26||512k||4*512k||5*512k||64k||64k||PROG-EP||CHA-32
|-
|005||Magician Lord||1990/04/26||512k*2||6*512k||3*512k||None ?||None ?||PROG-EP||CHA-32
|-
|006||Riding Hero||1990/07/24||512k*2||4*512k||6*512k||None ?||None ?||PROG-HERO||CHA-32
|-
|007||Alpha Mission 2||1991||512k||2*1024 +2*512||2*1024||None ?||None ?||PROG42G||CHA42G
|-
|008||Jockey Grand Prix||2001||?||?||?||?||?||PROGV||[[CHA_board#CHAFIO|CHAFIO]]
|-
|009||Ninja Combat||1990/07/24||2*512k||6*512k||4*512k||None ?||None ?||PROG-EP||CHA-32
|-
|010||Cyber-Lip||1990/11/07||512k||6*512k||5*512k||None ?||64k||PROG-EP||CHA-32
|-
|011||Super Spy, The||1990/10/08||512k||4*1024k||2*512k +1024||None ?||None ?||PROG-8MB||CHA-8M
|-
|014||Mutation Nation||??/??/????||512k||4*1024k||2*1024k||None ?||None ?||PROG42G-1||CHA42G-1
|-
|016||King of the Monsters||1991||512k*2||4*1024k||2*1024k||None ?||None ?||PROG42G PROG42G-1||CHA42G CHA42G-1
|-
|017||Sengoku||1991/02/12||2*512k||4*1024k||2*1024k||None ?||None ?||PROG42G||CHA42G
|-
|018||Burning Fight||1991||2*512k||4*1024k||2*1024k||None ?||None ?||PROG42G||CHA42G
|-
|019||[[League Bowling]]||1990/12/10||512k||2*512k||3*512k||None ?||None ?||PROG-HERO||CHA-32
|-
|020||Ghost Pilots||1991/01/25||512k||4*1024k||2*512 +1024||None ?||None ?||PROG8M42||CHA-8M
|-
|021||[[Puzzled]] (Joy Joy Kid)||1990/11/20||512k||2*512k||2*512k||None ?||None ?||PROG-EP||CHA-32
|-
|022||Blue's Journey||1990||1024k||2*1024 +2*512||2*1024||None ?||None ?||PROG8M42||CHA-8M
|-
|023||Quiz Daisousa Sen||??/??/????||1024k||2*1024k||1024k||None ?||None ?||PROG42G||CHA42G
|-
|024||Last Resort||1992||512k||2*1024 +2*512k||2*1024k||None ?||None ?||PROG42G-1||CHA42G-1
|-
|025||Eight Man||1991||512k||2*1024 +2*512||2*1024k||None ?||None ?||PROG42G-1||CHA42G-1
|-
|027||Mahjong Minnasano Okagesamadesu||??/??/????||?||?||?||?||?||PROG-8MB||CHA-8M
|-
|029||Legend of Success Joe||??/??/????||?||?||?||?||?||PROG42G-1||CHA42G-1
|-
|030||2020 Super Baseball||1991||512||4*1024||2*1024||128||128||PROG42G-1||CHA42G-1
|-
|031||Soccer Brawl||1992||512||2*1024 +2*512||2*1024||128||128||PROG42G-1||CHA42G-1
|-
|032||Robo Army||??/??/????||512||2*1024 +2*512||2*1024||128||128||PROG42G-1||CHA42G-1
|-
|033||Fatal Fury||1991||512 +128||4*1024||2*1024||128||128||PROG42G-1||CHA42G-1
|-
|034||Football Frenzy||1992||512||2*1024 +2*512||2*1024||128||128||PROG42G-1||CHA42G-1
|-
|036||Mahjong Bakatonosama Manyuki||??/??/????||?||?||?||?||?||PROG42G-COM||CHA42G-1
|-
|037||Crossed Swords||1991||512||4*1024||1024||128||128||PROG42G-1||CHA42G-1
|-
|038||Thrash Rally||1991||2*512||2*1024 +2*512||1024 +512||128||128||PROG42G-COM||CHA42G-1
|-
|039||King of the Monsters 2||1992||2*512||2*2048 +2*512||2048 +1024||128||128||PROG16 PROG42G-1||CHA42G-1
|-
|040||Sengoku 2||1993||1024||2*2048 +2*512||2048 +1024||128||128||PROG4096||CHA42G-2
|-
|041||Baseball Stars 2||1992||512||4*1024||2*1024 +512||128||128||PROG42G-1||CHA42G-1
|-
|042||Quiz Meitantei Neo & Geo||??/??/????||?||?||?||?||?||PROG42G-1||CHA42G-1
|-
|043||3 Count Bout (Fire Suplex)||1993||2*512||4*2048||2*2048||128||128||PROG4096||CHA42G-2
|-
|044||Art of Fighting||1992||512||4*2048||2*2048||128||128||PROG4096 PROG16||CHA42G-1
|-
|045||Samurai Shodown||??/??/????||1024||4*2048 +2*1024||2*2048||128||128||PROGGSC||CHA42G-3
|-
|046||Top Hunter||1994||2*1024||8*1024||4*1024||128||128||PROGTOP||[[CHA_board#CHA256B|CHA256B]]
|-
|047||Fatal Fury Special||1992||1024 +512||6*2048||2*2048 +1024||128||128||PROGGSC||CHA42G-3 CHA42G-3B
