SCSI-2

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 (#@10MB/s)

and "Wide SCSI" (16 bit, #@20MB/s or rarely 32 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-disks. SCSI-2

addresses that problem. allowing scanners, hard diskdrives, 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)