Aug 182016

A friend of mine asked me if I could have a look at an Outrun to Jamma loom that was made by another collector, as it was thought to be incomplete and missing the steering pot connections.

It was fairly easy to understand as far as I could tell. The Outrun 20 pin connector had three groups of wires in three sets. So you had 3 wires on A1-A3, B1-B3, and B4-B6.

A1-A3 controlled the accelerator. This was configured to go to a veroboard with some resistors so it could use a microswitch to control the speed. The wires that came off this board went to P1 button 3 and ground on the Jamma adapter

B4-B6 controlled the brake. This again went into a veroboard of resistors, and then two wires going to ground and P1 button 1 on the Jamma side.

B1-B3 controlled the wheel. This went to ground and P1 Button 4. The wire at B1 was not connected to anything and had shrink wrap on it

I also had a quick look at where P1 button 2 went to, to complete all P1 buttons. This went to A4 on the 50 pin Outrun connector and that deals with the shift. I assumed it simply swaps between low and high.

So with regards the missing steering pot the previous owner must have had a wheel control panel in his Jamma cab with a pot connected to B4, and ground on his Jamma edge connector. I would assume the third pin on the pot would have been connected to 5v, but again that would be taken care of inside his Jamma cab.

Now that I had an understanding of how things had been put together I suggested to my friend that if this was to be used on a test bench, it would be better to have some kind of joystick connected. I was essentially going to leave the original wiring intact, but break into the wiring with a Mate N’ Lok type connector. The connector could then be swapped between the orginal wiring, as it was, or a connector that had a joystick with potentiometers.

I managed to find an appropriate joystick to do this and began modifying it to work with the loom. After quite a bit of wiring, soldering, track cutting, and crimping, I finally had a joystick that worked with an original Sega Outrun PCB.