|-
|048||Quest of Jong Master||??/??/????||?||?||?||?||?||PROGGSC||CHA256
|-
|049||Andro Dunos||1992||2*512||2*1024||2*512||128||128||PROG16||CHA42G-1
|-
|050||Ninja Commando||??/??/????||?||?||?||?||?||PROG42G-1||CHA42G-1
|-
|051||[[Viewpoint]]||1992||?||?||?||?||?||PROG-G2||CHA42G-1
|-
|052||Super Sidekicks||1992||?||?||?||?||?||PROG-G2||CHA42G-2
|-
|053||World Heroes||1992||?||?||?||?||?||PROG16||CHA42G-1
|-
|055||King of Fighters '94||1994||2048||8*2048||3*2048||128||128||PROGTOP||CHA256
|-
|056||Art of Fighting 2||1994||1024||8*1024||2*2048 +1024||128||128||PROGGSC||CHA256
|-
|057||[[World Heroes 2]]||1993||2048||6*2048||2*2048||128||128||PROG4096B||CHA42G-3B
|-
|058||Fatal Fury 2||1993||1024||4*2048||2*2048||128||128||PROG-G2||CHA42G-1
|-
|059||Savage Reign||??/??/????||2048||8*2048||3*2048||128||128||PROG4096B PROGTOP||CHA42G-3 CHA256
|-
|060||Fight Fever||1994||1024||4*2048||2048 +1024||128||128||PROGGSC||[[CHA_board#CHA256B|CHA256B]]
|-
|061||Super Sidekicks 2||1994||1024||4*2048||2*2048||128||128||PROGTOP PROGGSC||CHA256
|-
|062||Spin Master (Miracle Adventure)||1993||2*1024||8*1024||1024||128||128||PROGGSC||CHA256
|-
|063||Samurai Shodown II||??/??/????||2048||8*2048||3*2048 +1024||128||128||PROGTOP||CHA256
|-
|064||World Heroes 2 Jet||1994||2048||8*2048||2*2048||128||128||PROGGSC||CHA256
|-
|065||Windjammers (Flying Power Disk)||1994||1024||4*1024||4*1024||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA42G-1
|-
|066||Karnov's Revenge (Fighers History Dynamite)||1994||1024||6*2048||2048||128||128||PROGGSC||CHA256
|-
|067||Gururin||1994||512||2*2048||512||128||128||PROG16||CHA256
|-
|068||Power Spikes II||??/??/????||1024||6*1024||3*1024||128||128||PROGTOP||CHA256
|-
|069||Fatal Fury 3||1995||512 +128||4*1024||2*1024||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|070||Zupapa!||2001||1024||2*8192||2048||?||128||PROGBK1||[[CHA_board#CHAFIO|CHAFIO]]
|-
|073||Panic Bomber||??/??/????||2*1024||512||2048 +1024||128||128||PROGTOP||CHA256
|-
|074||Aggressors of Dark Kombat||1994||2048||8*2048||2*2048||128||128||PROGTOP||[[CHA_board#CHA256B|CHA256B]]
|-
|075||Aero Fighters 2 (Sonic Wings 2)||1994||2048||4*2048||2048 +512||128||128||PROGGSC||CHA256
|-
|076||Zed Blade||1994?||512||4*2048||2*2048 +1024||128||128||PROGGSC||CHA256
|-
|078||Galaxy Fight||1995||2048||6*2048 +2*1024||2*2048 +1024||128||128||PROGTOP||CHA256
|-
|079||Street Hoop (Dunk Dream)||1994||1024||4*2048||2048 +1024||128||128||PROGGSC||CHA256
|-
|080||Quiz King of Fighters||??/??/????||?||?||?||?||?||PROGGSC||CHA256
|-
|081||Super Sidekicks 3||1995||2048||6*2048||3*2048||128||128||PROGTOP PROG4096B [[PROG_board#PROGBK1|PROGBK1]]||CHA256 [[CHA_board#CHA256B|CHA256B]] CHA42G-3
|-
|082||Double Dragon||1995||2048||6*2048 +2*1024||2*2048||128||128||PROGTOP||CHA256
|-
|083||Bust-A-Move (Puzzle Bobble)||1994||512||4*1024 +2*512||3*1024 +512||128||128||PROGTOP||CHA256
|-
|084||King of Fighters '95||1995||2048||4*4096 +2*2048 +2*1024||4096 +2048 +1024||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|086||Tecmo World Soccer '96||1996||1024||2*4096 +2*1024||2*2048||128||128||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|087||Samurai Shodown III||??/??/????||4*512 +1024||6*4096 +2*1024||4096 +2048||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|088||Stakes Winner||1995||2048||4*2048||2048||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA42G-3B
|-
