J&W JW-A880GMT-EXTREME, User Manual

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 AMD Series                                                                                                 User's Manual

Chapter 4 BIOS Setup Utility

BIOS stands for Basic Input and Output System. It was once called ROM BIOS when it was 

stored in a Read-Only Memory (ROM) chip. Now manufacturers would like to store BIOS in 

EEPROM which means Electrically Erasable Programmable Memory. BIOS used in this series 

of mainboard is stored in EEPROM, and is the first program to run when you turn on your 

computer.

BIOS performs the following functions:

1. Initializing and testing hardware in your computer (a process called "POST", for Power On        

    Self Test).

2. Loading and running your operating system.

3. Helping your operating system and application programs manage your PC hardware by      

    means of a set of routines called BIOS Run-Time Service.

4.1 About BIOS Setup

    BIOS Setup is an interactive BIOS program that you need to run when:

    1. Changing the hardware of your system. (For example: installing a new Hard Disk etc.)

    2. Modifying the behavior of your computer. (For example: changing the system time or date,  

        or turning special features on or off etc.)

    3. Enhancing your computer's behavior. (For example: speeding up performance by turning 

        on shadowing or cache)

4.2 To Run BIOS Setup

    First access BIOS setup menu by pressing <F1> key after “POST” is complete (before OS is     

    loaded). After the first BIOS be setupped(or loaded default values) and save, the <DEL> key 

    will be pressed if you will enter BIOS setup menu.
                                                    

4.3 About CMOS

    CMOS is the memory maintained by a battery. CMOS is used to store the BIOS settings you 

    have selected in BIOS Setup. CMOS also maintains the internal clock. Every time you turn 

    on your computer, the BIOS Looks into CMOS for the settings you have selected and 

    configures your computer accordingly. If the battery runs out of power, the CMOS data will 

    be lost and POST will issue a “CMOS invalid” or “CMOS checksum invalid” message. If this 

    happens, you have to replace the battery and check and configure the BIOS Setup for the 

    new start.

4.4 The POST (Power On Self Test)

    POST is an acronym for Power On Self Test. This program will test all things the BIOS does 

    before the operating system is started. Each of POST routines is assigned a POST code, a 

    unique number which is sent to I/O port 080h before the routine is executed.