Help! How do I do DMA in a DOS window?

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#3353

From: Real Ouellet
Date: Fri, 08 Jan 1993 03:47

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I have this wuestion from a friend of mine:

He is working on a program that does DMA data transfers with a hardware data
acquisition card and, after having correctly programmed the DMA chip, his
program bombs out under OS/2 (sometimes makes OS/2 to crash as well!).

This program works very well under normal DOS, in Windows 3.1, using special
settings recommended by Microsoft for DMA transfers.

Question: are there settings with OS/2 that allow DMA transfers to work better
(at all, actually...)? He understands DMA transfers are virtualized and
knows of the existence of the "VDMA.SYS" driver, but does not know how to use
it.

He is using a version of OS/2 that has been updated with IBM's CSD.

Please feel free to reply by e-mail or in this forum, if you judge the subject
to be of general interest.

Many thanks!

Real Ouellet
LAVAL University
Dept. Elec. Engineering
rouellet@gel.ulaval.ca

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From: rouellet@gel.ulaval.ca (Real Ouellet)
Newsgroups: comp.os.os2.programmer
Subject: Help! How do I do DMA in a DOS window?
Message-ID: <rouellet.726464840@ragueneau>
Date: 8 Jan 93 03:47:20 GMT
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