Has anyone set their ArcadeSD up for use with a trackball? Looking at the instructions, it says to wire the #2 joystick to the trackball. I'm not sure if I understand correctly because the trackball has two small pcbs with 8 wires total, more than the typical 4 (up/dwn/lt/rt, plus ground) wires. I'm using an Atari Missile Command cocktail control panel with "red board PCB" upgraded stock trackballs.