You need to terminate!!!
You also need to provide SCSI terminator power. You only provide SCSI termination power at ether end of the bus. One for the controller (usally on by default) and for the last device.
You can not have more than 3 devices providing SCSI terminator power on one bus.
With a single internal bus you can safely skip the SCSI terminator power stuff since 99% of cards provide SCSI termination power. One FATAIL exception is the PowerBook 520/540 laptops and possibly some of the duo docks. Termination prevents reflection of the signals on the SCSI bus. This refection will cause you all kinds of grief later in life.
DO NOT SKIP THE TERMINATION POWER!
If you system starts doing "weird" stuff like hangs, lockups, crashes, etc, etc, you will never know if the problem is your SCSI bus or not.
I have been working with SCSI from a service standpoint for over 10 years.
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