DMA transfers RAM to RAM

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#515

From: egg
Date: Tue, 28 Jul 1992 15:53

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 I am lead to beleive it is possible to do DMA transfers RAM to RAM.
 If possible, could somebody please post a summary of how to do it on an AT.
 Information on how long such transfers take would also be appreciated.

 My motivation is to write a video update routine to move data to and from
 video ram independent of the cpu.

 Thanks in advance.

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===============================================================================
Themie Gouthas
Aeronautical Research Laboratory
Defence Science and Technology Organisation
Salisbury, South Australia

InterNet: egg@dstos3.dsto.gov.au

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Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!yoyo.aarnet.edu.au!dstos3.dsto.gov.au!egg
From: egg@dstos3.dsto.gov.au
Newsgroups: comp.os.msdos.programmer
Subject: DMA transfers RAM to RAM
Message-ID: <1992Jul28.095332.164275@dstos3.dsto.gov.au>
Date: 28 Jul 92 15:53:32 GMT
Organization: Defence Science and Technology Organisation
Lines: 18