Chapter 4. Bios Setup - Abit BG-71 User Manual

BIOS Setup 4-1

Chapter 4. BIOS Setup

The BIOS is a program located on a Flash Memory chip on the motherboard. This program
will not be lost when you turn the computer off. This program is also referred to as the boot
program. It is the only channel the hardware circuit has to communicate with the operating
system. Its main function is to manage the setup of the motherboard and interface card
parameters, including simple parameters such as time, date, hard disk drive, as well as more
complex parameters such as hardware synchronization, device operating mode, and setup of
CPU speed. The computer will operate normally, or will operate at its best, only if all of these
parameters are correctly configured through the BIOS.
Don't change the parameters inside the BIOS unless you fully understand their
meanings and consequences: The parameters inside the BIOS are used to setup the hardware
synchronization or the device-operating mode. If the parameters are not correct, they will
produce errors, the computer will crash, and sometimes you will not even be able to boot the
computer after it has crashed. We recommend that you do not change the parameters inside
the BIOS unless you are very familiar with them. If you are not able to boot your computer
anymore, please refer to the description of JP1 "CMOS Memory Clearing Header" in
Chapter 3.
When you start the computer, the BIOS program controls it. The BIOS first operates an
auto-diagnostic test called POST (Power On Self Test) for all of the necessary hardware. It
then configures the parameters of the hardware synchronization, and detects all of the
hardware. Only when these tasks are completed does it give up control of the computer to the
next level, which is the operating system (OS). Since the BIOS is the only channel for
hardware and software to communicate, it is the key factor for system stability, and in
ensuring that your system performs at its best. After the BIOS has achieved the
auto-diagnostic and auto-detection operations, it will display the following message:
PRESS DEL TO ENTER SETUP
The message will be displayed for three to five seconds, if you press the <Del> key, you will
access the BIOS Setup menu. At that moment, the BIOS will display the following screen:
Figure 4-1. CMOS Setup Utility
User's Manual