Re: 8088 and 610 saga continues...

From: Bill Degnan <>
Date: Mon, 24 Jan 2011 14:30:29 -0500
Message-ID: <7217cf84$1e6e997a$ac1ea51$@com>
Can anyone else try this with their system / 8088?  I can't do it today, but later this week I could check to see if I have the same effect.  

Bill Degnan

-------- Original Message --------
> From: "Michal Pleban" <>
> Sent: Monday, January 24, 2011 2:11 PM
> To:
> Subject: Re: 8088 and 610 saga continues...
> Hello!
> W dniu 2011-01-23 16:49, Hoffmann-Vetter, Martin pisze:
> > Is this the only address that was changed? Can you test it?
> Now, it gets very interesting! I downloaded three different memory dumps
> after MS-DOS hung, and here's what I found:
> EVERY byte with address xx21 and xxA1 gets corrupted with random values.
> At 0021 it is usually zero, although once I saw a $C1 value. But with
> other bytes, it's totally random and unrelated to the original value.
> How is it possible that every xx21 and xxA1 byte gets corrupted this
> way? It seems likely to me that something is playing very rudely with
> DRAM control lines and overwriting a location in all memory columns at
> once. I am not knowledgeable with DRAM chips so don't know whether this
> is at all possible?
> Or maybe it is a different problem. Maybe these locations are not
> overwritten by anything, but they are not refreshed? Something causes
> these two rows to not be refreshed? Does it make any sense?
> Regards,
> Michau.
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Received on 2011-01-24 20:00:21

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