BIOS

BIOS (Basic Input Output System)

-          Bios cheap is made of CMOS (complementary metal oxide semiconductor)

-          It used to detect all the components of computer or device/parts connected in to the computer.

-          Inside the BIOS, it has bios software and it cannot be change by users.

-          Through CMOS setup utility we can change some options of the BIOS software.

-          Normally to get inside bios is delete key and the following keys also used to get inside

  E.g. Intel m/b F1, F2

        IBMSYSTEM        F1

COMPAQ   F10

BIOS Software Company

1.       AWARD

2.       IBM

3.       INTEL

4.       AMIBIOS

5.       PHOONIX

BOOTING Steps of Computer

1.       Power on

It starts the process by covering the system on, sending current there are no problems & drive device. Assigning there are no problems with the power supply a especial wire called power good signal wire is charged and inform CPU to get up. The CPU than communication with the system rom and starts the power on.

2.       POST (Power on self-test)

-               The post is nothing but power on self-test, a computer literally discover & rediscover itself every time it powers up during this process computer parts test them self to know whether they are getting proper power supply or not.

-          During the post the system bios communicate with all essential hardware & takes them to identify them self. If any device fails to follow this identification routine it informs back to bios that it is facing problems than bios problem error codes called post error codes.

-          OR

-          After run (alert) the CPU, it test itself (self-test) the devices inside the computer is called post.

-          During detecting other devices, it will give error messages on beep code or numeric error code, if some problems on any device.