BIOS

关于BIOS的简介与相关内容。

BIOS

Edited based on an article from Wikipedia

In IBM PC compatible computers, the Basic Input/Output System (BIOS), also known as the system BIOS or ROM BIOS (/ ba .o s/), is a de facto standard defining a firmware interface. The name originated from the Basic Input Output System used in the CP/M operating system (released in 1976), where the BIOS was loaded from disk, with only a small boot loader program stored in read-only memory.

The BIOS software is built into the PC, and is the first code run by a PC when powered on ('boot firmware'). When the PC starts up, the first job for the BIOS is the power-on self-test, which initializes and identifies system devices such as the CPU, RAM, video display card, keyboard and mouse, hard disk drive, optical disc drive and other hardware. The BIOS then locates boot loader software held on a peripheral device (designated as a 'boot device'), such as a hard disk or a CD/DVD, and loads and executes that software, giving it control of the PC. This process is known as booting, or booting up, which is short for bootstrapping.

BIOS software is stored on a non-volatile ROM chip on the motherboard. It is specifically designed to work with each particular model of computer, interfacing with various devices that make up the complementary chipset of the system. In modern computer systems, the BIOS chip's contents can be rewritten without removing it from

the motherboard, allowing BIOS software to be upgraded in place.

Award BIOS setup utility on a standard PC

A BIOS has a user interface (UI), typically a menu system accessed by pressing a certain key on the keyboard when the PC starts. In the BIOS UI, a user can:

configure hardware set the system clock enable or disable system components select which devices are eligible to be a potentialboot device

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