Apple powermac server g3 minitow Servicehandbuch

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 Basics
Data Buses - 12
 
Narrow SCSI-1 Bus
 
All internal and external devices on the SCSI-1 chain must 
have unique ID numbers. SCSI ID numbers 0 through 6 are 
available. Always terminate the last internal and the last 
external SCSI-1 device, as shown in the following graphic.
 
                Narrow SCSI-1 Bus Termination
Terminate the 
last external 
SCSI device.
Terminate the 
last internal 
SCSI device.
If you connect only internal devices or only external devices, 
the computer will automatically terminate one end of the chain.