Computer buses and slots connectors pinouts  > obsolete pinouts
The Electrocoin standard was introduced before JAMMA (Japanese Arcade Machine Manufacturers Association) to allow various games to be connected to generic cabinets such as Silverline and Goliaths.

Lower side:

Pin Description
A Ground
B Ground
C +5V
D +5V
E +12V
F -5V
H Not used
J -12V
K Keyway
L Speaker 1
M Speaker 1
N Speaker 2
P Player 2 Up
R Speaker 2
S Player 2 Right
T Player 2 Button 1
U Player 2
V Player 2 Button 2
W Player 2 Left
X (Horizontal Sync)
Y Player 2 Start
Z Video Red
Aa Video Green
Ab Video Blue
Ac Video Sync
Ad Ground
Ae Ground
Af Ground

Upper side:

Pin Description
1 Ground
2 Ground
3 +5V
4 +5V
5 +12V
6 -5V
7 Not used
8 -12V
9 Keyway
10 Meter 1
11 Meter 2
12 Credit Board Meter
13 Player 1 Up
14 Test
15 Player 1 Right
16 Player 2 Button 3
17 Player 1 Down
18 Player 1 Button 3
19 Player 1 Left
20 Service
21 Player 1 Start
22 Player 1 Button 1
23 Player 1 Button 2
24 Coin 1
25 Coin 2
26 Ground
27 Ground
28 Ground
56 pin JAMMA proprietary of Electrocoin connector layout
56 pin JAMMA proprietary connector
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Source(s) of this and additional information: Hardware Book
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