|089||Pulstar||??/??/????||1024 +2048||6*4096 +2*2048||2*4096||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|090||World Heroes Perfect||1995||2048||2*4096 +6*2048||3*2048||128||128||PROGTOP PROGGSC [[PROG_board#PROGBK1|PROGBK1]]||CHA256 [[CHA_board#CHA256B|CHA256B]]
|-
|092||Kabuki Klash||1995||2048||4*4096||3*2048 +1024||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|093||Neo Bomberman||??/??/????||1024||2*4096 +2*512||4096 +2048||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|094||Voltage Fighter Gowcaizer||1995||2048||8*2048||2*2048 +1024||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA42G-3B
|-
|095||Real Bout Fatal Fury||??/??/????||1024 +2048||6*4096 +2*2048||3*4096||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|096||Art of Fighting 3||1996||1024 +2048||6*4096 +2*2048||3*2048||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|097||Aero Fighters 3 (Sonic Wings 3)||1995||2048||2*4096 +2*2048||4096 +2048||128||128||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|200||[[Neo Turf Masters]] (Big Tournament Golf)||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|201||[[Metal Slug]]||1996||2048k||4*4096k||2*4096k||128k||128k||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|202||Puzzle de Pon!||??/??/????||?||?||?||?||?||PROG4096||CHA42G-2
|-
|203||Master of Syougi||??/??/????||?||?||?||?||?||PROGTOP||CHA42G-3B
|-
|206||Quiz Chibi Marukochan Deluxe||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|207||Neo Mr. Do!||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA42G-3B
|-
|208||Super Dodge Ball||1996||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|209||Goal! Goal! Goal!||1995||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|212||Over Top||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|213||Neo Drift Out||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|214||King of Fighters '96||1996||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|215||Super Sidekicks 4||1996||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|216||Kizuna Encounter||1996||?||?||?||?||?||PROGTOP||CHA256
|-
|217||Ninja Master's||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|218||Ragnagard||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|219||Pleasure Goal||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|221||Magical Drop 2||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256 [[CHA_board#CHA256B|CHA256B]]
|-
|222||Samurai Shodown IV||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|223||Real Bout Fatal Fury Special||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|224||[[Twinkle Star Sprites]]||1996||2048k||2*4096k +2*1024k||4096k +2048k||128k||128k||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|225||Waku Waku 7||1996||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|227||Stakes Winner 2||1996||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|230||Breakers||1996||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|231||Money Puzzle Exchanger||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA42G-3B
|-
|232||King of Fighters '97||1997||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|233||Magical Drop 3||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|234||Last Blade||1997||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|235||Puzzle de Pon! R||??/??/????||?||?||?||?||?||PROG4096||CHA42G-2
|-
|236||Iritating Maze, The||1997||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|237||Pop 'n Bounce||??/??/????||?||?||?||?||?||PROG4096||CHA42G-3B
