if its usb, load ultimate mortal kombat 3, go to the test menu and control diag and get someone to help you, hold a diagnal on both joysticks and hold all buttons... u will see some dont light up in the test. the ps2 is where i had issues with ghosting.. each keyboard i used with it had a different effect, couldnt find a keyboard that worked flawless so i pulled the pcb and put in an ipac... works great