Thread View: comp.os.msdos.programmer
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Started by Peter Joachim Unold
Sat, 23 Jan 1993 15:16
DMA memory->memory question
Author: Peter Joachim Unold
Date: Sat, 23 Jan 1993 15:16
Date: Sat, 23 Jan 1993 15:16
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Questions:
1) Does memory->memory DMA, in the mainmemory work on all PCs?
2) Using a program I found in the now dead >The Assembly Language Magazine<
I was able to move a constant value into the memory on my VGA card. The
program was supposed to be able to copy, but it only moved a constant
into the memory. This effect could be very useful for clearing the screen.
But will it also work with VGA cards from other vendors?(mine is a tseng3k).
-hope some hardware wizards will answer
Peter Unold - pjunold@daimi.aau.dk
Re: DMA memory->memory question
Author: John A. Slagel
Date: Mon, 25 Jan 1993 15:47
Date: Mon, 25 Jan 1993 15:47
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pjunold@daimi.aau.dk (Peter Joachim Unold) writes:
>Questions:
>1) Does memory->memory DMA, in the mainmemory work on all PCs?
No. Even if it did, the REP MOVSD is faster.
This was a topic of conversation a year ago. This was the conclusion
that was reached. There was one guy who knew what hardware needed
to be implemented... he said that technically, it should work, but
most motherboard manufacturers don't bother putting that circuitry
in because its not supported.
--
-----------------------------------------------------------------------------
John A. Slagel "My old man used to tell me, before he left this
j-slagel1@uiuc.edu shitty world, never chase buses or women- you
(217) 337-7930 always get left behind." -The Marlboro Man
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