|-
|238||Shock Troopers||1997||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHA256B|CHA256B]]
|-
|239||Blazing Star||1998||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|240||Real Bout Fatal Fury 2||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|241||[[Metal Slug 2]]||1998||1024k +2048k||4*8192k||2*4096k||128k||128k||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|242||King of Fighters '98||1998||?||?||?||?||?||PROGSF1 [[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|243||Last Blade 2||1998||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|244||NeoGeo Cup '98||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|245||Breakers Revenge||1998||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|246||Shock Troopers 2nd Squad||1998||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA512Y
|-
|247||Flip Shot||1998||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|248||Bust-A-Move Again (Puzzle Bobble 2)||1999||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|249||Captain Tomaday||1999||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|-
|250||[[Metal Slug X]]||1999||1024k +4096k||6*8192k||2*4096k +2048k||128k||128k||PROGEOP||CHA512Y
|-
|251||King of Fighters '99||1999||?||?||?||?||?||PROGLBA [[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHAFIO|CHAFIO]]
|-
|252||Ganryu||1999||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHAFIO|CHAFIO]]
|-
|253||Garou: Mark of the Wolves||1999||?||?||?||?||?||PROGLBA||[[CHA_board#CHAFIO|CHAFIO]]
|-
|254||Strikers 1945 Plus||1999||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHAFIO|CHAFIO]]
|-
|255||Prehistoric Isle 2||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHAFIO|CHAFIO]]
|-
|256||[[Metal Slug 3]]||2000||2*4096k||8*8192k||4*4096k||none||512k||PROGLBA||[[CHA_board#CHAFIO|CHAFIO]]
|-
|257||King of Fighters 2000||2000||?||?||?||?||?||PROGLBA([[NGPC flash board]])||[[CHA_board#CHAFIO|CHAFIO]]
|-
|259||Bang Bead||2000||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHAFIO|CHAFIO]]
|-
|260||Nightmare in the Dark||??/??/????||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHAFIO|CHAFIO]]
|-
|261||Sengoku 3||2001||?||?||?||?||?||[[PROG_board#PROGBK1|PROGBK1]]||[[CHA_board#CHAFIO|CHAFIO]]
|-
|262||King of Fighters 2001||2001||?||?||?||?||?||PROGBK2||[[CHA_board#CHAFIO|CHAFIO]]
|-
|263||[[Metal Slug 4]]||2002||1024k +4096k||6*8192k||2*8192k||none||128k||PROGBK2||[[CHA_board#CHAFIO|CHAFIO]]
|-
|264||Rage of the Dragons||??/??/????||?||?||?||?||?||PROGBK2||[[CHA_board#CHAFIO|CHAFIO]]
|-
|265||King of Fighters 2002||2002||?||?||?||?||?||PROGBK2||[[CHA_board#CHAFIO|CHAFIO]]
|-
|266||Matrimelee||??/??/????||?||?||?||?||?||PROGBK2||[[CHA_board#CHAFIO|CHAFIO]]
|-
|267||Pochi & Nyaa||??/??/????||?||?||?||?||?||PROGBK2||[[CHA_board#CHAFIO|CHAFIO]]
|-
|268||[[Metal Slug 5]]||2003||2*4096k||8*8192k||2*8192k||none||512k||PROGBK3S||[[CHA_board#CHAFIO|CHAFIO]]
|-
|269||SVC Chaos||2003||?||?||?||?||?||PROGBK3R||[[CHA_board#CHAFIO|CHAFIO]]
|-
|270||Samurai Shodown V||??/??/????||?||?||?||?||?||PROGBK2R||[[CHA_board#CHAFIO|CHAFIO]]
|-
|271||King of Fighters 2003||2003||?||?||?||?||?||PROGBK3S||[[CHA_board#CHAFIO|CHAFIO]]
|-
|272||Samurai Shodown V Special||??/??/????||?||?||?||?||?||PROGBK2S||[[CHA_board#CHAFIO|CHAFIO]]
|-
|?||??/??/????||?||?||?||?||?||NPS||Neo Print|-PRG1||CHA64-C
|-
|?||??/??/????||?||?||?||?||?||Neo Print KOF'97||[[PROG_board#PROGBK1|PROGBK1]]||CHA256
|}

