@tuki_cat IPAC is typically a keyboard interface. Modern versions can be setup using the WinIPAC utility to behave as a joystick controller, but most people use it as a keyboard device. Configured this way, all it is doing is sending keystrokes. Amiberry would have to be capable of receiving inputs via keyboard. If you can plug in a real USB keyboard for all of the inputs (direction and buttons) you should be able to use an IPAC.
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