Answer:
The Small Computer Systems Interface (SCSI) is a local I/O bus that is used to connect up to seven peripherals to a host computer. A wide variety of peripherals can be connected including, hard drives, tape drives, CD-ROMs, scanners, etc. The SCSI-1 Hard Drive Interface is a Single ended data bus transmitting data referenced to ground [unbalanced]. SCSI-1 may be call narrow SCSI [or just SCSI] when the 8-bit data path is implemented, or Wide SCSI when operating with a 16-bit data bus. ... A total of 7 devices may be connected on the bus.