Using ArcadeSD with Trackball

Samelak

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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.
 
Each pcb on the trackball has 2 sense wires, a +5 and a ground. The sense wires are what would go to the player 2 connections.
 
I bought the "red" optic boards to upgrade the stock 2-1/4 trackball, but have to make custom mounts. Where can I find the pinout for these PCBs? I don't want to fry them.
 
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