==Replacement chips==

[[File:Cartridge_chips.png]]

[[Category:Cartridge systems]]
[[Category:Chips]]

Cartridge ROM arrangements

2025-02-23T15:31:13Z

Ragefan:

File:Cartridge chips.png

2025-02-23T15:29:07Z

Ragefan:

SLOT6 board

2024-06-23T20:59:55Z

Ragefan:

[[File:Slot6_anot.jpg|400px|right]]
[[File:Slot6_details.jpg]]

[[File:74151.png]]

=C ROM data=

CR0~CR31 are multiplexed by 32 74LS251 8-to-1 data selectors. See [[Graphic glitches]].

*K28: CR0
*K29: CR1
*K30: CR2
*J28: CR3
*J29: CR4
*J30: CR5
*H28: CR6
*H29: CR7
*H30: CR8
*G28: CR9
*G29: CR10
*G30: CR11
*F28: CR12
*F29: CR13
*F30: CR14
*E28: CR15
*E29: CR16
*E30: CR17
*D28: CR18
*D29: CR19
*K3: CR20
*K2: CR21
*J3: CR22
*J2: CR23
*H3: CR24
*H2: CR25
*G3: CR26
*G2: CR27
*G1: CR82
*F3: CR29
*F2: CR30
*F1: CR31

=S ROM data=

FIXD0~FIXD7 are multiplexed by 8 74LS251 8-to-1 data selectors. See [[Graphic glitches]].

*E3: FIXD0
*E2: FIXD1
*D3: FIXD2
*D2: FIXD3
*D1: FIXD4
*C3: FIXD5
*C2: FIXD6
*C1: FIXD7

=Blocks=

==Chip 1, 2 & 3: 74F244 [[68k]] address lines==
[[File:Slot6_chip1.png]]
[[File:Slot6_chip2.png]]

[[File:Slot6_chip3.png]]

==Chip 4: 74LS244 68k ROMs control lines==
[[File:Slot6_chip4.png]]

==Chip 5 & 6: 74LS245 68k data lines==
[[File:Slot6_chip5.png]]
[[File:Slot6_chip6.png]]

==Chip 7 & 8: 74LS244 P odd lines and clocks==
[[File:Slot6_chip7.png]]
[[File:Slot6_chip8.png]]

==Chip 9 & 10: 74LS245 P even lines, C/S address, P clocks==
[[File:Slot6_chip9.png]]
[[File:Slot6_chip10.png]]

==Chip 11 & 13: 74LS245 PCM-A ROM multiplexed bus 0~23==
[[File:Slot6_chip11.png]]
[[File:Slot6_chip13.png]]

Note: it looks like SDRADx and sSDRADx are swapped on chip 11 schematic compared to real board.

==Chip 12 & 14: 74LS245 PCM-B ROM multiplexed bus 0~11==
[[File:Slot6_chip12.png]]
[[File:Slot6_chip14.png]]

Note: it looks like SDRADx and sSDRADx are swapped on chip 12 schematic compared to real board.

==Chip 15: 74LS245 [[Z80]] D0~D7==
[[File:Slot6_chip15.png]]

==Chip 16: 74LS244 Z80 [[M1 ROM]] control lines==
[[File:Slot6_chip16.png]]

==Chip 17 & 18: 74LS244 Z80 address lines==
[[File:Slot6_chip17.png]]
[[File:Slot6_chip18.png]]
[[Category:Repairs]]
[[Category:Cartridge systems]]

Repair help

2024-05-20T18:24:07Z

Ragefan:

=Damaged chips=

==Smoke and other visible clues==

[[File:Friedchip.jpg|thumb|If a chip looks like the moon's surface, it can only be bad news. Here [[NEO-GRC2-F]] on a [[MV1B]], which fried under 12V.]]

