BIOS (Basic Input-Output System) is a very important interface between the PC hardware and operating system, and hardware control program to burn in the memory component.Hardware assembling together, unable to contact each other just a bunch of parts, parts to be able to communicate with each other, communication and coordination, in order to constitute the basis of the overall "system", the BIOS will play this role. When the power is turned on, before entering the operating system (such as DOS, Unix, Windows), the the computer first important work is to perform a BIOS program, so that the operation to become the basis of the "system", and at the same time to check the computer peripherals between hardwareIs it normal. It served as the initial hardware setup and testing of the role, to ensure the normal operation of the hardware, the BIOS will read the hard disk boot program is completed, and then hand over control of the software operating system. If the adverse hardware, BIOS will pause call the operating system, inform the user, and the problem and propose amendments in the screen display.If the display card has not been set, the BIOS will also use the frequency of the beep to remind users not find specific hardware problems. If we are to enter the BIOS Setup Menu, users can boot on the computer and have not yet entered the middle of the operating system neutral, press the button screen prompts to enter the BIOS setup screen, which can modify the date, time, and hardwarefine-tune the value, power saving level, host or peripheral equipment settings, and so on. Important interface between the BIOS is the operating system as well as a host of hardware, such as display card BIOS (VGA BIOS), containing the control program, product identification messages, these messages are generally burned in ROM or Flash chip inside the graphics card manufacturers directly, plays an intermediary between the operating system and graphics card and coordinating functions. BIOS burn in read-only memory (ROM), even if the computer is powered down, the data will not disappear, but the past can not be written to modify the limitations. Currently burning in flash memory (Flash) BIOS components can be modified to change the setting, with Dual BIOS new applications. Dual BIOS on the new motherboard, in order to prevent the user to update the BIOS failure, may be a correct BIOS data immediately copied back to the original BIOS design, thus avoiding the user can not boot, but also sent back to the factory for repair distress. BIOS appearance of it looks somewhat like hardware, happens to have the characteristics of the software. Through the computer to run the application, it can upgrade to a newer version, and usually operates only basic information only. This can not be classified into hardware or software components, the IT sector is generally called "firmware (Firmware). In addition to the computer's BIOS with firmware features, the modem DSP digital signal processor is one of them, so when users want to upgrade the modem version, by downloading a new program to complete the upgrade process. AMIBIOS is one of the oldest of the BIOS chip, is probably the most widely used PC. American Megatrends AMIBIOS headquartered in Norcross, Georgia City production.