User:Azuriteking

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BIOS (basic input/output system)

-starts operating when computer boots -is in control throughout boot process -it runs off:


PROM (programmable read-only memory)

digital memory in which bits (1 or 0) are locked permanently by fuses or antifuses. They store settings permanently. The bits are typically all 1. However, the fuses for each one can be blown, changing them to zero, or vice versa for the antifuse. When connection is open, it's a 0. When closed, it's a 1.


EPROM (erasable PROM)

ROM memory. Can be erased using a strong UV light.

-it may perform a 'power-on self-test' (POST), and then decompress from BIOS memory onto main system memory if all is going well.

-user can manipulate BIOS to select which devices to boot first. (ex: HD, CDROM, FD)

-user may also boot a different OS, usually from a second HD

-older BIOS chips were strictly ROM. Newer ones are not EEPROM or flash BIOS chips which can be reprogrammed.

-in case of faulty programming by user to a BIOS chip, some motherboards have a back-up BIOS (Dual BIOS boards)

-while the motherboard has the main BIOS chips for vital system processes, adapter cards may have their own BIOS chips.

            • CMOS******

-CMOS (complementary metal-oxide semiconductors) are ICs

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