B Scsi Ids; Scsi Id Default Settings - DEC VAXstation 3100 Owner's Manual

B
SCSI IDs
This appendix contains information common to both the
VAXstation 3100 Model 38 and VAXstation 3100 Model 48
systems. The information is for technical users who wish to create
custom configurations.
SCSI is the acronym for Small Computer System Interface. SCSI
is an interface designed for connecting hard disks and other
peripheral devices to computer systems. SCSI is defined by an
American National Standards Institute (ANSI) standard and is
used by many computer and peripheral vendors throughout the
industry.
Up to eight SCSI devices can share a SCSI bus (a cable). All data
is sent back and forth on the cable. Each SCSI device attached
to the cable looks at all the data, but only takes the data that
has the proper device identification. Each of the eight devices is
identified by a number from 0 to 7, called a SCSI ID.
B.1 SCSI ID Default Settings
You are responsible for the SCSI ID settings on your equipment.
Digital Equipment Corporation sets each SCSI device to a default
SCSI ID before the equipment leaves the factory. You may never
need to change a defsiult setting. Default settings should only be
changed when a S3n3tem is configured with more than one of a
particular device.
The number 7 is used by devices requiring the highest priority on
the SCSI bus. The number 6 is reserved for the controller. The
remaining six ID numbers (0 through 5) are available for custom
configuration.
SCSI IDs B-1