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- Newsgroups: sci.electronics
- Path: sparky!uunet!nih-csl!helix.nih.gov!arm
- From: arm@helix.nih.gov (Andrew Mitz)
- Subject: Re: MODIFYING VGA cards for PCs
- Message-ID: <1992Sep11.135535.13798@alw.nih.gov>
- Followup-To: sci.electronics
- Keywords: VGA
- Sender: arm@helix.nih.gov
- Organization: National Institutes of Health, Bethesda
- References: <1992Sep11.202617.782@csc.canterbury.ac.nz>
- Date: Fri, 11 Sep 1992 13:55:35 GMT
- Lines: 37
-
- 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).
-
-
-
- -------------------------------------------------
- Andrew Mitz | NIH Animal Center
- Biomedical Engineer | Poolesville, MD
- -------------------------------------------------
-
- All opinions expressed are my own.
-
-
-