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how do I hook this trackball up to a computer?

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J-Rod:

Yeah Poonga is right, I did most of mine through trial and error, and using a multimeter to figure out what was what. + and - is just a matter of swapping. Make sure you wire up the power and ground directly to the ps2 cable, and not off points on the PCB. I tried that and kept getting +3.3, because of a resistor on the board. My .02

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