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Sorry, it's a pull-up resistor that you want to configure not a pull-down. I was mistaken in my last post. When I originally tried to connect the trackball to the ArcadeSD it seemed like the control lines, i.e. X1,X2,Y1,Y2; never went to an open state. After searching a bit, I got the idea to...

I have an ArcadeSD and two trackballs from Ultimarc in my cocktail. If it's the same as the one pictured here you can get it to work with games if you wire the trackballs with some pull-down resistors. Unfortunately it doesn't work well with ArcadeSD menu. Officially this trackball is not...

It would be nice if someone turned this back to a Tempest cabaret.