Date: Mon, 17 Oct 94 18:45:50 GMT
From: dolan AT fnoc DOT navy DOT mil (Kent Dolan)
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: VGA low level programming

I don't do this stuff myself, but I picked up a copy of _Advanced
Programmer's Guide to SuperVGAs_, _The advanced Programmer's Graphic
Library_, Volume II, George Sutty and Steve Blair,, Brady -- Simon &
Schuster, 1990, ISBN 0-13-010455-8, from an office used book sale.  I
pulled this down to see if it answered the earlier question, and it
looks like the vertical flyback can be filtered out from an interrupt.

I don't trust my understanding enough to type in enough to be helpful,
but check out chapter 3, "VGA Registers", which seems to have
everything you need to avoid waiting in a hot loop for vertical
retrace.

Xanthian.
--
Kent, the man from xanth.
Kent Paul Dolan, CSC contractor at Fleet Numerical.  (408) 656-4363.
(Navy Unix email:   )  (Navy cc:Mail email: )  (real world email:     )
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