Windows & BIOS ?

[asmfan]

I heard some rumours that Windows doesnt use the BIOS functions but use its own implementation of working with devices via I/O ports. I wonder is it truth?

[Tedd]

Yes.
It's true for most 32-bit OSes. Bios functions are mostly 16-bit, so it causes problems/difficulties.
Bios is used for booting, but after that it's mostly ignored.

[asmfan]

Thanks Tedd all the rumours seem to be truth... BIOS is used mainly by OS loader and then its functions are totally(!) ignored, am i right?

[Tedd]

Yes.
But not 'totally(!)' :P There are a few system management things that some bioses do, but this isn't used by the os, it just works by itself.