From: authentic AT tip DOT nl (Rick)
Newsgroups: comp.os.msdos.djgpp
Subject: Refresh rates,VESA(30) and scitech
Date: Wed, 04 Feb 1998 19:00:55 GMT
Organization: NL-NIC
Lines: 40
Message-ID: <6bd2ao$hj6$1@cadmium.aware.nl>
Reply-To: authentic AT tip DOT nl
NNTP-Posting-Host: nijmegen-002.std.pop.tip.nl
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

Dear djgpp-ers,

I am sory to bother you with another question, but since allegro
uses high res modes I was "forced" to look into my  trident cards
failure for that 600*480( was only working for high color res!), etc.

What I discovered was not to nice: the trident drivers from
www.tridentmicro need that you reset the refresh rates "blindly",
so I dare to ask: does somebody know how programmatically reset the
refresh rate for a vesa mode ?( I am looking at vesa 20 specs but
didn't find anything useful).

Also since this is a not so uncommon problem for trident cards( at a
firm called Gigagon they devoted several web sites to it..) I would
like to know how most people fixed this, and also what to expect
as a programmer if you find that a graphix card supports a vesa mode.
It seems to me that it is not entiraly true to expect the mode to work
too!( for instance allegro demo, and the examples 23,31,32 which set
the autodetected the 600*480 mode) did not worked over here, because
of the above problem.

The third and last question is probably not to be answered here, if
anywhere maybe at c.l.a.x but anyhow, there is a package from scitech
that is by far the best in this arrea, because it allows you to set
the refresh rates modewise, because it supports VESA30 and because it
supports VESA/AF, but it is timelimited. If such a package existed
as freeware/shareware then maybe gameprogrammers could assume
that all vesamodes would work, so my question is: is anyone doing
this, and/or does anyone has intimate knowledge of all kind of graphix
cards and the way to put them into vesa30 ?? I assume this to be a
very hardware related question but anyhow: allegro programmers might
know a thing or two about it, not ??

Thanks for anything,

Rick
[http://www.scitechsoft.com has its package called sdd60a.exe]