The pinout isn't right so anything other than the included controllers doesn't work right - the mapping is all screwy. On the Flashback if you hold both fire buttons on controller 1 upon power on, it will go to the diagnostic menu. One of the menus is an input test. Utilizing this it's possible to see just how messed up the mapping is. A standard VCS joystick allows you keypad 7 and keypad 9 (if I'm remembering correctly) as a couple of the joystick directions with everything else non-responsive.