SCSI-2
SCSI-2
(hardware)SCSI-2 shares the original SCSI's asynchronous andsynchronous modes and adds a "Fast SCSI" mode (<10MB/s)and "Wide SCSI" (16 bit, <20MB/s or rarely 32 bit).
Another major enhancement was the definition of command setsfor different device classes. SCSI-1 was rather minimalisticin this respect which led to various incompatibilitiesespecially for devices other than hard-disks. SCSI-2addresses that problem. allowing scanners, hard disk drives, CD-ROM drives, tapes and many other devices to beconnected.
Normal SCSI-2 equipment (not wide or differential) can beconnected to a SCSI-1 bus and vice versa.