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From: bill@ssbn.UUCP (Bill Kennedy)
Newsgroups: comp.sys.att
Subject: Re: PC6300PLUS Mem Test
Message-ID: <351@ssbn.UUCP>
Date: Fri, 4-Sep-87 03:56:13 EDT
Article-I.D.: ssbn.351
Posted: Fri Sep  4 03:56:13 1987
Date-Received: Sun, 6-Sep-87 02:19:04 EDT
References: <148@westmark.UUCP>
Reply-To: bill@ssbn.UUCP (Bill Kennedy)
Distribution: na
Organization: W.L. Kennedy Jr. & Associates, Pipe Creek, TX
Lines: 30
Keywords: Extended Memory

In article <148@westmark.UUCP> dave@westmark.UUCP (Dave Levenson) writes:
>I have a PC6300PLUS with 1 Mbyte on the motherboard, and 2 Mbytes on
>an AT&T "Enhanced Extended Memory" board.
>
>The standard diagnostics for the machine (Customer and System
>diagnostics) test the memory on the motherboard, but seem to ignore
>the expansion board.  They also seem to test the motherboard memory
>very quickly when the expansion board is installed, as if the test
>is somehow skipping some of the memory.
>
>Does anyone know how one is supposed to test this memory?
>
Here here!  I have two 2Mb memory boards and the same problem, other than
the ROM firmware everybody seems to ignore the memory beyond 1Mb.  There
is a way, albeit *very ugly* to test the additional memory, but there's
bound to be a better way.

I tripped over an odd situation regarding the ROM memory test.  I had a bad
RAM chip.  The memory test kept failing and I couldn't figure out why.  It
turns out that my instincts were stale.  The chip was waking up at its own
address and the address in the row next door.  There's nothing new about
that it's just that it has been so long since I got a bad chip that I had
forgotten what it loked like/how to look.

If anybody has a test for memory beyond the 1Mb, please send it along or
point me at it, I'll send it to the PC 6300 PLUS mailing list as well as
posting it (if it is short).

-- 
Bill Kennedy  {cbosgd | ihnp4!petro | sun!texsun!rrm}!ssbn!bill