[Al Skierkiewicz]

cibressus53,
The pinout is the same for any joystick with the gameport connector and you will find that inside wiring varies from one type to another. Some take advantage of an analog input and switch in resistor strings from the five volt power supply. The result is a varying DC potential dependent on which switch is depressed.
The pinout in the OI docs that Rick has linked to has the pinout available for the OI ports starting on page 7. Please note that when working with the OI some switch inputs are shared between ports, i.e. you do not have all of the switches available for each joystick at every port on the OI.
The tough thing for us in the future is that joystick manufacturers are going to USB devices which are not compatible with the OI. Watch for more ideas and innovations as we get into the season.