flat assembler
Message board for the users of flat assembler.
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Chewy509
What are you wanting to do? Access the basic VGA (aka 6845) controller, or do program the accelerator on the chip?
For the basic VGA stuff, you can still use the legacy ports 3b4h, 3c4h and 3d4h. (3b4 = mono, 3c4 = generic, 3d4 = colour). |
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cylo
i need to change the screen refresh rate in svga.
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Chewy509
Have you looked at the VESA specs? (www.vesa.org). I'm pretty sure VESA includes functions for this...
PS. To change the refresh, rate requires calculating all the sync rates for the RAMDAC. (You'll end up basically programming the graphics mode by hand). Does the documentation you have, include all this info? |
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