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Virtual Scrrens in 640x400x256
Posted on 2000-04-16
I've figured out how to use virtual screens in mode 13h. Now I am trying to change to 640x400 at 256 colors.I initialized the graphics with a super vesa unit I found and all i get is the top quarter of the screen. Turbo pascal will not let me make the array any bigger. What should I do?
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5 Comments
In Vesa modes you should not use thoes "virtual screens" you are talking about,
You should use Virtual screens located in the videomemory instead of the systemmemory.
I suppose youre program runs in "Real Mode". Since in there, segments can't be larger than 64K, So you can't make arrays larger than that either. Anyway, If you re using virtual screens with a videomode such as 640x480x256, Pageflipping is the way to go. Not virtual screens.
I'm working on a VESA unit. So If you have an EMail where I could send it to you, along with the explaination of how it works. You wouldn't have this problem.
You should use Virtual screens located in the videomemory instead of the systemmemory.
I suppose youre program runs in "Real Mode". Since in there, segments can't be larger than 64K, So you can't make arrays larger than that either. Anyway, If you re using virtual screens with a videomode such as 640x480x256, Pageflipping is the way to go. Not virtual screens.
I'm working on a VESA unit. So If you have an EMail where I could send it to you, along with the explaination of how it works. You wouldn't have this problem.
you have to use 'bank-switching' mechanism... try to 'search' in this area, this question was answered a month/two ago...
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