BIOS

BIOS (basic input/output system): 

BIOS (basic input/output system) is the program a personal computer's microprocessor uses to kick the computer system off after you turn it on. It also oversees data flow between the computer's operating system and connected devices, for example, the hard disk, video connector, keyboard, mouse and printer.

BIOS is an integral piece of your computer and comes with it when you bring it home. (In the operating system can either be pre-installed by the producer or vendor or installed by the client.) BIOS is a program that is made accessible to the microprocessor on an erasable programmable read-only memory (EPROM) chip. When you turn on your computer, the microprocessor passes control to the BIOS program, which is constantly located at a similar spot on EPROM.

When BIOS boots up (fires up) your computer, it first determines whether the entirety of the connections are set up and operational and afterward it loads the operating system (or key pieces of it) into your computer's random access memory (RAM) from your hard disk or diskette drive.

With BIOS, your operating system and its applications are liberated from having to comprehend precise details, (for example, equipment addresses) about the joined input/output devices. When the device details change, only the BIOS program should be changed. Sometimes this change can be made during your system arrangement. For any situation, neither your operating system or any applications you use should be changed.

Although BIOS is theoretically consistently the intermediary between the microprocessor and I/O device control information and data flow, in some cases, BIOS can orchestrate data to flow directly to memory from devices, (for example, video cards) that require quicker data flow to be effective.