NEO-CMC: Difference between revisions

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[[File:crt_cmc.jpg|thumb|"CMC42" 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}}...
}}


The most "basic" information published can be found at [[http://mamedev.org/source/src/mame/machine/neocrypt.c.html MAME:neocrypt.c]]
[[File:brd_cmcnoref.jpg|thumb|"CMC50"]]
 
The NEO-CMC Chip is a Asic (Application Specific Integrated Circuit).
This device can be programmed only once. Usually it's time consuming to design a custom chip directly. Then, severals trials could be made using FPGA (Field Programmable Gate Array) that can be writen thousands times. The Asic could be considered a final step from this process after many trials been performed.


To get a intuition about costs related, please read this:
Late SNK custom chip used for protection, bankswitching and latching on [[CHAFIO]] [[CHA board]]s.
[[http://www.design-reuse.com/articles/9010/fpga-s-vs-asic-s.html FPGA vs ASICs production and design]]


SNK planned to put protections to avoid Neo-Geo piracy using the NEO-CMC chip on the PCB '''NEO-MVS CHAFIO'''.
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]]


=The Chip=
==Versions==
This chip is a Toshiba Asic TC190G Series developed between 1990 and 1994.
This chip is a TC190G series Toshiba ASIC developed between 1990 and 1994.
(TODO: include Datasheet).
The evolution of this series can be found at [[http://www.toshiba-components.com/ASIC/Technology.html Toshiba Technology RoadMap]].


The series TC190G cannot be found in datasheets anymore, but in past years had these models:
The datasheet apparently can't be found anymore for any of the known types:
*TC190G06CF7008
*TC190G06CF7008
*TC1'''90G06CF7042'''
*TC1'''90G06CF7042'''
*TC1'''90G06CF7050'''
*TC1'''90G06CF7050'''
and others...
(probably others...)


Inside this chip, SNK put the following designs together:
SNK merged the following designs into this chip:
*NEO-ZMC
*{{Chipname|NEO-ZMC}}
*NEO-273
*{{Chipname|NEO-273}}
*New Scrambling system that interlaces M1 + (CX + S1) to decrypt all the Cartridge ROM data in real time.
*{{Chipname|PRO-CT0}}
*New scrambling system that interlaces M1 + (C* + S1) to decrypt all the graphics ROMs data in real time.


The first released PCB with this Asic was '''NEO-CMC42''' on the following cartridges:
The first released NEO-MVS CHAFIO PCBs came out with the '''042''' version of NEO-CMC, on the following cartridges:
{|
*[[Zupapa!]]
|'''CART ID'''
*[[The King of Fighters '99 - Millennium Battle]]
|'''TITLE NAME'''
*[[Ganryu]]
|-
*[[Garou - Mark of the Wolves]]
|070
*[[Strikers 1945 Plus]]
|Zupapa  
*[[Prehistoric Isle 2]]
|-
*[[Metal Slug 3]]
|251
*[[Bang Bead]]
|King Of Fighters 99  
*[[Nightmare in the Dark]]
|-  
*[[Sengoku 3]]
|252
|Ganryu  
|-  
|253
|Garou Mark Of the Wolves  
|-
|254
|Strikers 1945  
|-
|255
|Prehistoric Isle 2  
|-
|256
|Metal Slug 3  
|-
|259
|Bang Bead  
|-
|260
|Nightmare in the Dark  
|-
|261
|Sengoku 3  
|-
|}


On this version only S1 and CRoms were encrypted and M1 remained unencrypted. One year later SNK decided release one more layer on the algorithm, to encrypt M1 also on this mixer chip. Releasing the second model  '''NEO-CMC50''' on the following cartridges:
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]]
|'''CART ID'''
*[[The King of Fighters 2000]]
|'''TITLE NAME'''
*[[The King of Fighters 2001]]
|-
*[[Metal Slug 4]]
|008
*[[Rage of the Dragons]]
|Jockey Grand Prix  
*[[The King of Fighters 2002]]
|-
*[[Matrimelee]]
|257
*[[Pochi and Nyaa]]
|King Of Figthers 2000  
*[[Metal Slug 5]]
|-
*[[SNK vs. Capcom - SVC Chaos]]
|262
*[[Samurai Shodown V]]
|King Of Figthers 2001  
*[[The King of Fighters 2003]]
|-
*[[Samurai Shodown V Special]]
|263
|Metal Slug 4  
|-
|264
|Rage of the Dragons  
|-
|265
|King Of Fighters 2002  
|-
|266
|Power Instinct - Matrimele
|-
|267
|Pochi to Nyaa  
|-
|268
|Metal Slug 5  
|-
|269
|SNK vs Capcom Chaos  
|-
|270
|Samurai Showdown Zero / Samurai Showdown 5
|-
|271
|King of Fighters 2003  
|-
|272
|Samurai Showdown Zero Special / Samurai Showdown 5 Special  
|-
|}


Some peoples talk about Jockey Grand Prix not be a official game, but it´s not all true.
Until today, nobody has released a cloned chip on the underground market.
At least it's production was official, because was used the real encryption on that board.
That encryption cannot be mocked so easily and only the Toshiba and SNK knew the encryption.  


Until today, nobody has released one card using in piracy market using the real chip.
==Fix handling==
That explained why several M1 Rom release over the web wasn't correct until Andreas create a mathematical algorithm that can only half  decrypt M1 not totally. Cause totally must be include more controls and keys that only in possession of the hardware can be figured out.


Explanation Later!
See [[fix bankswitching]].


Neo-CMC only have two series and can only be found in original cartridges encrypted as listed above.
==Encryption==


[[File:brd_cmcnoref.jpg|thumb|"CMC50"]]
Todo.


=Pinout=
=Pinout=
[[File:Neocmc_7050_7042_pinout.png]]
[[File:Neocmc_7050_7042_pinout.png|x600px]]
 
OpenOffice Draw file: [[File:Neocmc_7050_7042.odg]]


Notes:
Signals:
*C_e_D[0-15]: C1/C3/C5/C7 data bus
*C_e_D[0..15]: C odd data bus
*C_o_D[0-15]: C2/C4/C6/C8 data bus
*C_o_D[0..15]: C even data bus
*CX A[0-21]: C1/C2/C3/C4/C5/C6/C7/C8 address 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 87,88 contains a RC circuit clock driver like in a 8085 with X1 and X2 pinouts
*Pins 89 and 92 are short circuited in Cartridge board.
*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.
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