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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0001:  Power Supplies - System Board
      9  VIII  BIOS

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VIII  BIOS
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EEPROM

After several improvements on this idea, today we have the Electrically Erasable Programmable Read Only Memory (EEPROM).

Now when you want to add something to a computer that isn't supported in BIOS, we simply electrically erase the old data, and insert new data to support your new toy. This process is called Flashing, or Flashing the BIOS.

[spacer]BIOS Lobotomy

The one small drawback to this process is this. Notice in the paragraph above, you must erase (completely) the old software code before you can add new code. If you either install the wrong set of code for your computer, or if you're really unlucky, lose power in the process, you have BIOS that is brain-dead.


Due to this 'little challenge', in addition to the fact that some viruses (destructive code) have been written to attack BIOS, motherboard manufacturers such as Gigabyte are looking at a second BIOS that backs up the first BIOS.

At this point, your computer has a 'personality' (the BIOS) and CMOS entries to tell it what it has.

It is time to review what happens when you first turn your computer on.


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