DMA and port 63h

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#599

From: Mats Fraennhagen
Date: Thu, 05 Nov 1992 12:27

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Hi!

I have two questions:

 1) Is the DMA-chip faster than using "rep movsw", which takes
     CX*4 clocks(286), when transfering for instance a
     320x200x256 screen from "ordinary" memory to "graphics" 
     memory ?

 2) What function has port 63h ? One bit turns the speaker on and
    off(?) but what about the others.

 /Mats 


-- 
 Mats Fraennhagen 	Email: d91mf@efd.lth.se

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Newsgroups: alt.msdos.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!elroy.jpl.nasa.gov!usc!sol.ctr.columbia.edu!ira.uka.de!math.fu-berlin.de!news.netmbx.de!Germany.EU.net!mcsun!sunic!lth.se!efd.lth.se!d91mf
From: d91mf@efd.lth.se (Mats Fraennhagen)
Subject: DMA and port 63h
Message-ID: <1992Nov5.122728.5055@lth.se>
Keywords: DMA and port 63h
Sender: newsuser@lth.se (LTH network news server)
Reply-To: d91mf@efd.lth.se (Mats Fraennhagen)
Organization: Lund Institute of Technology
Date: Thu, 5 Nov 1992 12:27:28 GMT
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