dgsc(7)                          DG/UX 5.4.2                         dgsc(7)


NAME
       dgsc - link an AViiON bus to a SCSI bus

SYNOPSIS
       dgsc ([def]) or
       dgsc @devicecode(adapaddr[,adapid])

DESCRIPTION
       The dgsc adapter allows an AViiON server to access a Small Computer
       System Interface (SCSI) device. The adapter links a host's VME bus to
       a SCSI bus.  The adapter is available with either a single-ended or a
       differential SCSI bus interface.  This adapter supports some SCSI-2
       features, including command queueing/tagging and "fast" SCSI.

       To set up this interface, or access a SCSI device via the interface,
       you use the dgsc adapter ID in a device driver statement: see st(7)
       and sd(7).

       The first format accepts all default values. The second format
       specifies all values:

        def         is a hexadecimal number (range 0-F), selecting a default
                    device code and VME address for the adapter. Null equals
                    0.

        devicecode is the hexadecimal device code of the adapter preceded
                    by the @ character.

        adapaddr   is the adapter's hexidecimal VME address.

        adapid     is the adapter's SCSI ID (range 0-7, recommended 6 or
                    7). Omit to accept the default ID 7.

       A dgsc adapter attempts to use the SCSI synchronous data transfer
       protocol, by negotiating a synchronous offset with each device on the
       the SCSI bus.  If this negotiation fails, the asynchronous mode is
       used.

EXAMPLES
       The following statement in a DG/UX configuration file configures a
       SCSI disk with default values, and creates short and long names for
       the disk in /dev/pdsk and /dev/rpdsk:

            sd(dgsc(0),*)

       The following statement configures a SCSI tape drive, specifying
       device code 30, VME host address FFFFF600, adapter SCSI ID 7, tape
       drive SCSI ID 4, and tape unit number 0:

            st(dgsc@30(FFFFF600,7),4,0)

       The statement creates short and long device names for the tape drive
       in /dev/rmt.




Licensed material--property of copyright holder(s)                         1

dgsc(7)                          DG/UX 5.4.2                         dgsc(7)


       Short device names (0, 1, 2, and so on) are created arbitrarily
       depending on the sequence of configuration statements in the DG/UX
       system file.

SEE ALSO
       sd(7), st(7).



















































Licensed material--property of copyright holder(s)                         2