Lexmark 4I3 - Manual (Page 160)

Models 4I3 and 5I3 (when parallel or serial is the
active interface)
Supported computers include:
IBM Personal Computer
IBM Personal System/2*
IBM RISC System/6000*
IBM AS/400* with ASCII controller
IBM 4033 LAN Adapter.
Connecting to the Parallel or Serial Interface
Parallel or serial cables are not shipped with your printer. If you do
not have a cable, contact your IBM marketing representative. The
following table provides the information you need to purchase the
correct cable.
Interface Part Name Part Number Cable Length
Parallel Parallel Cable 1525612 1.8 m (6 ft)
Serial
RS-232C Serial Cable 8509386 6 m (20 ft)
Serial
RS-422A Serial Cable 70X8652 15.2 m (50 ft)
Attaching a Parallel Cable
CAUTION:
Make sure the machine is turned Off (O) before you connect
or disconnect the power cord or other cables.
If the machine has cables other than the power cord, you
must connect them before you plug the power cord into an
outlet. You must first unplug the power cord from the outlet
when you remove the other cables.
2-20 User’s Guide