A parallel interface is faster than a serial interface because it transfers several bits concurrently. The board plugs in to the SCSI host adapter or SCSI controller of your computer. SCSI is supported by Windows 95 and the Macintosh. For Windows 3.1 or DOS, you need the appropriate SCSI driver. The serial port transmits data one bit at a time.
Most computers have at least one serial port.
Serial ports are most often used for the modem. Older systems sometimes use a serial port for the mouse. The Centronics cable is a standard 36pin parallel interface used for connecting printers and other devices to a computer. Centronics cables come in 36- and 50pin configurations. Extension Extension cables are available if you need to increase the distance between one of your peripheral devices and your computer.