Thread View: rec.games.programmer
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2 total messages
Started by Chad Collins
Mon, 13 Apr 1992 04:03
VGA's Memmory Organization.
Author: Chad Collins
Date: Mon, 13 Apr 1992 04:03
Date: Mon, 13 Apr 1992 04:03
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I was wondering if I could get some help in programming the VGA's memory directly. I am trying to us mode 13h (320 x 200 x 256) by writing directly to the VGA's memory and I wanted to be able to use the memory above segment 0xa000 to create my own video pages. The only thing I can think of here is that it uses the Map Mask register like the other VGA modes to have memory planes but I have never seen this writen anywhere or explained (i.e. is it four planes of 64k and 0xa000 or two of 128k from 0xa000 and 0xb000?). I would apprectiate any help... Thanks. Chad R. Collins collins@huey.cc.utexas.edu
Re: VGA's Memmory Organization.
Author: Christopher Hecker
Date: Thu, 16 Apr 1992 05:12
Date: Thu, 16 Apr 1992 05:12
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The vga memory in mode 13h is in chain4 mode, so you cannot access any more than 64k. In order to page flip you will need to use another mode, like mode X. Chris
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