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echo: os2prog
to: Peter Fitzsimmons
from: Mikael Kjellstrm
date: 1996-03-09 11:07:42
subject: Scroll question

> MK> And when the scrolling is going on the other programs
 > MK> gets no or close to no cpu at all.
 >
 > Your problem is caused by hardware;  your video card (or driver) is too
 > slow.

Yes, I know that my S3 864 2MB PCI is slow.  Therefore I'm going to buy a
Matrox Millenium that is way faster than my S3.


 >  Scrolling a text window requires a LOT of video memory to be moved
 > around.   Try:
 >
 >        1) A faster local-bus video card,  with a video driver that
 >           can take advantage of the firmware scrolling (some cards
 > support
 >           a hardware cursor too)

I believe that my S3 supports all of the above.


 >        2) A lower resolution (I bet "dir /s" will fly by at
640x480x16,
 >           because less video memory is involved)

That's correct.  It is fairly fast in 1024x768x256.  But I'm running
1024x768x65K now and that's not that fast.


 >        3) Run the program in a full screen session (where the whole
 > screen
 >           is typically 4k of memory,  vs 100's of KB in a window).

Textmode is faster than graphicsmode.  I allready knowed that.


 > MK> this effect.  I don't have the same problem when
 > MK> scrolling for example an E.EXE window.
 >
 > That's because E is not a "free running scroll" like
"dir /s".

I know.

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