BIOS stands for Basic Input/Output System. This is software usually housed on a read-only memory chip somewhere on your computer's motherboard(some computers today… have chips which are not read-only, where the BIOS can be modified). BIOS is where information on your floppy and hard drives are kept, including which drive to boot-up first, when you turn on the computer..
You can usually access it by hitting the delete, F1, F2, or F3 key, before your OS loads (this varies depending on your computer's manufacturer and model). However, if you're not computer savy, then stay out of your computer's BIOS! You could wreak major havoc..
1. BIOS Defined: Basic, input/output, System. Provides basic functionality to boot up the computer .
2. BIOS Main purpose: Is to load Drivers for basic operation of your computer (Mouse driver, Keyboard driver, Video driver) so on..
3. BIOS is Stored: Read only memory (ROM).
4. Changes to BIOS are saved: CMOS.
5. CMOS: Complementary metal oxide semiconductor. This CMOS retains its memory when power is off(watch battery).
BIOS manages .
Â· POST: power on self test (Test for video, CPU, memory, and checks Power supply) .
Â· BOOT: Looks for 1. ( MBR) Master Boot Record (on a disk) 2. First physical sector on bootable volume (VBR) 3. Startup file (NT) NT loader ---(NTLDR) .
Â· ERRORS .
Â· Locates additional ROM BIOS (Video card BIOS)(SCSI Device BIOS) .
The BIOS is boot firmware, designed to be the first code run by a PC when powered on. The initial function of the BIOS is to identify, test, and initialize system devices such as the video display card, hard disk, and floppy disk and other hardware. This is to prepare the machine into a known state, so that software stored on compatible media can be loaded, executed, and given control of the PC. This process is known as booting, or booting up, which is short for bootstrapping. BIOS programs are stored on a chip and are built to work with various devices that make up the complementary chipset of the system. They provide a small library of basic input/output functions that can be called to operate and control the peripherals such as the keyboard, text display functions and so forth. In the IBM PC and AT, certain peripheral cards such as hard-drive controllers and video display adapters carried their own BIOS extension ROM, which provided additional functionality. Operating systems and executive software, designed to supersede this basic firmware functionality, will provide replacement software interfaces to applications. ( Full Answer )