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From: eyal AT ise DOT canberra DOT edu DOT au (Eyal Lebedinsky)
Newsgroups: comp.os.msdos.djgpp
Subject: v2 and VBE grahics
Date: 26 Dec 1995 12:42:31 GMT
Organization: Eyal at home
Lines: 25
Sender: eyal AT e5 DOT pcug DOT org DOT au (Eyal Lebedinsky)
Message-ID: <4boqjn$1vv@supreme.pcug.org.au>
NNTP-Posting-Host: ts97.pcug.org.au
Keywords: VBE video
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

After asking a few time, I was told that v2 does not anymoe support
automatic bankswitching as v1 did (where go32 recognised page faults
in the video memory at 0xd0000000 and called the video driver to swich
banks).

So I wrote my graphics driver to take care of bank switching (I already
had the code laying around). The problem is that using interrupt 10
function 0x4f05 to switch banks is too *loody slow. I need some advice
of how to call the windows function from VBE info (it is a real mode
function so calling it should be done is a special way).

I would also like to know how to use the vew BVE 2.0 protected mode
interface: I understand that function 0x4f0a can be used to retrieve
a set of addresses which can then be directly called to do banking,
paging and DAC setup (replacing teh costly 05 07 and 09 subfunctions).

Anyone got an example?

BTW, this code is used in my Fly8 flight sim, and the abovementioned
effort so far is on our ftp site aa the latest beta (source only) release:
	ftp://csc.canberra.edu.au/pub/ise/eyal/fly8/beta
if anyone is interested.

--
Eyal Lebedinsky		(eyal AT ise DOT canberra DOT edu DOT au, eyal AT pcug DOT org DOT au)