Appendix F - Connecting and Configuring Optional
SCSI-2 Devices
Introduction
This appendix contains guidelines for using SCSI-2 (small computer system
interface-2) devices, and explains how to connect external SCSI-2 devices,
install an internal SCSI-2 drive in the Compaq SmartStation, and install
SCSI-2 device drivers.
The expansion base has a built-in SCSI-2 controller, which allows you to
daisy-chain up to seven (one internal) SCSI-2 devices, such as hard drives,
CD-ROM drives, tape drives, WORM (write once read many) drives, DAT
(digital audio tape) drives, scanners, and printers. The expansion base
supports most external SCSI-2 compliant devices.
NOTE: Refer to Section 10.5 for SCSI-2 controller specifications.
The Compaq SCSI-2 Controller is supported under MS-DOS Version 5.0 or
higher and Microsoft Windows Version 3.1 or higher.
NOTE: You cannot boot from a SCSI-2 hard drive in the expansion base.
Selecting the A/B or C/D drive selection switches (Section C.3) on
the rear panel of the expansion base or enabling the A/B or C/D
configuration switches (Section C.2) on the vertical circuit board
have no effect on a SCSI-2 drive.
F.1 SCSI-2 General Guidelines
The following are general guidelines for using SCSI-2 devices:
1. Not all SCSI devices are compatible with the integrated SCSI-2
controller. Ensure that the options you are installing are SCSI-2
compliant.
2. Every SCSI-2 device requires a unique ID number, from 0 to 7. The ID
number uniquely defines each peripheral device and determines the device
priority on the bus. ID number 7 has the highest priority; ID number 0
has the lowest. ID 7 has been assigned to the integrated SCSI-2
controller in the expansion base.
3. Every SCSI chain requires two terminators - one on the first device in
the chain and one on the last device in the chain. Termination is used
to control noise and signal reflection on the lines.
The integrated SCSI-2 controller in the expansion base has an active
terminator that automatically becomes deactivated according to your
configuration. If you use only internal devices or only external
devices, the SCSI-2 controller is automatically terminated. If you mix
internal and external devices, the SCSI-2 controller is not terminated.
Refer to the documentation included with the SCSI-2 device to determine
whether it has an active terminator or a passive terminator that you
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