< hardware > A version of the SCSI command specification.
SCSI-2 shares the original SCSI's asynchronous and synchronous modes and adds a " Fast SCSI " mode ( Wide SCSI " (16 bit, 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-disk s. SCSI-2 addresses that problem. allowing scanner s, hard disk drive s, 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.
(1995-04-19)