game i/o - joystick adaptor

[sagochangi@aol.com (Sagochangi)]

i came across a copy of the pinout diagram for the game i/o port on the IIgs
motherboard (IIe, maybe others too), and it looked like the 16-pin socket
actually supports 4 buttons, as well as standard x-y controls.

would anyone have a schematic outlining an adaptor for use with the input
socket, to use, for example, the Gravis PC Gamepad with the II?  are there any
drivers in existance for such a device?

sagochangi