Capcom's Play System 2 Decryption Team.
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The CPS-2 Technical Specifications Page.

The main CPS-2 motherboard (known as the 'A board') is distinguished by the color found on the main test and volume buttons. The color codes match those used by the game boards as listed a little later.
 

Main CPS-2 Motherboard with Game Board.

 
The motherboard has several outputs in various locations.
 

Diagram of Main Unit.

 
The CPS-2 Game board (known as the 'B board') comes in five different colors. It was thought that these colors matched up to the language used in game but on getting all the different colored 'A' boards it's clear to see that the color donates the country of release.
 
Green :  Japan
Blue :  U.S.A. and Europe
Orange :  South America
Grey :  Asia
Yellow :  All (Rent version)

Grey and Orange game boards require the main 'A' board of matching color to work. Green and Blue boards are totally interchangeable meaning Green game boards will work on a Blue 'A' board and visa versa. A Yellow case shows a game is the rent version. These were made to fit 'A' boards as required and were used to entice operators to buy the game.
 
Before we start going into any real detail regarding the CPS-2 system here are the general machine specifications.
 
Main Processor :  Custom 68000 at 12 Mhz
Address Bus :  24 bit
Data Bus :  16 bit
Sound Processor :  Zilog Z80 at 8 Mhz
Sound Channels :  16 Stereo Channels
Sound Format :  PCM QSound
Color Palette :  32 bit
Total On Screen Colors:  4096
Colors per tile :  16 (4 bits per pixel)
Object Number :  900 (16 x 16 pixels)
Scroll Faces :  3
Resolution :  384 x 224
Maximum Capacity :  322 Megabits

Ok so far so good. Now that we have seen the outside of the unit and have some basic information, lets open her up and take a closer look the the motherboard itself.
 

Main Motherboard PCB part side.
 
01 :  Test Button 02 :  Volume Up / Down
03 :  Game Board Connectors 04 :  JAMMA Connector
05 :  Extra Button Connector 06 :  Audio Output (RCA)
07 :  68000 Processor 08 :  DRAM Refresh Controller
09 :  S-RAM 10 :  I/O Line Controller
11 :  Z80 Processor 12 :  Qsound Digital Processor
13 :  Graphics Processors

JAMMA (Japanese Arcade Machine Manufacturers Association) is a universal connector used to attach games to arcade cabinets. The extra button connector is needed as the JAMMA connector used with CPS-2 only allows for three buttons per player when most fighting games need six.
 
Here are the pin outs of the JAMMA and Extra Button Connector.

JAMMA connector
 
SOLDER SIDE
  # 
 #  
PART SIDE
GND
A
01
GND
GND
B
02
GND
+5V
C
03
+5V
+5V
D
04
+5V
NC
E
05
NC
+12V
F
06
+12V
H
07
NC
J
08
Coin Counter 1
Coin Lockout
K
09
Coin Lockout
Loudspeaker (-)
L
10
Loudspeaker (+)
NC
M
11
NC
Video Analog Green
N
12
Video Analog Red
Video Composite Sync
P
13
Video Analog Blue
Service Switch
R
14
Video Ground
NC
S
15
Test
Coin B
T
16
Coin A
Player 2 Start
U
17
Player 1 Start
Player 2 Up
V
18
Player 1 Up
Player 2 Down
W
19
Player 1 Down
Player 2 Left
X
20
Player 1 Left
Player 2 Right
Y
21
Player 1 Right
Player 2 Button 1
Z
22
Player 1 Button 1
Player 2 Button 2
a
23
Player 1 Button 2
Player 2 Button 3
b
24
Player 1 Button 3
Player 2 Button 4
c
25
Player 1 Button 4
NC
d
26
NC
GND
e
27
GND
GND
f
28
GND

EXTRA BUTTON Connector
 
BOTTOM
  # 
 #  
TOP
GND
02
01
GND
+5v
04
03
+5v
+12V
06
05
+12V
Configurable
08
07
Configurable
Configurable
10
09
Configurable
Configurable
12
11
Configurable
Configurable
14
13
Configurable
Configurable
16
15
Configurable
Configurable
18
17
Configurable
Configurable
20
19
Configurable
Configurable
22
21
Configurable
Configurable
24
23
Configurable
Configurable
26
25
Configurable
Configurable
28
27
Configurable
Volume Down
30
29
Volume UP
32
31
Common Volume
Common Player 1
34
33
Common Player 2

Pins 07 to 28 can be configurable to anything as games require. This includes coin inputs, coin lockouts, joysticks and buttons.
 
On the JAMMA connector H / 07 is the Key Pin which stops the connector being joined the wrong way around. NC = Not Connected.

Although there is not allot to see on the solder side of the motherboard we have included a picture here so you get an 'all round' feel of how it looks.

 

Main Motherboard PCB solder side.

Well that about covers the main information available on the motherboard at this time. If you would like to take a closer look at the motherboard above, we have full size scans available for download from the following links. These are very large files, so be warned.
 
               Motherboard PCB part side (1,216kb)
 
               Motherboard PCB solder side (1,899kb)

 
The Link Kit
 
There is only one true link kit for the CPS-2 unit and that is for Super Street Fighter 2 : The Tournament Battle. It works by assigning each CPS-2 board an ID number on a network and then enables multi-player games on up to four linked cabinets. Look below for a picture of the connections.
 

Diagram of Network Connections.

 
The adapter is connected to the game PCB and not the motherboard. Here are some pictures of the adapter starting with the part side.
 
Network PCB part side.

 
Network PCB solder side.

If you want to take a closer look at the network PCB you can download scans including a picture of the cable connections below.
 
               Network PCB part and solder side (2,186kb)

 
The Link Cable
 
Several manuals such as Dungeons & Dragons talk of a link cable for use with 2 cabinets. With this cable only one CPS-2 'A' & 'B' board is needed for the process. The cable itself contains about 30 wires and some not so easily found hardware, it's simply a JAMMA harness splitter. It routes video, sound and external wiring to the JAMMA connector on the second cabinet. This Link cable (CAPCOM Part number C-00253) may be obtained through a Coin-OP distributor only but it may be a discontinued part. If you have any info on this part or diagrams on how to build one please let us know.

 
Single Black CPS-2 Unit
 
As said at the beginning not allot is currently know about the unit except the fact it's an 'A' & 'B' board wrapped into one.
 

Picture of Single Black CPS-2 Unit.  
   
Here are a few more pictures of the board including inside.

Main Cover.    Inside.
 
Inside Left.    Inside Right.

Although these pictures arn't great they do tell us some about the system including the following differences over the standard 'A' & 'B' board setup.
  • There is only one PCB and not two sandwiched together.
     
  • The program code is stored on a single simm.
     
  • Graphics and sound data is stored on EPROM's and is in the same format as the standard 'B' board system.
Now for some more pictures, this time more close up splitting the board into four sections with all the main chips pointed out for you.

Black CPS-2 PCB picture 1.
 
Black CPS-2 PCB picture 2.
 
Black CPS-2 PCB picture 3.
 

The last section of this PCB doesn't have any custom chips on it but the picture is included for good measure.

Black CPS-2 PCB picture 4.

Once more is known we will let you know.

 
If you know any CPS-2 technical info that is not on this page please email
us at techinfo@cps2shock.com so we can keep this page accurate.

 

 
Capcom's Play System 2 Decryption Team.
W.I.P. Status CPS-2 Specs CPS Suicide Encryption Game List
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