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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.
(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
Category: Windows - Int 2Fh - W
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