J.A.M.M.A.
J.A.M.M.A.
What is a JAMMA cabinet anyway?
JAMMA (Japanese Amusement Machine Manufacturers Association)
is a wiring standard which was developed in the 1980's to
standardize wiring of cabinets to game logic boards. A JAMMA
cabinet has a 28+28 way edge connector for connection to a
game board pre-wired to controls, monitor etc.s.
The Japanese Amusement Machine Manufacturers Association set about making a unified board connection standard. This would alleviate the silliness of rewiring a cab for every new game board installed. Now almost every game produced that didn't involve a deluxe cabinet (ie AfterBurner or Virtua Racing) comes with a JAMMA connector. What this means to you is that any JAMMA game can be shoved into a cabinet which previously held any other JAMMA game.
There are only five things to connect to the game board through the wiring harness. The Player 1 and Player 2 controls, the monitor output, power supply input and the coin-door's switches. The diagram below shows the most common connector and how these connections are made to the game board. Many games use a different pinout, and some have differing styles of connection and can also have more than one connector.
J-PAC and jamma loom inside cab A Jamma loom and J-Pac interface
Jamma
plug - Connection diagram
| SOLDER SIDE | # | # | PARTS SIDE |
|---|---|---|---|
|
GND
|
A |
1
|
GND |
|
GND
|
B |
2
|
GND |
|
+5V
|
C |
3
|
+5V |
|
+5V
|
D |
4
|
+5V |
|
-5V
|
E |
5
|
-5V |
|
+12V
|
F |
6
|
+12V |
|
Key, no pin
|
H |
7
|
Key, no pin |
|
Coin counter 2
|
J |
8
|
Coin counter 1 |
|
Coin lockout
|
K |
9
|
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 |
|
Tilt/Slam
|
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 |
|
Player 2 Button 5
|
d |
26
|
Player 1 Button 5 |
|
GND
|
e |
27
|
GND |
|
GND
|
f |
28
|
GND |
Take a look on EBAY and see how many cool jamma cabs are for sale for a MAME project :-)