QEMU, AX=4F00 INT 10h (Return VBE controller information) reports itself as 
version 3.0.
So I use http://www.petesqbsite.com/sections/tutorials/tuts/vbe3.pdf

Capabilities:
D0=0 DAC is fixed width, with 6 bits per primary color
D1=0 Controller is VGA compatible
D2=0Normal RAMDAC operations
D3=0 No hardware stereoscopic signaling

So D0=0, as I was expecting for QEMU.


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