What is the BIOS and what is the function?

the role of BIOS :

The BIOS can be a cornerstone of computer startup and operation. The computer failures and BIOS settings that we often see are closely related. For example, your BIOS simply does not recognize some new hardware or is not fully supported for the current operating system. In this case, the issue can only be resolved if the BIOS is reset or the BIOS is upgraded. In addition, if you want to increase the boot speed, you also need to make some adjustments to the BIOS to achieve the purpose, such as adjusting the hardware boot sequence, reduce the startup of the detection project and so on.

Believe that often use the computer's friends must have heard the bios of the word, but many people do not know what Bois is, the BIOS is a set of hardware computer programs, saved on the motherboard of a ROM chip. Unlike CMOS, CMOS is a read-write RAM chip on the motherboard of a computer, which is used to save the hardware configuration of the current system and the user's settings for certain parameters. The CMOS chip is powered by a rechargeable battery on the motherboard, and the parameters are not lost even if the system is powered off. CMOS chip only save the function of the data, the parameters of the CMOS changes to be through the BIOS setup program to achieve, so we say Bois is the cornerstone of the computer. Let's go over the details with the small series.

First of all, strictly speaking, the BIOS is not a real word, but a four-word acronym, they are bois= basic input/output system, which means the basic input and output systems, the full name is Rom-bois, is read-only memory basic input/ The abbreviation of the output system, the Setup program is a set of programs that are cured to the CMOS chip on the computer motherboard, its main function is to provide the lowest level, the most direct hardware setting and control for the computer. In layman's terms, Bois is a "translator" or interface between hardware and software programs (although it is only a program), which is responsible for the immediate requirements of hardware and the implementation of hardware-specific operational requirements. The BIOS can only be set up at boot time, mainly on the basic input and output system of skills management and settings, so that the system runs in the best state, using the BIOS setup program can be used to troubleshoot the system or diagnose system problems.

Bois is a software system that is included in the system that determines the basic function of a machine before it has access to the program on the disk. So what is bois for a PC? It contains code that controls the keyboard, display screen, disk drive, serial communication device, and many other features. Generally BOIS is stored on the motherboard of the ROM chip (so usually called Rom BOIS), to ensure the general availability of BOIS and will not be damaged due to disk errors. It also ensures that the machine can be started. Because RAM is faster than ROM, many machine manufacturer-designed Bois can be copied from ROM to ram to run when the machine starts, and this technique is called shadowing. Today, in many PCs is the Flash BOIS, thought that this BOIS is stored in the rewritable flash memory chip, if necessary rewrite effortlessly.

What is the BIOS and what is the function?