Small Computer System Interface (SCSI)

SCSI, acronym for small computer system interface, a standard high-speed parallel interface defined by the X3T9.2 committee of the American National Standards Institute (ANSI). A SCSI interface is used for connecting microcomputers to peripheral devices, such as hard disks and printers, and to other computers and local area networks.
Up to seven devices, not including the computer, can be attached through a single SCSI connection (port) through sequential connections called a daisy chain. Each device has an address (priority number). Only one device at a time can transmit through the port; priority is given to the device with the highest address. A SCSI port is standard on the Apple Macintosh Plus, Macintosh SE, Macintosh II, the IBM RS/6000, and the IBM PS/2 model 65 and higher computers. It can be installed in IBM PC and compatible computers as an expansion board.