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Line 5: Also note that some of the bios detection/state result is stored in the [http://www.nondot.org/sabre/os/files/Booting/BIOS_SEG.txt Bios Data Area]. All the "persistent" state of the BIOS is kept in the [[CMOS]] chip. Unfortunately, in [[Protected ~~Mode~~mode]], most of BIOS services become unavailable and trying to call them nonetheless will result in exceptions or unreliable responses because of the different way '''segment''' values are handled. Some newer services however (like SMBios, PCI and PnP, or VBE) offer an interface that is compatible with 32bits operations. If you still need the other services in [[Protected Mode]], see [[Virtual 8086 Mode]].

BIOS: Difference between revisions

BIOS (view source)