Another major enhancement was the definition of command sets for different device classes. SCSI-1 was rather minimalistic in this respect which led to various incompatibilities especially for devices other than hard-disks. SCSI-2 addresses that problem. allowing scanners, hard disk drives, CD-ROM drives, tapes and many other devices to be connected.
Normal SCSI-2 equipment (not wide or differential) can be connected to a SCSI-1 bus and vice versa.
(01 Mar 1995)
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