John, Thanks for the really quick response. It is an NTR with 36-pin Centronics-type port, a 25-pin serial port (RS-232) and a LocalTalk port (DIN-8, RS-422 compatible). I just copied this stuff from the manual. Remember when all computers etc came with complete manuals? George/Dorothy It depends on which Personal LaserWriter you have there were, by my count, 6 different models, with a variety of connection ports, including SCSI, LocalTalk, Serial and Centronics. Cheers, John