The LINDA module for the DC-9 Classic is now available for download.
LINDA is an interface that sits between the aircraft and your hardware (joystick or other input device) and makes assigning swiches as simple as possible.
You can read more about and download the DC-9 Classic LINDA module from the LINDA project pages at the Avsim.com forum.
You can read more about the LINDA project at fs-linda.com.