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Personal computers have various types of ports.
Internally, there are several ports for connecting disk drives , display screens , and keyboards . Externally, personal computers have ports for connecting modems , printers , mice , and other peripheral devices . On PCs , the parallel port is a Centronics interface that uses a 25- pin connector . All Apple Macintosh computers since the Macintosh Plus have a SCSI port. The port number identifies what type of port it is.