Basic Input/Output System (BIOS) is a software that is stored on a non-volatile ROM chip on the motherboard and BIOS is the first code run by a PC when powered on.

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Tamper-proof BIOS password & settings storage with Trusted Platform Module?

In the olden days, one could trivially bypass BIOS passwords on most PCs by removing the BIOS battery and clearing the CMOS. My question is: On modern PCs equipped with a Trusted Platform Module ...