How To Connect a Jamma Harness

You have built the ultimate arcade cabinet, bought a bunch of electronic hardware, and now all you need to do is wire it.Here are some helpful tips.

Step 1: The first thing you need is a harness.

There are two rows of 28 pins used on most arcade machines.

Step 2: There is a standard wiring code for the JAMMA harness.

Step 3: Push the connector onto the board.

The board is usually keyed at the place where pin 7 is, so that they only go on one way.It is possible to put the connectors on the wrong side of the road.

Step 4: The wires for the power supply will have different terminals to the wires in the controls, so it's a good idea to locate them.

The power supply cables will go to the left of the keyslot.

Step 5: The board should be pressed firmly onto the connector.

If it is a loose fit a blob of hot melt glue will be needed to hold it in place, do not use chewing gum even if it seems to work at first, it will attract all manner of crawlies that will set up home inside your cabinet and cause trouble down the line.

Step 6: Pick up the wires into groups.

Player 1 controls and player 2 controls.Use elastic bands to temporarily bundle these.You can sort out which wire needs to go where once bundled.Use a lot of cable ties to keep it tidy.

Step 7: If your board has a built in test mode, it is a good idea to switch it on before connecting up the controls.

If you can test that you have the right wire going to the correct control, you won't have to worry about making mistakes later.If you have the power supply connected and isolated, you can only work with wires carrying a tiny current.

Step 8: Enjoy playing your favourite games once connected.