The CH Products Gamecard 3 Automatic Game Card will automatically provide the correct gameport timing for your computer without requiring you to set any switches or adjust any dials. The Gamecard 3 is tested for computers running as fast as 550 MHz and is expected to operate in those running even faster.

It works like this: the Gamecard 3 software determines the speed of the I/O Bus in combination with the CPU speed of your computer and automatically programs the Gamecard 3 to generate the precise timing signals for optimum joystick operation.

Come with printed instruction sheet.  If requested, I can include drivers on 3.5" floppy.  Otherwise, they are available from the internet for download.