Pinouts of Connectors

Electrocoin connector pinout

layout
schematic diagram
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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.

56 pin JAMMA special connector pin-out & layout
56 pin JAMMA special connector  at the game?
28 pin connector at the arcade game

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

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Pinouts.ru > Pinouts of different motherboard slots >  Pinout of Electrocoin connector and layout of 56 pin JAMMA special connector

Source(s): Electrocoin pinout at Technick.net, from Hardware Book
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