Re: laptop external video under msdos

Then I tried
INT a 10 BF00
which should select external monitor -- nothing happened.
and
INT a 10 BF01
which should select internal monitor -- nothing happened.

Did you test it under plain DOS (which version) or under any windos?
I tested it under plain DOS version 7.1. I understand that this is a
somewhat "shady" dos version.

May be. But I still see a little chance to do it in DOS. Take a look
of the bios message of your VGA. It should come as first on boot.
Most VGA's have their own bios with their own extentions. If it is for
example a Cirrus Logic, then there is in the VGA-Bios an option to
switch from internal to external monitor.
I did not see a message at boot from the video BIOS. The computer BIOS
is Phoenix version F.07. The video board is NVIDIA GeForce Go 6150.

If I find some utility on the web that fiddles with the NVIDIA BIOS,
maybe that would do it. BUT I think these utilities will work under
windows, and then when I boot into dos maybe the settings are lost??
For example if I set external + internal video under windows xp the
normal way (not with special utility), these settings are lost when I
boot into dos.

Thanks again, Torsten.
Bill

.

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