Managing and updating your bios

The first thing the BIOS does is check the information stored in a tiny (64 bytes) amount of RAM located on a complementary metal oxide semiconductor (CMOS) chip.The CMOS Setup provides detailed information particular to your system and can be altered as your system changes.If the BIOS finds any errors during the POST, it will notify you by a series of beeps or a text message displayed on the screen.

The BIOS will try to initiate the boot sequence from the first device.It checks the PS/2 ports or USB ports for a keyboard and a mouse.It looks for a peripheral component interconnect (PCI) bus and, if it finds one, checks all the PCI cards.Since the BIOS is constantly intercepting signals to and from the hardware, it is usually copied, or shadowed, into RAM to run faster.Whenever you turn on your computer, the first thing you see is the BIOS software doing its thing, which is the Power On Self Test, shortened to POST.

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