26 Nov
2006
26 Nov
'06
2:45 p.m.
Using a Tecmar Graphics Master in a DTK XT clone, I could get, IIRC, 704 KB
of RAM.
Bob
From: "Chuck Guzis" <cclist at
sydex.com>
Reply-To: "General Discussion: On-Topic and Off-Topic
Posts"<cctalk at classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Subject: Re: PC Memory maps (was: Re: 486 w/newer IDE drives)
Date: Fri, 24 Nov 2006 11:30:11 -0800
On 24 Nov 2006 at 14:07, Sean Conner wrote:
_________________________________________________________________
Stay up-to-date with your friends through the Windows Live Spaces friends
list.
http://clk.atdmt.com/MSN/go/msnnkwsp0070000001msn/direct/01/?href=http://sp…
The major problem with that is MS-DOS---it
can't handle non-contiguous
RAM
and therefore there is no standard way to reserve
or use memory in the
upper
384K of the address space (well, for those
PClones that followed the IBM
spec).
I seem to recall a few PCs with built-in CGA display adapters gave
one more contiguous memory than 640K by filling the space between
A000 and C000 with RAM. And many "not very compatible" PCs running
MS-DOS made the entire 1MB available.
Anyone with an old Visual Commuter want to verify this? I think that
the Commuter was one of the aforementioned.
Cheers,
Chuck