Star Micronics LC-1021 User Manual page 25

Plug one end of the parallel cable into the parallel port of your computer.
The parallel port should be labeled "Printer," "Parallel," "PRN," "LPT1," or
something similar.
Plug the other end of the parallel cable into the socket on the side of the
printer and secure it in place with the clips.
Note:
Consult your dealer for details on how to set up your computer when using the
optional SPC-8K serial-to-parallel interface converter or the IS-8H192 serial
interface unit.
Connecting to your computer 19