COMPUTER BIOS
- BIOS or the basic input/output system is a de facto standard defining a firmware interface.
- The BIOS is built into the computer and is the first code run by the computer when it is switched on. The key role of the BIOS is to load and start the operating system.
- When the computer starts, the first function that BIOS performs is to initialize and identify system devices such as the video display card, keyboard and mouse, hard disk, CD/DVD drive and other hardware. In other words, the code in the BIOS chip runs a series of tests called POST (Power On Self Test) to ensure that the system devices are working correctly.
BIOS performs the following functions:
- Initializes the system hardware
- The BIOS MenuInitializes system registers
- Initializes power management system
- Tests RAM
- Test all the serial and parallel ports
- Initializes floppy disk drive and hard disk controllers
- Displays system summary information
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