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From: Tom Dunigan <dunigan@ornl-msr.ARPA>
Newsgroups: net.unix-wizards
Subject: EMC 2MB memory boards on 780 crashes 4.2
Message-ID: <7667@brl-tgr.ARPA>
Date: Wed, 23-Jan-85 21:51:49 EST
Article-I.D.: brl-tgr.7667
Posted: Wed Jan 23 21:51:49 1985
Date-Received: Mon, 28-Jan-85 05:54:15 EST
Sender: news@brl-tgr.ARPA
Organization: Ballistic Research Lab
Lines: 16

Help, Just added 4 Mbytes of EMC memory (2 Meg per board)
to existing 4 Meg of DEC E type memory.  DEC diagnostics
show all well; configuration at boot shows 8meg, but
shortly after (not immediately) programs start running
in the upper 4 Meg (EMC memory) the system crashes either
with no panic or various flavors of panics, plus strange
happenings on user terminals.  Removing the DEC memory
and running only with EMC memory, UNIX gets through configure
but never comes out of fsck on root  (disk is flashing) . . .
HOWEVER, booting up VMS with only EMC memory works fine.

What magic do I need? It is as if the interleaving or
or page mapping is faltering . . ..  

thanks
  dunigan@ornl-msr