Date: Mon, 2 Dec 1996 08:39:34 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To: Bill Currie <billc AT blackmagic DOT tait DOT co DOT nz>
Cc: Glen Miner <gminer AT Newbridge DOT COM>, djgpp AT delorie DOT com
Subject: Re: Djgpp and Windoze Refresh
In-Reply-To: <32A2D75D.39DC@blackmagic.tait.co.nz>
Message-Id: <Pine.SUN.3.91.961202083553.14161G-100000@is>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


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).