Re: 8088 and 610 saga continues...

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" <lists@michau.name>
> Sent: Monday, January 24, 2011 2:11 PM
> To: cbm-hackers@musoftware.de
> 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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