Apple LaserWriter 12/640 PS - Manual (Page 44)

Connecting directly to a single Mac OS computer
Use this method to connect a single Mac OS computer to the printer.
However, since that single computer takes up the printer’s LocalTalk port,
you cannot also connect the printer to a LocalTalk network.
1 Obtain a System/Peripheral 8 cable.
2 Plug one end of the cable into the computer’s printer ( [ ) port.
3 Plug the other end of the cable into the printer’s LocalTalk ( ˆ ) port.
LocalTalk
port Printer
port
ˆ
19 Setting Up the LaserWriter 12/640 PS