Path: utzoo!attcan!uunet!cs.dal.ca!dal1!ireland
From: ireland@ac.dal.ca
Newsgroups: comp.sys.mac.hardware
Subject: How many terminators with 2 SCSI drives?
Keywords: SCSI terminators
Message-ID: <1654@ac.dal.ca>
Date: 26 May 90 02:58:36 GMT
Lines: 25
Organisation: Dalhousie University, Halifax, Nova Scotia, Canada

I posted a message a few days ago explaining a problem I was having daisy-
chaining two external SCSI drives to my MacPlus.  One of the drives is a
Jasmine 70 (Rodime mechanism), the other is a LaCie Cirrus 45 (Seagate
mechanism).  Both drives work fine individually, but I couldn't boot the
Mac when they were both connected at the same time.  I kept getting a 
SadMac icon.  Changing the SCSI number assignments had no effect.
I want to thank all the people that responded to my question and offered
suggestions, but I'm confused by some of these suggestions and would like
more information.
One person said that Rodime's are non-standard SCSI devices and have problems
working with other drives sometimes.
Another person said I might have to use the startup cdev to set the drive
that I wanted to be the startup drive.  I have daisy chained drives before
without using the startup cdev and am not sure what is for.
A third person said there could be a problem if both drives had system/finders
installed.  I don't believe this is a problem.
All the rest (six) said I had a termination problem, and that only the last
drive in the daisy chain was supposed to be terminated.  Is this right?
In my Jasmine Owner's Guide, it says that both ends of the chain are to be
terminated, so one doesn't start removing terminators until the third SCSI
device is added.  What's the scoop on terminators?  One at the end or one at
each end?

Thanks,  Keith Conover
Keith@ac.dal.ca