The video BIOS used to be the only interface between the operating system and the graphics processor in the past. However, that function has now been replaced by the graphics card driver. Currently, the built-in VGA functions are only used when running DOS or in the fail-safe mode of Windows 95 and above. The video BIOS is now mostly relegated to the role of providing identification to the graphics card driver as well as control of the graphics card clocks and GPU settings.
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