Visual inspection can reveal physically damaged chips. Burnt, deformed or cracked chips are definitely dead.

On NeoGeo systems, burnt chips are often a sign that the 5V rail went way higher than 5V, probably because of a cab or [[supergun]] power supply failure, 12V short, or a reverse connection of the [[JAMMA_connector_pinout|JAMMA connector]]. Several chips are usually killed in that case, but all may not show visible damage.

Some chips may have survived on the board. '''May have'''.

==Internal damage==

Internal chip damage is more common, and can't be detected visually. Voltage spikes or shorts may cause microscopic, irreversible damage, resulting in floating or "stuck" pins.

That's why some pins of multi-purpose SNK chips like [[NEO-I0]] may still function, but others may be dead. Some custom chips can be saved if they're mostly functioning: the dead pins can be cut off and replaced with discrete logic chips with a bit of courage.

[[RAM_chip|RAM]] having unexplainable behavior are certainly internally damaged and need to be replaced. Multiple RAM chips may have been killed by a "long" voltage spike. RAM chips also tend to die one after the other on cabs which have their PSU's voltage set too high or drifting up with time.

=MVS=

==Backup/Work/Video RAM error==
Typical message looks like: ''Backup RAM error: Address 00D00000; Written 5555; Read 0000.''

The last part is the most useful: ''Written XXXX Read YYZZ'' 
The YYZZ represent upper and lower bytes - each one handled by a different SRAM IC: YY is upper RAM, ZZ is lower RAM.

The value can help you to know which line/trace causes a problem. 
For example, writing AAAA and reading AAA2 means the 4th data line of lower RAM causes a problem. 
[[File:Calc-hexa.jpg|200px|]]

==Video RAM error==
*Address between $0000 and $7FFF: Check [[CXK58257]] 32k [[VRAM]] chips next to [[GPU]]s (see [[RAM_chip]]).
*Address between $8000 and $86FF: Check [[CXK5814]] 2k VRAM chips (see [[RAM_chip]]).
*High byte read is different: check the RAM chip with the highest number.
*Low byte read is different: check the RAM chip with the lowest number.
*Read byte stuck to $FF (bad /OE ?), only a few bits different (traces cut ?), random address (floating /OE, /CE ?)

==No [[fix layer]]==
*Signal 1MB doesn't reach [[NEO-B1]].
*Signal PCK2B doesn't reach the cartridge slot.

==No sound==
*Backup RAM corrupt, '''SOUND_STOP''' ($D00046) is non-zero. Clear [[backup RAM]].
*[[YM2610]] has no clock, bad control signals (/CS mainly), or dead.
*[[YM3016]] has cut traces to YM2610, or dead.
*Low sound level: broken sliders/pots, bad caps.
*[[Power amp]] is fried.
*Unplugged or faulty [[NEO-CDD boards|NEO-CDD board]].
*Dead op-amps.

==Z80 error==
Can be caused by bad components / continuity with the following:
*Z80 <-> SM1
*Z80 <-> RAM
*Z80 <-> NEO-B0 (Z80 SD0-SD7)
*Z80 <-> NEO-257 (Z80 SD0-SD7) / if output of mux of a multi slot is shorted

Second generation specific (todo: get pin numbers in a nice table)
*Z80 <-> NEO-D0 (NMI,A2-A4,IORQ) 1st generation is also concerned.
*Z80 <-> NEO-C1 (Z80 SD0-SD7)
*NEO-D0 <-> NEO-C1 (Z80R,Z80W,Z80CLR,SDW)

==Cross-Hatch on Mv4 (Battery Damage)==
Here :
https://github.com/jwestfall69/neogeo-diag-bios/blob/master/docs/repairs/mv4_067063.md

[[Category:Repairs]]

NEO-C1

2024-05-08T12:46:08Z

Ragefan:

{{ChipInfo
|picture=aes_c1.jpg
|pkg=QFP100R
|manu=fujitsu
|date=1992 ?
|gates=
|used_on={{PCB|NEO-AES3-4 board|NEO-AES3-4}}...
}}

Multi-purpose keystone chip used for address decoding, inter-CPU communications, [[wait cycle]] generation, and [[joypad|player input]]s.

