Question: How does a computer boot from ROM... - China DOS Union Forum

Originally posted by cdl at 2004-10-7 00:00:
Regarding BIOS mapping to RAM: BIOS mapping to RAM is not necessary; it's just that running in ROM is too slow. It's mapped for faster execution. If the application doesn't frequently call BIOS, there's no need to map...

Disagree with your understanding

Only the initial part of the BIOS code doesn't need stack.
If you continue, most of the BIOS function implementations require stack support, even though it's in real mode.
So I disagree that RAM is not necessary.

Although Windows has its own drivers, it still needs BIOS to boot. The current computer architecture is like this, unless Microsoft writes something to boot its own operating system.

Floor31　beiyuly	Posted 2006-10-13 21:07
初级用户　Posts 40　Credits 95
Originally posted by cdl at 2004-10-7 00:00: Regarding BIOS mapping to RAM: BIOS mapping to RAM is not necessary; it's just that running in ROM is too slow. It's mapped for faster execution. If the application doesn't frequently call BIOS, there's no need to map... Disagree with your understanding Only the initial part of the BIOS code doesn't need stack. If you continue, most of the BIOS function implementations require stack support, even though it's in real mode. So I disagree that RAM is not necessary. Although Windows has its own drivers, it still needs BIOS to boot. The current computer architecture is like this, unless Microsoft writes something to boot its own operating system.

Floor32　jipinshangren	Posted 2008-08-17 17:13
初级用户　Posts 62　Credits 120　From 四川内江
Great, there's something new in my head! Thanks!