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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 8: Motherboards

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What is CMOS?
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What is POST?
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What is BIOS?

BIOS stand for Basic Input/Output Services and are a specialized program that resides on a ROM or Read Only Memory chip mounted on the motherboard. If CMOS keeps track of hardware on the computer that is changeable, BIOS holds numerous small programs for computer hardware that is considered permanent. Examples of permanent hardware are keyboards, serial and parallel ports,

Strictly speaking, BIOS that can be flashed is not stored on ROM but on EEPROM which stands for Electrically Erasable Programmable Read Only Memory. This type of memory is still mostly “read only” but can be erased and written to under specific circumstances. This means not throwing the baby out with the bath water or in other words, you do not have to get rid of the motherboard when you get rid of the old BIOS.

BIOS Upgrades

Originally, it was impossible to upgrade BIOS. If you needed upgraded BIOS, you needed a new computer or at least a new motherboard. Today it is possible to “flash” BIOS and to upgrade it. BIOS upgrades can be downloaded across the Internet from a motherboard or computer manufacturer’s site. Since BIOS is programming (software) and device (hardware) linked together, it is commonly known as “firmware”. If it becomes necessary to repair or replace a motherboard, it would be advisable to upgrade the BIOS at the same time. If not, the computer may not work at all or work only with limited functionality. A motherboard with BIOS that needs to be upgraded may not be able to apply other software upgrades such as device drivers.



Previous Topic/Section
What is CMOS?
Previous Page
Pages in Current Topic/Section
1
Next Page
What is POST?
Next Topic/Section

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