Hey,
I just built my first mame machine. I installed my happ 3 inch trackball and plug it in assuming it will start working just like a mouse. nothing works, no mouse movement. I have it plugged into a opti wiz from groovygamegear. I bought the no solder ps/2. I then bought a ps/2 to usb converter and still nothing works. I tried shorting the axis wires without the trackball plugged in and it works. Is my trackball broken? Is there something else i need to do? Please let me know.