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address line A20 enabled

 
 
=?Utf-8?B?am9zaA==?=
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      07-21-2005
every time i try to boot from the trial CD, i get this error and its quite
annoying, does anyone have any solutions for this?

system:

amd64 3700+
1gb mushkin ram in dual channel
DFI lan party ut ultra-D nf4 motherboard
gigabyte 6600gt 128mb
80gig maxtor hard drive.
 
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Andre Da Costa [Extended64]
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      07-21-2005
Seems like a fine error to me.
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Andre
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"josh" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> every time i try to boot from the trial CD, i get this error and its quite
> annoying, does anyone have any solutions for this?
>
> system:
>
> amd64 3700+
> 1gb mushkin ram in dual channel
> DFI lan party ut ultra-D nf4 motherboard
> gigabyte 6600gt 128mb
> 80gig maxtor hard drive.



 
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Wessel Troost
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      07-21-2005
It's not an error.... it's a feature. From
http://support.microsoft.com/?kbid=71704:

When the A20 address line is enabled, a program can access the extended
memory in the HMA (high memory area). If the A20 line is not enabled,
calls to addresses above 1024K wrap back around to the bottom of memory
rather than accessing the extended memory within the HMA.

At one time, programmers used the method of addressing memory above 1024K,
knowing that the address would actually wrap back around to the beginning
of memory. Programmers found the wraparound effect to be useful for some
algorithms. If the A20 line is not disabled when a program that was
designed to wrap around is executed, the HMA will be overwritten.

Greetings,
Wessel
 
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