DMA

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Article #14389

#14389

From: Walter Bright
Date: Thu, 06 Nov 1986 01:33

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I am interested in copying pixel data from one page to another on the
IBM EGA. This involves moving 128k bytes of data. Doing it with a
REP MOVSW takes about 1/2 second (on an AT), which is too slow.
Does anyone know
how the DMA channel could be programmed to do this? It is not clear
from the documentation how to program the DMA chip, or even if
it is capable of memory-to-memory transfers.

Thanks for any help.

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Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!rutgers!lll-crg!mordor!sri-spam!sri-unix!hplabs!tektronix!uw-beaver!tikal!amc!pilchuck!dataio!bright
From: bright@dataio.UUCP (Walter Bright)
Newsgroups: comp.sys.ibm.pc
Subject: DMA
Message-ID: <1189@dataio.UUCP>
Date: Wed, 5-Nov-86 20:33:09 EST
Article-I.D.: dataio.1189
Posted: Wed Nov  5 20:33:09 1986
Date-Received: Fri, 7-Nov-86 21:09:02 EST
Organization: Data I/O - FutureNet Corp., Redmond, WA
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