#Termination ?
3 messages in this thread
Hilary,
It also depends on whether the controller card you are attaching the tape
drive to has an external connector and whether you are going to be using
that connector instead of using the daisy-chained ribbon internal
connector. On some contollers the external chain requires its own
termination and you may need to leave the termination packs on both
devices if you are using the external connector.
Whether you find termination resistors on the drive also depends on what
type of drive it is (SCSI I or SCSI II). On some of the new SCSI II
drives there are no removable termination packs. There is instead a
jumper (usually called TE) which if set turns on the termination and if
removed (again this is usually the case) turns off the termination.
If you need more information, please give us some additional information
so that we can offer better assistance, i.e. model number of drive,
controller card being used, using external connector or internal, etc.
Clark -|-
Williams –O-o-O– Via George
Thanks so much Clark for a most informative reply.
First: The hardware…..
Tape drive: Wangtek Model 5150ES FAO1. Rev 20.
Hard disk: Maxtor Model 7120S. (120 Megs)
Control Card: GVP. "Impact" A2000-HC/XX (A rather "oldie")
Arrangement: Connecting both devices via a flat internal cable from the
control card. Not using external connection.
As far as I am aware both devices are SCSI and not SCSI-2.
QUESTION: Does it matter which device comes first – after leaving the control
card? Say… I hook the hard drive to the first connector – after removing its
termination resistor(s)…. and then the tape backup to the second, with
resistors in place…. OR… Can I hook up the hard drive to the first
connector, with resistors in place, and the connect the tape backup to the
second – with the resistors removed?
Otherwise, does it matter – along the cable – if the terminated unit comes
first or second in line, so long as the other unit is un-terminated?
Thanks again for your encouragement. Regards, HILARY.
From a few messages back, it looks like you got your tape drive working.
But I'm answering your question about SCSI drive order and termination so
you and others will know the right way.
The order of the drives should not matter. Tape first, disk last and disk
first, tape last should not matter if everything is a good SCSI device.
The only time I've heard of unit ordering mattering is if one unit has
unremovable terminators. Then that unit must be the last unit on the SCSI
cable.
Termination placement does matter. The ends of the SCSI cable must be
terminated and no where else. So the terminated unit should be the last
unit and connected at the end of the cable and hopefully the GVP
controller has termination because it is probably on the other end of the
cable.
//
\X/ Amiga or bust! Gary Bonnstetter, Bonnsoft