Well I'm pretty sure I've hooked up my Happs rotary joystick properly using the opti-pac and I-pac.
How do I tell MAME to use the rotary input, for TRON for example? I go to TRON's "Input (this game)" menu right? Do I just highlight the input, press enter and then rotate the joystick? Doing so does not register anything in the highlighted field. Does this mean I've got a problem with the wiring?