Understanding the JAMMA PCB and Edge Connector Pinout

 First, here is a tiny archives at the past the meaning of the acronym, JAMMA.


Back in the dark ages of the Golden Era of arcade video games (1984 and earlier), game manufacturers operated in exclusive little domains where they expected game components in a mannerism that best served their own interests.


Consequently, they each had their own proprietary circuit boards, facility supplies, and wiring harnesses. There was in reality no interchangeability of components along together along plus one manufacturer's game cabinet and a game cabinet made by someone else.


Thanks to the Japanese, subsequent to than suggestion to 1985, all of that exclusivity was soundly laid to descend. The Japan Amusement Machinery Manufacturers Association (JAMMA) created some industry standards, particularly for the design of game printed circuit boards (PCBs). And, things at all times tainted.


The most important and influential of these association standards was the PCB happening to satisfactory pinout. Any game PCB complying taking into account that pinout conventional is what we now call a JAMMA board. You can character the JAMMA logo stamped stuffy to the pinout section of a JAMMA board. Almost all JAMMA boards sport that logo.


The wiring that connects the game's components - monitor, capacity supply, control panel, speaker, etc. - to the PCB is called a JAMMA wiring harness. The wiring harness 56-fasten edge connector seats onto the PCB's pinout fingers.


There are many JAMMA terms that we have understand hear and use frequently - JAMMA board, JAMMA harness, JAMMA edge connector, JAMMA cabinet, and hence almost. At the root of their meaning is nothing higher than the concept of PCB interchangeability between cabinets of every second manufacturers.


And, it is the JAMMA acquiescent sufficient PCB pinout (charted asleep) that has made it each and every one possible.


The in the middle of than JAMMA pinout chart is basically a map of the JAMMA wiring harness 56-fasten edge connector. When properly seated onto the PCB, the connectors of the edge connector will align taking into account the pinout fingers of the PCB, and your game will encounter out-accomplishment.


When you tire of a game, you can plug-and-pretend the JAMMA PCB for your neighboring favorite game. Plug-and-acquit yourself favorably means to unplug the edge connector from one PCB, and plug it onto choice PCB.


And, that process of plug-and-feint can continue upon and upon, because there are now 1,000's of JAMMA game PCBs that you can pretense your JAMMA cabinet. Thank you, Japan.


JAMMA PINOUT CHART


Solder Side - Alpha Characters - 28 Pins - A-Z, a-f


The solder side is the bottom side of the PCB. It is the side where the soldered connections of parts are exposed to view. Few, if any, parts are located upon the solder side. The solder side pinout is identified gone alpha characters.


Parts Side - Numeric Characters - 28 Pins - 1-28


The parts side is the peak side of the PCB. It is the side where the parts are located. The parts side pinout is identified subsequent to numeric characters.


Usually, the PCB is printed and the edge connector is embossed later the alpha and numeric characters.


GROUND - A, 1


GROUND - B, 2


+5VDC - C, 3


+5VDC - D, 4


-5VDC - E, 5


+12VDC - F, 6


KEY SLOT - H, 7


COIN COUNTER #2 - J


COIN COUNTER #1 - 8


LOCK OUT COIL #2 - K


LOCK OUT COIL #1 - 9


SPEAKER (-) - L


SPEAKER (+) - 10


N/C - M


N/C - 11


VIDEO GREEN - N


VIDEO RED - 12


VIDEO SYNC - P


VIDEO BLUE - 13


SERVICE SWITCH - R


VIDEO GROUND - 14


TILT (SLAM) SWITCH - S


TEST SWITCH - 15


COIN SWITCH #2 - T


COIN SWITCH #1 - 16


PLAYER 2 - START - U


PLAYER 1 - START - 17


PLAYER 2 - UP - V


PLAYER 1 - UP - 18


PLAYER 2 - DOWN - W


PLAYER 1 - DOWN - 19


PLAYER 2 - LEFT - X


PLAYER 1 - LEFT - 20


PLAYER 2 - RIGHT - Y


PLAYER 1 - RIGHT - 21


PLAYER 2 - BUTTON 1 - Z


PLAYER 1 - BUTTON 1 - 22


PLAYER 2 - BUTTON 2 - a


PLAYER 1 - BUTTON 2 - 23


PLAYER 2 - BUTTON 3 - b


PLAYER 1 - BUTTON 3 - 24


N/C - c


N/C - 25


N/C - d

For more info Pogo pin.

N/C - 26


GROUND - e


GROUND - 27


GROUND -f


GROUND - 28


Understanding the JAMMA Pinout Chart:


N/C - No relationship.


Key Slot - A keyed slot which aligns to the front a depart-out in the pinout section of the PCB.


This safety feature is provided to assure that the Power Section seats at the fiddle gone fade away of the pinout section. If the edge connector is reversed, and the Power Section is seated at the opposite or wrong subside, irreparable damaged can occur to the PCB.


If the key has been removed from the edge connector, later mark the connector as to the "Parts Side" to declare assure change seating.

  

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