Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cwjcc!cwlim.INS.CWRU.Edu!david
From: david@cwlim.INS.CWRU.Edu
Newsgroups: comp.sys.att
Subject: 20Mhz 6386 memory blues
Message-ID: <918@cwjcc.CWRU.Edu>
Date: 28 Nov 89 23:31:26 GMT
Sender: news@cwjcc.CWRU.Edu
Reply-To: david@cwlim.INS.CWRU.Edu ()
Organization: Case Western Reserve Univ. Cleveland, Ohio, (USA)
Lines: 35

Why do AT&T machines always seem to be at the heart of the trouble?

I have (I had no choice in the matter) AT&T 6386 20Mhz machine for
my Novell file servers.  That might not be so bad in a normal situation, 
but who's network is even remotly normal?  Anyway, I have had to put 
more then one meg of RAM in each machine.  Presently, I have two Meg in
one and four Meg in three others.  My machine with two Meg has decided
to lock up on a regular basis--cause:  presumed memory.
Two of the three machine with four Mag have it in 256k SIMMS, so the 
card is full, and there is no expansion room and no trouble.  Well,
I decided to put one Meg SIMMS in a servers to give it four meg with
expansion room.  The memory has appeared to be totally compatable, it
is 9 chips of 80 ns.  Macs love it (the only SIMM tester I have) but,
the AT&T machine don't.  With 12 one meg SIMMS, I was only able to get 
four to work in the AT&T machines.  The other would not allow the 
machine to boot, for that matter, they couldn't even pull up a display
or reset the keyboard (the three lights remain on.)  I have also noticed
that the settings I have gotten the card and memory to operate with, 
whether 256k SIMMS or 1 Meg SIMMS, unless there is the standard four
256k SIMMS, the switch setting on the card do not match the book.  I don't
get it.  I need to put some AT&T CERTIFIED memory in my file servers and
I don't know how to set the card to match the book and have the machine
operate.  I don't care at this point if I  have to pay more then the 
going rate to get proven AT&T 100% reliable memory, preferablly in
four meg SIMM modules.  Any information, help, or other information
anyone can provide would be greatly appreciated to the Nth degree.
Thank you.  
                                Dave

david@cwlim.ins.cwru.edu                     dwn@pyrite.som.cwru.edu


P.S.  I have notice some stand alone computers (the same internals) with
      one Meg straight from the warehouse have the same trouble booting.
      I suspect memory.  Perhaps a timing problem?