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Compaq Professional Workstation AP200 Maintenance and Service Guide
Installing Optional SCSI Devices
Select models of the Compaq Professional Workstation AP200 have a preinstalled internal
SCSI hard drive. You can install additional SCSI devices using the external SCSI connector
located on the rear panel of the workstation.
Important Guidelines for Installing Optional SCSI Devices
If you are installing additional SCSI devices, you MUST adhere to the following guidelines:
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To preserve data integrity, do not install more than 7 SCSI devices per SCSI controller.
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The integraded wide-ultra SCSI controller requires that a unique SCSI ID (0-7) be set
for each SCSI device installed. The controller identifies a SCSI device by its SCSI ID
number rather than its location. Moving a SCSI device from one position to another on
the SCSI chain does not affect the communication between the controller and the SCSI
device. The reserced and available SCSI ID numbers for SCSI devices are as follows:
❏
SCSI ID 0 is reserved for the primary hard drive.
❏
SCSI ID 7 is reserved for the controller.
❏
1 through 6 are available.
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Every SCSI chain or circuit must be terminated (closed) at both ends. Termination can
be accomplished by using the terminating feature on the device or by using a terminated
cable.
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SCSI devices may not have terminating jumpers on the device. Termination on these
devices must be achieved with a terminated cable.
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Turn on an external SCSI device before turning on power to the workstation. This
enables the system board controller to recognize the external SCSI device. When an
external SCSI device is connected to the external SCSI controller on the rear panel of
the workstation, that device becomes the end of the SCSI chain and must be terminated.
CAUTION: Do not route cables near the intake to the power supply. Cables routed
in this manner may block airflow to the power supply, causing it to overheat.