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<TITLE>Int 2F/AX=4000h
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Int 2F/AX=4000h - Windows 3+ (OS/2 2.x???) - GET VIRTUAL DEVICE DRIVER (VDD) CAPABILTIES -
AX = 4000h
Return: AL = video virtualization (see #02746)
Notes: This function is used by display drivers to find out what capabilities
exist for the VDD driver and also trigger the VDD driver to call
functions 4005h and 4006h (and 4001h/4002h under OS/2?). This
function also gives the Video Driver hardware access to the video
registers.
Once the background/foreground callouts have been activated by a
call to this function, the application *must* handle those callouts
and save/restore the video memory itself.
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<h2>Int 2F/AX=4000h
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<h3><font color=#C00040>Windows 3+ (OS/2 2.x???) - GET VIRTUAL DEVICE DRIVER (VDD) CAPABILTIES</font></h3>
<PRE>
AX = 4000h<br>
<p><b>Return:</b><br>AL = video virtualization (see #02746)
</PRE>
<p><b>Notes:</b>
This function is used by display drivers to find out what capabilities
exist for the VDD driver and also trigger the VDD driver to call
functions 4005h and 4006h (and 4001h/4002h under OS/2?). This
function also gives the Video Driver hardware access to the video
registers..
Once the background/foreground callouts have been activated by a
call to this function, the application *must* handle those callouts
and save/restore the video memory itself.
<PRE>
<p>
<a name=table2746></a>
(Table 02746)
Values for Windows video virtualization:
01h does not virtualize video access
02h virtualizes the video when in text mode
03h virtualizes the video when in text mode or single plane graphics modes
04h virtualizes the video when in text mode, single plane graphics modes,
and VGA multiplane modes
FFh virtualizes the video fully
</PRE>
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