Apple Duo 270C manual Setting Scsi ID numbers, Make sure the Scsi device is turned off

Setting SCSI ID numbers

Each device in a SCSI chain must have a unique ID number between 1 and 6 so the computer can identify it properly. The information in this section can help you assign SCSI ID numbers to the devices you want to use with your computer.

sWarning: Using two or more devices with the same SCSI ID number can cause your equipment to malfunction. You could lose information as a result. s

The hard disk inside your PowerBook Duo has the SCSI ID number 0. If there is a hard disk in your Duo Dock, it has the SCSI ID number 1. You can’t change this number, and you can’t assign the ID number 1 to any other device you connect. (If there is no hard disk in your Duo Dock, this restriction doesn’t apply.)

See the documentation that came with your SCSI devices for information about ID numbers and how to change them.

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).

ID number indicator

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ID number switch

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.

Remember that the number 1 is unavailable if your Duo Dock has a built-in hard disk.

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.

Chapter 13: Building a PowerBook Duo System 257