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The device drivers are other pieces of software that identify the base hardware components such as keyboard, mouse, hard drive and floppy drive.

For example, when you press a key on your keyboard, the signal is sent to the keyboard interrupt handler, which tells the CPU what it is and passes it on to the operating system. Interrupt handlers are small pieces of software that act as translators between the hardware components and the operating system. We will talk more about these settings later. The BIOS uses this information to modify or supplement its default programming as needed. The CMOS Setup provides detailed information particular to your system and can be altered as your system changes. 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. Initialize registers and power management.Load the interrupt handlers and device drivers.Check the CMOS Setup for custom settings.