Mail Archives: djgpp/1996/12/02/01:51:38
On Mon, 2 Dec 1996, Bill Currie wrote:
> Glen Miner wrote:
> >
> > Is there any way for me to detect this? Does win95 raise any kind of
> > "refresh" signal that I can detect? I don't really want to do a
> > "video-memory" sanity poll; that would really suck.
> >
>
> This is gleened from Ralf Brown's iterrutp list:
>
> --------W-2F4005-----------------------------
> INT 2F C - Windows 3.x - SWITCHING DOS TO BACKGROUND
> AX = 4005h
> Note: called by Windows when the DOS box is about to be placed in the
> background and the video driver should save any necessary
> state
> information (this may be called only in Standard mode)
^^^^^^^^^^^^^^^^^^^^^
If the above note is indeed true, it makes this service all but unusable,
as far as I understand. I don't think there is any machine out there
which still runs Windows in Standard mode; almost evrybody nowadays uses
386-Enhanced mode. I would guess that Windows 95 doesn't issue this call
either (unless the Interrupt List is incorrect, and Enhanced mode issues
it too).
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