Article View: comp.os.msdos.programmer
Article #5543Re: Dual Monitor Switching
From: Bryan John Jalowitz
Date: Tue, 12 Mar 1991 17:58
Date: Tue, 12 Mar 1991 17:58
28 lines
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1518 bytes
In article <1991Mar12.133739.28811@cbnewsh.att.com> rkl@cbnewsh.att.com (kevin.laux) writes:
>
> You're missing Int 10h Function 12h Subfunction 35h, the Display
>Switch Interface.
>
> AH: 12h
> BL: 35h
> AL: 0 Initial external adapter off
> 1 Initial VGA on
> 2 Active adapter off
> 3 Inactive adapter on
> ES: Segment of Switch State area
> DX: Offset of Switch State area
>
> The first time you switch displays you must use AL=0,1. After that,
>you use a double call to AL=2,3. The Switch state area is a 128 byte buffer
>and each display needs it own.
>
My documentation ("Programmer's guide to PC & PS/2 video systems", Microsoft
Press) says that this function is for PS/2 video systems. I tried it
anyway, in case the book's information was old, however I do not get a
successful return value. I am using an AT clone with both cards on an
ISA bus. Should this still apply?
Any other ideas?
Tony Whipple
Tony_Whipple@um.cc.umich.edu
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Path: arc1-ca.pugleaf.net!utzoo!censor!geac!torsqnt!lethe!telly!attcan!uunet!samsung!caen!zeus.engin.umich.edu!pong From: pong@caen.engin.umich.edu (Bryan John Jalowitz) Newsgroups: comp.os.msdos.programmer Subject: Re: Dual Monitor Switching Message-ID: <1991Mar12.175839.1687@engin.umich.edu> Date: 12 Mar 91 17:58:39 GMT References: <1991Mar11.172914.4450@engin.umich.edu> <1991Mar12.133739.28811@cbnewsh.att.com> Sender: news@engin.umich.edu (CAEN Netnews) Distribution: na Organization: University of Michigan Engineering, Ann Arbor Lines: 28