Re: DMA questions.

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Article #4849

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#4849

From: Ralf.Brown
Date: Fri, 22 Feb 1991 12:48

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In article <8bl2yqS00WB401Skhj@andrew.cmu.edu>, Peter John Skelly <ps2x+@andrew.cmu.edu> wrote:
}Does anyone know if it is possible to program the dma chip used in pc's to
}do memory to memory copies.  I've heard both ways, but if someone knows for
}sure either way, I'd like to know.
}
}If it is possible, some suggestions on how would be useful.

My understanding is that memory-memory DMA is only possible using channels 0
and 1, and channel 0 is used for DRAM refresh.	That would make things rather
tricky even if possible at all.
--
{backbone}!cs.cmu.edu!ralf  ARPA: RALF@CS.CMU.EDU   FIDO: Ralf Brown 1:129/3.1
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DISCLAIMER?  Did  | It isn't what we don't know that gives us trouble, it's
I claim something?| what we know that ain't so.  --Will Rogers

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From: Ralf.Brown@B.GP.CS.CMU.EDU
Newsgroups: comp.os.msdos.programmer
Subject: Re: DMA questions.
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Date: 22 Feb 91 12:48:38 GMT
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