Page "Booting" Paragraph 40

Some systems ( particularly newer Macintoshes and new editions of Microsoft Windows ) use Intel's EFI.

Also coreboot allows a computer to boot without having the firmware / BIOS constantly running in system management mode.

16-bit BIOS interfaces are required by certain x86 operating systems, such as DOS and Windows 3. 1 / 95 / 98 ( and all when not booted via UEFI ).

However, most boot loaders retain 16-bit support BIOS call support.