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From: info-vax@ucbvax.UUCP
Newsgroups: mod.computers.vax
Subject: Re: X-off Problem (help wanted)
Message-ID: <8601081912.AA15699@ucbvax.berkeley.edu>
Date: Wed, 8-Jan-86 14:12:53 EST
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Posted: Wed Jan  8 14:12:53 1986
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Runing a 750 we had the same problem with a dz.  It truned out to be a
combnation of things.

The unibus had a flaky pin that woudl short to the one next to it.  This would
cause spiks to be sent through the board (after a spike we could not talk 
to the bord.)   This eventualy damaged the bord.  DEC replaced it several 
times.  After a coupel of trys we put it in a diffrent slot.

Dec eventuraly gave us a new backplane because we had trouble with another
slot.  It took 2 years to get every thing fixed.

Good luck.