Definitions

Jamma
'Japanese Amusement Machine Manufacturers Association'
A standard pin-out for pcb's. Makes it possible to 'Plug & Play' jamma-compatible games (read pcb's) in a jamma-cabinet. The pinout for the jamma-conector looks like this:
Solder Side
Parts Side
GND
A
1
GND
GND
B
2
GND
+5
C
3
+5
+5
D
4
+5
-5
E
5
-5
+12
F
6
+12
- KEY -
H
7
- KEY -
Coin Counter #2
J
8
Coin Counter #1
Coin Lock Out #2
K
9
Coin Lock Out #1
Speaker (-)
L
10
Speaker (+)
 
M
11
 
Video Green
N
12
Video Red
Video Sync
P
13
Video Blue
Service Switch
R
14
Video GND
Tilt Switch
S
15
Test Switch
Coin Switch # 2
T
16
Coin Switch # 1
2P Start
U
17
1P Start
2P Up
V
18
1P Up
2P Down
W
19
1P Down
2P Left
X
20
1P Left
2P Right
Y
21
1P Right
2P Button 1
Z
22
1P Button 1
2P Button 2
a
23
1P Button 2
2P Button 3
b
24
1P Button 3
 
c
25
 
 
d
26
 
GND
e
27
GND
GND
f
28
GND

Jamma fingerboards
JAMMA fingerboards are edge connectors with the same pin layout as JAMMA arcade boards. The idea being, you take a non-JAMMA arcade board (or in our case PC or video console) and 'convert' it to JAMMA by soldering the correct input/outputs to the JAMMA fingerboard.
It should look something like this:
Jamma Fingerboard
After soldering the various wires to the fingerboard, it looks like this.

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