Standard I/O ports

Most system unit models have two integrated (standard) EIA 232 asynchronous serial ports.

The model M20/M2A features a single integrated asynchronous serial port that can be converted to support two serial devices using an optional fanout cable. EIA 232 asynchronous serial devices can be attached directly to the standard serial ports using standard serial cables with 9-pin or 25-pin D-shell connectors.

Note: For the Itanium-based platform, EIA 232 asynchronous serial devices can be attached directly to the standard serial ports using standard serial cables with 9-pin D-shell connectors.

The machines capable of multiprocessing have three serial ports.