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- Path: sparky!uunet!decwrl!waikato.ac.nz!comp.vuw.ac.nz!canterbury.ac.nz!cosc.canterbury.ac.nz!geoffrey
- Newsgroups: sci.electronics
- Subject: MODIFYING VGA cards for PCs
- Message-ID: <1992Sep11.202617.782@csc.canterbury.ac.nz>
- From: geoffrey@cosc.canterbury.ac.nz (Geoff Thomas)
- Date: 11 Sep 92 20:26:16 +1200
- Distribution: world
- Organization: Computer Science,University of Canterbury,New Zealand
- Nntp-Posting-Host: whio.cosc.canterbury.ac.nz
- Lines: 22
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-
- 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.
-
-
- 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.
-
-
- Any thanks much appreciated.
- Geoff Thomas.
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-