<
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 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.
(1995-04-19)