# JAMMA

JAMMA=Japanese Arcade Machine Manufacturers Association

An old group trying to set standards for board pinouts (at arcade machines). This was designed to make board changes easy, just take out the old game and plug in the new. Unfortunately games have evolved, and the Jamma standard is no longer up to the job as it can`t handle more than 4 buttons or two players. Also replacing a board from a different manufacturer meant readjusting the picture on the monitor as it would not be centred in the same position.

28 PIN UNKNOWN CONNECTOR on the arcade machine

## Sold side

Pin | Description
--- | ---
A | Ground
B | Ground
C | +5V
D | +5V
E | -5V
F | +12V
H | Key (no connection)
J | Meter 2
K | Lockout 2
L | Speaker -
M | Audio Ground
N | Video Green
P | Video Sync
R | Service Switch
S | Tilt Switch "Pinball Slam"
T | Coin 2
U | 2 Player start
V | Player 2 Up
W | Player 2 Down
X | Player 2 Left
Y | Player 2 Right
Z | Player 2 Button 1
Aa | Player 2 Button 2
Ab | Player 2 Button 3
Ac | (Player 2 Button 4)
Ad | Not used
Ae | Ground
Af | Ground

## Component side

Pin | Description
--- | ---
1 | Ground
2 | Ground
3 | +5V
4 | +5V
5 | -5V
6 | +12V
7 | Key (no connection)
8 | Meter 1
9 | Lockout 1
10 | Speaker +
11 | Audio +
12 | Video Red
13 | Video Blue
14 | Video Ground
15 | Test Switch
16 | Coin 1
17 | 1 Player start
18 | Player 1 Up
19 | Player 1 Down
20 | Player 1 Left
21 | Player 1 Right
22 | Player 1 Button 1
23 | Player 1 Button 2
24 | Player 1 Button 3
25 | (Player 1 Button 4)
26 | Not used
27 | Ground
28 | Ground

Note: All signals are active low.

Contributor: Joakim Ögren

Source:
JAMMA pinout at Technick.net

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-08