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Why BIOS is used in booting the computer?

Updated: 8/21/2019
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7y ago

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The BIOS contains two things: the low level bootstrap code, and simple I/O drivers for the devices built into the motherboard.

Without the low level bootstrap code to initialize the CPU and system hardware there would be no way of loading the high level bootstrap code from disk that will load the OS.

The simple I/O drivers will be used by the low level bootstrap code, the high level bootstrap code, and also initially by the OS (until it installs its own I/O drivers).

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Q: Why BIOS is used in booting the computer?
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