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Writer: M. Church Project: Compaq Professional Workstation AP200 Reference Guide Comments: 352620-003
File Name: E-CH04.DOC Last Saved On: 1/19/99 9:40 AM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Using the Cable-Select Feature with IDE Ultra
ATA Devices
Select models of the Compaq Professional Workstation AP200 have an internal
IDE Ultra ATA hard drive preinstalled. Optional IDE drives are available from
Compaq in kits that include a special drive cable. The configuration of the
drives employs a cable-select feature that identifies the drives as device 0
(primary drive) or device 1 (secondary drive). The system board determines
which drive is device 0 or device 1, based on the way the drives are connected
to the special drive cable. The device 0 drive is the drive connected to the short
segment of the drive cable (or the connector closest to the system board); the
device 1 drive is the drive connected to the long segment of the drive cable.
Drive installation requires no jumper setting changes on the existing or optional
drives. All Compaq drives have the jumpers preset for cable-select installation.
NOTE: If you are installing a second IDE device on the primary controller, you
must use an 80-conductor IDE Ultra ATA cable for optimal performance. This
cable is included with the drive option kit.
IMPORTANT: Compaq does not support mixing IDE Ultra ATA and SCSI
hard drives in the same system. If you are replacing a hard drive in bay 4 or
5, it must be of the same type. If you are replacing the IDE Ultra ATA hard
drive in your workstation with a SCSI hard drive, you will need a SCSI device
option kit and the SCSI controller option kit. The controller option kit contains
the SCSI controller and cable that supports multiple SCSI devices. See the
section “Installing a SCSI Device” in this chapter.