Roger Turk wrote:
>
> Clarence Verge wrote:
>
> Negative, Roger.
> All PCs have the ADDRESS range, sure. The first PCs only had 64k installed.<<
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
> You are right Clarence in what you said, but we are talking about two
> different things. The original PC's *did* have only 64K of *conventional*
> memory that could be used by programs, but *also* had 384K of "reserved
> memory" that was not useable by programs that started at address A000 and
> went to FFFF for use by adaptors, ROM, etc.
Hi Roger;
Your not going to get any work done today. <G>
That address range did NOT have any RAM in it in the pre 1985 PCs.
Yes, it was reserved - if that is the point - for adapter Rom and Bios,
but you can't load anything high if there is no ram there. (Except in a
special case where you can take advantage of unused BUT INSTALLED video
ram on some video cards. A special memeory manager is required.
- Clarence Verge
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