128 Appendix F: Interfacing3. By inserting board to the far end, it islocked by the lock piece inside.BoardLock piece4. Connect suitable interface cable (mustbe purchased separately) to printer con-nector and to serial port of your com-puter. Be sure to tighten screws on bothends of cable to keep it in place.Important! Make sure that you do nothave a parallel cable connected to theprinter when you’re using the serial inter-face. You can switch to the parallel inter-face without removing the serial board, butonly one cable can be attached at a time.When the serial interface is installed, the“Serial I/F” portion of the Menu will be-come active (see page 73).