Here is the underside of the control panel I wired up. Instead of an I-PAC, this time I used a KeyWiz device from GroovyGameGear. (http://www.groovygamegear.com/Page5.html) In fact, all of my control panel parts came from Groovy Game Gear this time, and I'm very happy with them -- especially the easy 4-way to 8-way lever-changing joystick. It is FAR easier to use.