I've got an excellent condition and little used HP LaserJet 6L printer that
only has a parallel cable output-- but my new desktop computer doesn't have
a parallel port-- just USB.

So I got a parallel/Centronics to USB adaptor cable-- but the computer
doesn't recognize it and I can't find a driver that will work. The HP
website is no help.

It's probably not cost effective to set up a wireless or Ethernet print
server. So-- any suggestions? I'd hate to have to go out and buy a new
printer to replace a perfectly good one...

"It's probably not cost effective to set up a wireless or Ethernet print"

Depends--a basic ethernet print adapter is fairly inexpensive. Some have
both USB and parallel ports.

You might also consider adding a parallel port adapter to the desktop. They
are usually very inexpensive.