RetroArcade.us 3in Arcade Trackball with Interface Harness for Jamma 60-in-1 Multigame PCB - (Translucent White Ball)The RetroArcade.us trackball with the JAMMA 60-in-1 PCB interface harness easily connects directly into your JAMMA 60-in-1 PCB. The Arcade Quality 3 inch diameter white trackball will be automatically configured as soon as it is phys..