Using Scsi Devices; Setting The Scsi Id - Power Computing PowerTower Pro User Manual

Chapter 2, Connecting Peripheral Devices

Using SCSI devices

Your computer has two separate SCSI busesÑa high-speed 10 MB per second internal
SCSI bus for the built-in devices like the hard disk and the CD-ROM drive and a 5 MB per
second bus primarily for external devices. You can connect up to seven devices in a SCSI
chain to each bus.
External SCSI devices, such as scanners, hard drives, CD-ROM drives, and removable-
cartridge drives can be connected to your computer through the SCSI port on the back of
your computer. Note that there is also an internal SCSI cable connected to this SCSI 5 MB
per second chain in case the main internal SCSI bus is completely Þlled.
Connecting a SCSI device involves four steps:
Setting the deviceÕs SCSI ID number
Ensuring proper termination
Connecting the device
Installing a software device driver (if one is required)

Setting the SCSI ID

Each device in a SCSI chain requires a unique number called a SCSI ID, which the
computer uses to identify the device. The computer itself is assigned SCSI ID 7 and the
internal hard disk is assigned SCSI ID 0. Every other device you install must have a unique
number from 1 to 6.
Drives provided by Power normally come with SCSI ID pre-set as follows:
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PowerTower Pro UserÕs Guide
SCSI ID
0 primary internal hard drive (terminated)
1 optional additional hard drive
3
5 optional removable-cartridge drive
7 motherboard (self-terminated)
Device
CD-ROM drive
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