Probably your port. Although what behavior do you see?

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I can get the cursor on the screen to move in all directions but the left, and moving the mouse to the left succeeds only in moving the cursor to the right.

And if your joystick doesn't work (how would you know if you have no way to test it?) then it's the port for certain.

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Loaded a couple of games with joystick option, and could not get the cursor on the screen to move more than just a little.