15 Dec
2004
15 Dec
'04
4:35 p.m.
Hans Franke wrote:
I may have to disagree. Without EMS, XTs don't
have more than
992K of RAM. At least my XT systems did usualy offer at least
704K of continous RAM plus whatever was possible between the
You must have had a clone where system RAM and video RAM shared space, like a
Tandy 1000 or Amstrad. Regular IBM 5150 had usuable memory for the first 640K,
and then you could "use" the video RAM on a Hercules or CGA card if you were in
text mode and only using one page, but that was it.
cards. The 704K where supported by default, while for
the mem
inbetween a little programm at startup to relink the memory
had to run. works fine wit ANY dos version.
Only on your hardware :)
If you had a VGA in your XT (8 Bit VGA was available),
some
736K (708 as largest chunk) where possible without any addon
memory card, if you restricted yourself to colour (or 704+32K
when using Monocrome :)
Now I think you're confusing XTs with 386s -- Once the 386 was out, you could
remap how memory was laid out. I remember getting 736K of DOS RAM using
Quarterdeck's QEMM on my 386/16 with a VGA card... but that wasn't possible on
an XT.
And speaking of cache utils, there where quite some
available
for DOS, that could run on XTs - all you had to do is give up
main mem :)
Yep, tried that too :-)
--
Jim Leonard (trixter(a)oldskool.org) http://www.oldskool.org/
Want to help an ambitious games project? http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
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