Apple Macintosh PowerBook 145 - Manual (Page 235)

The ID numbers of Apple SCSI devices can be set as follows.
1. Make sure the SCSI device is turned off.
If the device is already part of a SCSI chain, make sure that all
devices in the chain are turned off, including the computer.
2. Locate the ID number indicator and switch (usually on
the back panel of the SCSI device).
3. Check the ID numbers of all the devices you want to
connect.
If all the devices have unique ID numbers, you’ve finished this
part of the procedure. Continue with the next section,
“Checking That the SCSI Chain Is Properly Terminated.”
4. If you need to change a device’s ID number, choose an
available number between 1 and 6.
5. Insert the end of a straightened paper clip into the
small hole below the ID number indicator.
The small hole gives you access to the ID number switch.
6. Push the ID number switch repeatedly until the
number you want appears in the ID number indicator.
ID number switch
ID number indicator
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Chapter 13: Expanding Your Computer System 219