What is BIOS?
Bios stand for basic input and output system is a small software up to 1MB or 2
MB that is always loaded in ROM chip, ROM is a type of memory which couldn`t be
altered or changed, Bios is a program that monitor all the functions of
computer and load the operating system from hard disk or from floppy disk to
RAM, Bios conducts various operations described below
POST (Power On Self Test) Power On Self Test is the first
instruction executed during start-up. It checks the PC components and that
everything works.
You
can recognize it during the RAM test, which occurs as soon as you turn power
on. The post tests the processor
Check
the Bios
Check
the CMOS configuration (CMOS Setup or Bios Setup)
Initializing
the timer (internal clock)
Checking
RAM and Cache Memory
Installing
all BIOS functions
Initializing
DMA controller
If
POST detects any error it displays an error message or emits the sequence of
Beeps(short sound). Or send a post code to the computer serial port which can
be retrieved by using special diagnostic hardware.
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