The Parallel 1284-B Interface Card installs into the printer's internal port. It supports a parallel 1284-B compliant interface using a 36-pin D-shell female, bi-directional connector. It is recommended that a Lexmark 10' Parallel cable (P/N 1021231) or a bidirectional IEEE 1284 complaint cable be used to avoid compatibility problems. See the Technical Reference for more information about the parallel interface.