NEO-CMC: Difference between revisions

From NeoGeo Development Wiki
Jump to navigation Jump to search
m (1 revision)
(38 intermediate revisions by 3 users not shown)
Line 1: Line 1:
[[File:crt_cmc.jpg|thumb|NEO-CMC chip on a MVS [[cartridges|cartridge]]. Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]]
{{ChipInfo
|picture=crt_cmc.jpg
|pkg=QFP180
|manu=toshiba
|date=1999 ?
|gates=A lot
|used_on={{PCB|CHAFIO}}...
}}


Huge banking (and decrypting ?) chip found on CHA cartridge boards using more than 2 [[C ROM]]s.
[[File:brd_cmcnoref.jpg|thumb|"CMC50"]]


[[File:brd_cmcnoref.jpg|thumb|NEO-CMC chip. Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]]
Late SNK custom chip used for protection, bankswitching and latching on [[CHAFIO]] [[CHA board]]s.


Also found on [[ROM-Only boards|ROM-only]] arcade boards, without the "NEO-CMC" reference (90G06CF7042).
Descrambling/decryption infos can be found in [[https://github.com/mamedev/mame/blob/master/src/devices/bus/neogeo/prot_cmc.cpp  MAME:prot_cmc.c]]


==Versions==
This chip is a TC190G series Toshiba ASIC developed between 1990 and 1994.
The datasheet apparently can't be found anymore for any of the known types:
*TC190G06CF7008
*TC1'''90G06CF7042'''
*TC1'''90G06CF7050'''
(probably others...)
SNK merged the following designs into this chip:
*{{Chipname|NEO-ZMC}}
*{{Chipname|NEO-273}}
*{{Chipname|PRO-CT0}}
*New scrambling system that interlaces M1 + (C* + S1) to decrypt all the graphics ROMs data in real time.
The first released NEO-MVS CHAFIO PCBs came out with the '''042''' version of NEO-CMC, on the following cartridges:
*[[Zupapa!]]
*[[The King of Fighters '99 - Millennium Battle]]
*[[Ganryu]]
*[[Garou - Mark of the Wolves]]
*[[Strikers 1945 Plus]]
*[[Prehistoric Isle 2]]
*[[Metal Slug 3]]
*[[Bang Bead]]
*[[Nightmare in the Dark]]
*[[Sengoku 3]]
On this version only the [[S ROM|S1]] and [[C ROM]]s are encrypted and M1 remains unencrypted. Almost one year later, SNK decided to add one more layer, this time also encrypting M1. This new NEO-CMC chip had the '''050''' reference and was found in the following cartridges:
*[[Jockey Grand Prix]]
*[[The King of Fighters 2000]]
*[[The King of Fighters 2001]]
*[[Metal Slug 4]]
*[[Rage of the Dragons]]
*[[The King of Fighters 2002]]
*[[Matrimelee]]
*[[Pochi and Nyaa]]
*[[Metal Slug 5]]
*[[SNK vs. Capcom - SVC Chaos]]
*[[Samurai Shodown V]]
*[[The King of Fighters 2003]]
*[[Samurai Shodown V Special]]
Until today, nobody has released a cloned chip on the underground market.
==Fix handling==
See [[fix bankswitching]].
==Encryption==
Todo.
=Pinout=
[[File:Neocmc_7050_7042_pinout.png|x600px]]
OpenOffice Draw file: [[File:Neocmc_7050_7042.odg]]
Signals:
*C_e_D[0..15]: C odd data bus
*C_o_D[0..15]: C even data bus
*CX A[0..21]: C1~8 address bus
*Pins 87,88 contains a RC circuit clock driver like in a 8085 with X1 and X2 pinouts
*Pins 89 and 92 are shorted.
[[Category:Chips]]
[[Category:Chips]]

Revision as of 02:22, 3 June 2018

Package QFP180
Manufacturer
First use 1999 ?
Used on CHAFIO...
File:Brd cmcnoref.jpg
"CMC50"

Late SNK custom chip used for protection, bankswitching and latching on CHAFIO CHA boards.

Descrambling/decryption infos can be found in [MAME:prot_cmc.c]

Versions

This chip is a TC190G series Toshiba ASIC developed between 1990 and 1994.

The datasheet apparently can't be found anymore for any of the known types:

  • TC190G06CF7008
  • TC190G06CF7042
  • TC190G06CF7050

(probably others...)

SNK merged the following designs into this chip:

  • NEO-ZMC
  • NEO-273
  • PRO-CT0
  • New scrambling system that interlaces M1 + (C* + S1) to decrypt all the graphics ROMs data in real time.

The first released NEO-MVS CHAFIO PCBs came out with the 042 version of NEO-CMC, on the following cartridges:

On this version only the S1 and C ROMs are encrypted and M1 remains unencrypted. Almost one year later, SNK decided to add one more layer, this time also encrypting M1. This new NEO-CMC chip had the 050 reference and was found in the following cartridges:

Until today, nobody has released a cloned chip on the underground market.

Fix handling

See fix bankswitching.

Encryption

Todo.

Pinout

OpenOffice Draw file: File:Neocmc 7050 7042.odg

Signals:

  • C_e_D[0..15]: C odd data bus
  • C_o_D[0..15]: C even data bus
  • CX A[0..21]: C1~8 address bus
  • Pins 87,88 contains a RC circuit clock driver like in a 8085 with X1 and X2 pinouts
  • Pins 89 and 92 are shorted.
Retrieved from "https://wiki.neogeodev.org/index.php?title=NEO-CMC&oldid=6111"