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From: kinsell@hpfcdj.HP.COM (Dave Kinsell)
Newsgroups: comp.sys.apollo
Subject: Re: HP 9000 series 400 disks
Message-ID: <17220001@hpfcdj.HP.COM>
Date: 27 Nov 90 01:23:39 GMT
References: <9011152114.AA03708@richter.mit.edu>
Organization: Hewlett Packard -- Fort Collins, CO
Lines: 17

>Finally one of our techs suggested that we try putting the terminators
>back in and voila everything worked fine. This 400t now has 2 760MB drives 
>and a cartridge tape all with terminators. We have brought up several other
>400t machines with the 760MB disks and everything seems to be working fine.

Your experiences don't match anything I've seen while testing a 400s.  The
only legal configuration for SCSI is a linear bus with one terminator at
each end (the 400 is terminated internally).  This configuration should
work fine if cable with proper electrical properties is used. 

With three external devices, you've got four loads on the bus, and are
running some risk of burning out interface chips.

>D. Gilbert Lee, Jr.

-Dave Kinsell
 kinsell@hpfcmb.hp.com