VGA Memory Mapping

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#2709

From: Thomas Bullinger
Date: Thu, 18 Oct 1990 17:42

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We have been trying unsuccessfully to address the video memory
on a VGA card directly. (No portability flames please) We are using
Trident chips in mode 0x5D, 640 x 480, 256 colors. This should
require 5, 64K pages mapped into the address space starting at 0xA000:0.
The one book we read said that the page swap register was at IO address
0x03c5, when 0x03c5 was set to 2. Is this correct?? How hardware dependant
is this technique?? Anybody out there done this yet?? How about a brief
code example in Turbo C or Turbo Pascal? Thanks in advance!

	tom and craig..

      ..!cci632!rd7!tom     -or-    tom%rd7@cci632

"Only he who is willing to give up his monopoly on truth can ever profit
 from the truths that others hold...no man has the final answer but
 every man has a piece to contribute."	 --Unknown (to me anyway)

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!julius.cs.uiuc.edu!rpi!uupsi!cci632!tom
From: tom@cci632.UUCP (Thomas Bullinger)
Newsgroups: comp.os.msdos.programmer
Subject: VGA Memory Mapping
Keywords: Help!
Message-ID: <41002@cci632.UUCP>
Date: 18 Oct 90 17:42:12 GMT
Organization: Computer Consoles Inc. An STC Company, Rochester NY
Lines: 16