as opposed to standard Amiga joysticks that have their potentiometers wired as potentiometers
The Amiga Joysticks I opened didnt have any Potentiometers, just four switches for up, down, left and right.
So using a PC Joystick on an Amiga (If that is what you want to do) would require a circuit to take an analog value that represent a full turn in one of the directions and switch a certain voltage (5V/TTL probably) when this value is reached.