Basic Ingoing-Outgoing System (IIRC) but what does it really mean?
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Computers have a problem in that they need at least a small operating system to load the main operating system from storage. BIOS and now UEFI are tiny OS that do that. They load from a piece of non volatile memory on the motherboard, run the hardware to find the OS, load that, then give it control over the system.
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