BIOS Boot Specification
Since these two methods don't offer a large amount of control over the boot process, the BIOS Boot Specification (BBS) was developed. This provided a more standardized approach where an option ROM could be initialized at the start of the boot process, it could inform the BIOS about its functionality, and then it could be called later on in the boot process depending on the order the user had selected.
Read more about this topic: Option ROM, Standard IBM PC BIOS
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