🚀 go-pugleaf

In article <1992Sep11.202617.782@csc.canterbury.ac.nz> geoffrey@cosc.canterbury.ac.nz (Geoff Thomas) writes:
>
>A few questions about modifying VGA cards:
>
>
>1) How can I cram 2 VGA cards into a PC, and have them independently
>addressable? Because of the way DOS handles it's video address space,
>only one card can reside in the video address space, but what if, on a
>3/486 the other card could be given a different address space that
>doesn't clash with the first, and could be addressed via protected mode
>on the 3/486.
>
The good news is that at least one company makes a dual VGA card.
It supports its own special software to switch between the two
VGA adapters on the same card.  The bad news is that I cannot find
my file on special VGA cards.  :-(

>2) Any ideas on how to give the VGA card a flat video memory, rather
>than a paged one?
>
>3) Lastly, is it possible to speed up writes to the video address space?
>Currently its quite slow, and I want to speed it up.
>
The solution to 2 and 3 are to consider video cards that are not VGA.
These can co-exist with VGA cards.  See, for example, some of the 
cards by Number Nine (617-492-0999).



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Andrew Mitz          |    NIH Animal Center
Biomedical Engineer  |    Poolesville, MD
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All opinions expressed are my own.