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Appendix C
Attaching External SCSI Devices
If your Silicon Graphics 320 visual workstation has a SCSI PCI option
card installed, you can attach external SCSI devices to the system.
Here are some tips to keep in mind when attaching SCSI devices:
•
You can mix Ultra and Fast devices on the same bus. You can also
mix 16-bit and 8-bit devices on the same bus. The overall
performance of a mixed bus can vary widely.
•
To daisy-chain a mix of wide and narrow devices, place the wide
devices (as a group) closest to the Silicon Graphics 320
workstation where the bus is wide, and place the narrow devices
(as a group) at the end of the chain.
Note:
Be sure to use an adapter or other special cable that
terminates the upper half of the SCSI bus when
converting from the final wide device to the first
narrow device. Silicon Graphics supplied cables have
this integrated into the cable, but not all third-party
cables have the terminator integrated into the cable.
•
Unsupported devices may not work with the Silicon Graphics
320 workstation and may cause problems with supported
devices.
To attach SCSI devices:
1.
Assign a unique SCSI ID number to each device. Set an ID by
moving the jumpers, switch, or dial on the device to the assigned
number. You can assign any numbers from 0 to 15, excluding
number 7, which is reserved for the SCSI PCI option card.
If you have internal SCSI hard drives installed, the system drive
must be set to SCSI ID 0.
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