AT&T 3B2 Maintenance Reference Manual page 89

SCSI Bus Peripherals
Support Of 384000 SCSI Peripherals
Several of the SCSI peripherals for the 3B4000 computer are supported on a 3B2 computer
differential SCSI bus. The 570 MB disk drive and the Keystone III® differential 9-track tape
drive can be connected to the 3B2 computer HA2 card.
There are some compatibility restrictions with both units depending on their internal firmware
version. However, the 3B2 computer supports 570 MB disk drives with firmware revision 8802
or later. The Keystone III 9-track tape drive currently cannot support data transfers with
synchronous devices such as the DM/300DS. New firmware may have to be installed in the
tape drive to ensure compatibility.
SCSI Software Uti I ities
Each type of SCSI component comes with the appropriate software to support that
component's operation with both UNIX System V and the System Administration menus.
New or changed UNIX System V command manual pages are included in the AT&T 3B2
Computer SCSI Release Notes. New System Administration commands are discussed in the
same document.
Utilities and Dependencies
The use of SCSI on the 3B2 computer requires either UNIX System V Release 2.0.5 (swapping),
or UNIX System V Release 3.0 or later (paging) releases. Also, on a Version 2 model, the
Extended Core Upgrade Utilities must be installed. These utilities provide the functions
necessary to support SCSI self-configuration and other operations.
The SCSI software is comprised of several utilities. Each is used for a particular type of device
or peripheral. The following list describes these utilities and some installation dependencies.
Host Adapter Utilities
Disk Controller Utilities
Provide a communication mechanism between the UNIX
operating system and the SCSI host adapter.
Support the DCM, SCSI XM, ESDI DM, and SCSI DM
external components and the internal disks and disk
controller on Version 3 3B2 models. These utilities provide
the unique functions required by hard disk drives.
Installation requires that the SCSI Host Adapter Utilities be
installed first.
382 Peripheral Overview 3-29