SCSI(HW)                                   UNIX System V



     Name
          scsi - small computer systems interface


     Description
          SCSI provides a standard interface for peripherals  such  as
          hard  disks,  printers,  tape drives and others. SCSI is run
          via  a  host  adapter  card  that  can  support  up   to   8
          controllers, each supporting up to 8 devices. Note that only
          4 hard disks can be attached to a controller.

          The minor device numbering scheme for SCSI disk  devices  is
          the  same  as  the  standard  minor device number scheme for
          non-SCSI disk devices.  The minor  device  numbering  scheme
          for SCSI tape devices is as follows:

                            SCSI Tape Minor Devices

                         Bits

                7  6  5  4  3  2  1  0   Description
                ________________________________________________

                X  X  -  -  -  -  -  -   Unit (LUN)
                -  -  X  -  -  -  -  -   No unload on close

                -  -  -  X  -  -  -  -   High density (6250 BPI)
                -  -  -  -  X  -  -  -   No rewind on close

                -  -  -  -  -  X  X  X   Unused(reserved)

          Each SCSI controller has its own major device number.


     See Also
          hd(HW), tape(HW)


     Value Added
          scsi is an extension of AT&T System V provided by the  Santa
          Cruz Operation.


     (printed 8/30/89)                                  SCSI(HW)