The BIOS is built-in software that contains generic code required to control the keyboard, display screens, disk drives and other functions. The primary purpose of the BIOS is to set up hardware and further load and start an operating system. BIOS is placed in a nonvolatile ROM chip inside the computer, ensuring the availability of BIOS at all times and preventing accidental disk failure. The BIOS checks every hardware connection and locates the devices, after which the operating system is loaded into computer memory.
Every motherboard manufacturer produces a different BIOS. Because different motherboards contain different hardware architectures, the BIOS needs to be customized for that particular set of hardware. When there are hardware problems, the BIOS will display a set of error codes to give the user information about the specific hardware. BIOS is also used to identify and configure the hardware in a computer such as the hard drive, floppy drive, optical drive, CPU, memory, etc
Here are some common things you can do in most BIOS systems
1. View Amount of Memory Installed
2. Setting the system clock
3. Enabling and disabling certain system components
4. Hardware configuration
5. Selecting boot drives
6. Set password prompts for secured access to BIOS user interface function
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