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. They use the same 28 way connector,
but the designations are different. Pins 16 and 18 were 3 player and 4 player
start buttons, and were superseded when 3 button games became popular. Pins 14
and 20 were free, but were used by us to allow for easy servicing of games.
Pinout
28 PIN UNKNOWN CONNECTOR on the arcade machine
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
|
Contributions
Sources