What is BIOS?

BIOS is the abbreviation of "Basic Input Output System" in English, and its Chinese name is "basic input output system" after literal translation. In fact, it is a set of programs solidified on a ROM chip of the computer motherboard, which stores the most important basic input and output programs of the computer, system setup information, self-checking programs after startup and system self-startup programs. Its main function is to provide the lowest and most direct hardware setting and control for the computer.

The extended data term BIOS (basic input and output system) was originally invented by gary kildall and first appeared in the CP/M operating system of 1975. Describes the hardware directly loaded by the interface when the machine-specific part of CP/M is started. There is usually only a simple boot loader in the ROM of CP/M machine.

Multiple versions of MS-DOS, PC-DOS or DR-DOS all contain a file named "IO". SYS "，" IBMBIO。 COM”，《IBMBIO》。 SYS "or" DRBIOS SYS "； This file is the so-called "DOSBIOS" (also known as "DOS I/O system"), which contains the specified part of the underlying hardware of the operating system. It is unique to the underlying hardware, but it is solidified in the "system BIOS" of ROM independent of the operating system. * * * stands for "CP/M? BIOS .

By introducing PS/2 machine, IBM divides the system BIOS into real mode and protection mode. The real pattern part is providing and presenting.

Some operating systems, such as DOS, are backward compatible, so they are named "CBIOS" (for BIOS compatibility).

References:

Baidu encyclopedia -bios