4016 SX  (250-4901)              Install                Faxback Doc. # 1576

The 25-pin parallel port is located on the back of your computer. See the
Getting Started section to connect a parallel device.

The parallel port on your computer allows either one-way or two-way data
transfer:

* Unidirectional (one-way). The computer uses the port only to send output
  to the parallel device. The computer does not receive input through the
  port.
* Bidirectional (two-way). The computer uses the port both to send output to
  the parallel device and to receive input from the device.

MS-DOS uses unidirectional or bidirectional transfer. OS/2 and SCO XENIX
use unidirectional transfer only.

DIP Switch 5 is designed to let you control the data transfer of the
parallel port. For unidirectional transfer, set Switch 5 to ON (default).
For bidirectional transfer, set Switch 5 to OFF.

Switch 5 should always be set to ON, unless the system is running under
MS-DOS and you want to use the bidirectional mode.