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From: roger@wrq.com (Roger Fulton)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Dual Monitor Switching
Message-ID: <18203@milton.u.washington.edu>
Date: 11 Mar 91 23:04:13 GMT
References: <1991Mar11.172914.4450@engin.umich.edu>
Sender: news@milton.u.washington.edu
Organization: Walker Richer & Quinn, Inc., Seattle, WA
Lines: 31

In article <1991Mar11.172914.4450@engin.umich.edu> pong@caen.engin.umich.edu (Bryan John Jalowitz) writes:
>
>Hi,
>I would like to know how, from within an application, I can switch
>monitors in a dual configuration.  I would like something similar to
>"mode mono" vs. "mode co80", but that does not clear the display.
>
>More specifically, I am using a VGA/HERC dual monitor configuration,
>and I would like to be able to route text/graphics to one or the other
>display systems.  I know about setting the mode with int 10h func 0,
>but there appears to be more to it than that.  That doesn't "switch" the
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>video bios' notion of the current display.

Yes, there is.  In addition to setting the video mode,
you need to also update the equipment flag at 0040:0010
appropriately: xx10xxxx for color, xx11xxxx for mono
(where 'x' means leave it alone).  Also, you should account
for the fact that color systems have a different maximum
cursor line count than mono systems (so you should save and
restore the cursor when changing video modes).






.
-- 
Roger Fulton
roger@wrq.com