Compaq AP550 Compaq Professional Workstation AP550 Maintenance & Service G - Page 51
Installing Optional SCSI Devices, Important Guidelines for Installing Optional SCSI Devices
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3-18 Compaq Professional Workstation AP550 Maintenance and Service Guide Installing Optional SCSI Devices Select models of the Compaq Professional Workstation AP550 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: Table 3-2 Installing Optional SCSI Devices Guidelines A narrow SCSI controller allows you to daisy-chain up to seven additional SCSI devices. A single Ultra SCSI, Ultra-Wide SCSI, or Wide-Ultra SCSI controller allows you to daisy-chain up to 15 additional SCSI devices. The SCSI controller requires a unique SCSI ID (0-7 or 8-15) for each SCSI device installed. The controller identifies a SCSI device by its SCSI ID number rather than its location. SCSI ID 0 is reserved for the primary hard drive. SCSI ID 7 is reserved for the controller. If only one SCSI hard drive is used, install it in the lowest-numbered bay (bay 1). Every SCSI chain or circuit must be terminated (closed) at both ends. Termination can be accomplished in one of several ways: s Use a cable with a built-in terminator. s Use a cable with a terminating resistor plug in the last connector. s Connect a SCSI device with its termination enabled into the last connector. s Connect an external SCSI device with its termination enabled to the external SCSI connector on the rear panel of the computer. Comment Counting the controller, that amounts to eight total SCSI devices Counting the controller, that amounts to 16 total SCSI devices. Moving a SCSI device from one position to another on the SCSI chain does not affect communication between the controller and the device. SCSI IDs 1 through 6 and 8 through 15 are available for all other SCSO devices. Some system boards have both ends of the SCSI cable connected to, and terminated by, the system board. continued