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Article #4865Re: DMA questions.
From: Jorgen Wahlsten
Date: Sat, 23 Feb 1991 01:32
Date: Sat, 23 Feb 1991 01:32
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In article <8bl2yqS00WB401Skhj@andrew.cmu.edu> ps2x+@andrew.cmu.edu (Peter John Skelly) writes: >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. With a PC it will be hard... There is only four DMA-channels (0 to 3) and one can only use DMA-channels 0 and 1 (together) to do memory to memory copies. Unfortunatly they are already used to do memory-refresh... But isn't it two DMA-chips inside an AT ?!? If so one would be able to use DMA-channels 0 and 1 in the second DMA.
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Path: arc1-ca.pugleaf.net!utzoo!attcan!telly!lethe!yunexus!ists!helios.physics.utoronto.ca!news-server.csri.toronto.edu!bonnie.concordia.ca!nstn.ns.ca!news.cs.indiana.edu!news.nd.edu!spool.mu.edu!uwm.edu!wuarchive!rice!uupsi!sunic!kth.se!news From: wahlsten@elixir.lne.kth.se (Jorgen Wahlsten) Newsgroups: comp.os.msdos.programmer Subject: Re: DMA questions. Message-ID: <1991Feb23.013210.16165@kth.se> Date: 23 Feb 91 01:32:10 GMT References: <8bl2yqS00WB401Skhj@andrew.cmu.edu> Organization: Dept. of EE, Royal Institute of Technology, Stockholm, Sweden Lines: 11