I agree with Cammy.
The big left button should be single fire 1, the big right should be single fire 2, the small, triangular-shaped left button should be autofire 1 (fires rapidly as long as you press it) and the small right button autofire 2.
I had a special Competition pro for my Amiga 500 that at least had the small buttons as rapid-fire buttons (left and right were both fire 1 though).
Doesn't matter much though since with e.g. a Playstation-pad and WinUAE you can nowadays map SPACE, ALT, Pause, jump (UP), Escape, Return, F1-F10 and any other key to any button on the controller.
Last edited by john4p; 25 May 2009 at 13:28.