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VGA graphic mode 12h

Posted on 2002-05-02
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Last Modified: 2010-04-15
I want to do some graphics in VGA mode 12h.
I know to switch to that mode.
And I know writing directly to the video memory,but i could only put white pixels.
I want colors.Help!
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Question by:darko_poljak
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Expert Comment

by:HobbitHouse
ID: 6987039
I believe that the memeory layering of graphics cards has become more complex than was the case back when it used to be possible to do such straightforward things as use mode 12h.  You should see if you can get programming specs from your video card manufacturer.

I could be wrong about this, but it's a thought.
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Jan Louwerens earned 50 total points
ID: 6987525
Your problem is that you're probably only writing to 1 of the 4 bitplanes of that video mode. Here's an explanation of the different bitplanes and how to access them:
http://www.bsdg.org/swag/EGAVGA/0222.PAS.html

In this day and age, it is very silly to be programming VGA hardware directly. There are many good graphics SDKs (such as OpenGL or DirectX) that give you much more power and flexibility over the graphics card, and also make it much easier for you to do so.
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