Compaq Deskpro 6000 Compaq Reference Guide Deskpro 4000 and Deskpro 6000 Serie - Page 142
Using the Cable-Select Feature with Ultra ATA Devices, Installing SCSI Devices
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Using the Cable-Select Feature with Ultra ATA Devices Optional 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 that connector closest to the system board); the device 1 drive is the drive connected to the long segment of the drive cable. The device 0 and device 1 identities are used by the system to distinguish between the two drives. The installation requires no jumper setting changes on the existing or optional drives. All Compaq drives have the jumpers preset for cable-select installation. If installing a second device on the primary controller, you must use an 80-conductor Ultra ATA cable for optimal performance. This cable is available as a Compaq option. Installing SCSI Devices The Compaq Deskpro 6000 Series of Personal Computers features an embedded Ultra-SCSI host adapter that supports up to seven internal and external SCSI devices. Deskpro 6000 models come with an internal SCSI hard drive preinstalled. Additional high-performance SCSI devices can be added to all Deskpro 6000 models. Guidelines for Installing Optional SCSI Devices When installing additional SCSI devices, you must adhere to the following guidelines: s A SCSI host adapter supports up to 7 SCSI devices. s Every SCSI device must have a unique identification (ID) number (0 - 7). The SCSI host adapter identifies signals to and from 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 reserved and available SCSI ID numbers for SCSI devices are as follows: 7-22 Upgrading the Minitower Computer