Maps itself to even byte access only (only D15~8 connected).

=Pinout=

{{Pinout|NEO-C1|900}}

=Signals=

==Inputs==

{{Reg|REG_P1CNT}}:
* IN00: Up P1
* IN01: Down P1
* IN02: Left P1
* IN03: Right P1
* IN04: A P1
* IN05: B P1
* IN06: C P1
* IN07: D P1

{{Reg|REG_P2CNT}}:
* IN10: Up P2
* IN11: Down P2
* IN12: Left P2
* IN13: Right P2
* IN14: A P2
* IN15: B P2
* IN16: C P2
* IN17: D P2

{{Reg|REG_STATUS_B}}:
* IN20: Start P1
* IN21: Select P1
* IN22: Start P2
* IN23: Select P2
* IN24: Memory card inserted
* IN25: Memory card inserted
* IN26: Memory card write protect
* IN27: System type (home/arcade)

==68k==

*A17~A21: [[68k]] address bus
*A22I~A23I: [[NEO-E0]] address input
*D8~D15: 68k data bus
*R/W,UDS,LDS,AS,DTACK: 68k bus control signals
*68KCLK: 12MHz 68k clock
*ROMWAIT,PWAIT0,PWAIT1,PDTACK: signals from cart PROG board to configure how /DTACK is generated for ROMOE region (how is it configured?)

==Decoded signals==

The following output and write enables have an upper(U)/lower(L) byte enable signal based on /UDS and /LDS from the 68k.

*ROMOEU,ROMOEL: $000000-$0FFFFF read, 68k program ROM on cart PROG board
*WRU,WRL,WWU,WWL: $100000-$1FFFFF read/write, [[68k user RAM]]
*PORTOEU,PORTOEL,PORTWEU,PORTWEL: $200000-$2FFFFF read/write, multipurpose signal on cart PROG board
*SROMOEU,SROMOEL: $C00000-$CFFFFF read, BIOS
*SRAMOEU,SRAMOEL,SRAMWEU,SRAMWEL: $D00000-$DFFFFF read/write, [[battery-backed RAM]]

On NEO-C1, when A23I A22I A21 A20 = 1100 and RW = 1, either SROMOEU and SROMOEL should be low depending on UDS and LDS

The following are expected to be word accessed, byte writes and reads are ignored or do not work as expected.

*CRDO,CRDW: $800000-$BFFFFF read/write, [[memory card]]
*CRDC: Memory card select (CRDO AND CRDW ?)
*LSPOE,LSPWE: $3C0000-$3DFFFF read/write, [[LSPC2-A2]]
*PAL: $400000-$7FFFFF access, enables transcievers attached to [[palette RAM]] for 68k access

==Z80 I/O==

*SDD0~SDD7: [[Z80]] data bus used for [[68k/Z80 communication]]
*SDZ80R,SDZ80W: read / write signals for Z80 communication
*SDW: signals that 68k has written a byte to Z80 port, will make [[NEO-D0]] generate interrupt if enabled
*SDZ80CLR: initialise stored byte to zero?

[[Category:Chips]]

NEO-GRC2

2024-02-03T22:51:57Z

Ragefan:

{{ChipInfo
|picture=Neo-grc2-f.jpg
|pkg=QFP208
|manu=fujitsu
|date=1995 ?
|gates=
|used_on={{PCB|MV1B}}
}}

Second version of the all-in-one [[VDC]].

Has embedded fast [[VRAM]], which means that [[VIDEO RAM ERROR]]s at or above $8000 on boards using this chip are bad news.

Also has embedded [[palette RAM]], so [[COLOR RAM ERROR]]s are equally bad news.

Slow VRAM is still external.

On Mv1b, pin 204 is 68clk

=Pinout=

[[File:Neo-grc2_pinout.png|800px]]

[[File:Neo-grc2.odg]]

[[Category:Chips]]