I too have been wrestling with this problem and have found a solution elsewhere on the web which worked for me. See here
I'm using a Prolific PL2305 USB-Parallel Port connector and a LaserJet 4 printer.
If you do System, Admin, Printing and then install a new printer of your model using one of the serial ports. On completion don't print a test page but go to the properties of the newly installed printer and change the device url to parallel:/dev/usb/lp0. Your printer will hopefully now work!
Trevor
Bookmarks