From: Paul Shirley <Paul AT no DOT spam DOT please>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: DJGPP, interprocess communication, and DPMI
Date: Tue, 23 Sep 1997 12:11:58 +0100
Organization: wot? me?
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References: <341FEC5F DOT 77F2 AT EnchantedLearning DOT com> <3420BBED DOT 23F69891 AT juno DOT com>
 <3426BC71 DOT 7420 AT enchantedlearning DOT com>
 <19970922 DOT 144526 DOT 9110 DOT 7 DOT bshadwick AT juno DOT com>
Reply-To: Paul Shirley <Paul AT chocolat DOT obvious DOT fake DOT foobar DOT co DOT uk>
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In article <19970922 DOT 144526 DOT 9110 DOT 7 DOT bshadwick AT juno DOT com>, Ben N Shadwick
<bshadwick AT juno DOT com> writes
>>Ben N Shadwick wrote:
>>I set up a DOS program using exactly the same SVGA mode as my
>>Win95 screen, used Alt-Tab to switch back and forth between the
>>Win95 desktop and the full-screen DOS program, and it worked
>>correctly on my system (except for not restoring the border colors).
>
>Interesting. What video card did you say you had again? How much RAM does
>it have?
>
>>Maybe Win95 tries to save the video memory of the swapped-out process
>>if it can find enough RAM (or virtual memory) to do it?
>
>Maybe, although I have a feeling it doesn't even attempt to swap it
>anywhere on my computer. Maybe it's bold enough to at least swap it to
>another location in video memory, but that seems dangerous to me. I'll
>certainly have to try it again if I ever get a new video card =)

Windoze seems to only understand some standard screen modes (and
possibly a few 'unusual' ones), choose one it does not know how to
handle and it fails to restore the window. I believe its a problem in
the screen grabber (possibly aided by your SGVA driver). I cannot safely
use 132*60 textmode because of this little oversight.

Windoze is a bottomless pit of bugs and unimplemented features...


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