Sunday, February 24, 2008

BIOS Snippet


1)Do u know how the system clock works correctly even though we on and off our system??Read on to know..
Open the CPU and look at the motherboard.You will find a coin like Silver battery(3V).This battery is responsible for 24 x 7 Power Supply for BIOS(BASIC INPUT-OUTPUT SYSTEM and pronounced "bye-ose") and is also responsible for functioning of System Clock.
On virtually every computer available, the BIOS makes sure all the other chips, hard drives, ports and CPU function together.The main function of BIOS is to load the booting process of the Operating System when power is switched on.
When you turn on your computer, the BIOS does several things. This is its usual sequence:
1. Check the CMOS(Complete Metal-Oxide Semiconductor) Setup for custom settings
2.Load the interrupt handlers and device drivers
3.Initialize registers and power management
4.Perform the power-on self-test (POST)
5.Display system settings
6.Determine which devices are bootable
7.Initiate the bootstrap sequence
The first thing the BIOS does is check the information stored in a tiny (64 bytes) amount of RAM located on a complementary metal oxide semiconductor (CMOS) chip. The CMOS Setup provides detailed information particular to your system and can be altered as your system changes. The BIOS uses this information to modify or supplement its default programming as needed.
Interrupt handlers are small pieces of software that act as translators between the hardware components and the operating system.The Device drivers are other pieces of software that identify the base hardware components such as keyboard, mouse, hard drive and floppy drive. Since the BIOS is constantly intercepting signals to and from the hardware, it is usually copied, or shadowed, into RAM to run faster.
2)If you forgot the password set for BIOS,then just remove the battery from motherboard for about 30sec and place it back on the motherboard.Now it won't prompt for a password.

1 comment:

santosh said...

hey vijay...ur blog is nice man. plz do update the latest info u get reg many technical things. thnx for ur info