Abit BF6 User Manual

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Introduction of the BIOS




function by pressing the F1 key in any menu in the BIOS.

!Press F5 to reset current screen settings to their Setup Default values.

!Press F6 to return to theFail-Safe Default setting i.e. if you use the wrong settings causing a system boot failure, use this function key to quickly return to the system default settings.

!Press F7 to quickly set the system to theOptimized Defaults setting.

In some setup menu screens, you can see the scroll bar on the right side of the window. You can use the ) and* keys or the up and down arrow keys to scroll the screen to view more help information or functions to select.

You may see the right cursor symbol appear on the left side of some items, indicating that additional information or options can be select in a Sub-Menufor this item.


The item heading in the square outlet represents the default setting for that field

Computer Knowledge: CMOS Data

Maybe you have heard of someone losing CMOS DATA. What is the CMOS? Is it important? CMOS is the memory in which the BIOS parameters that you have configured are stored. This memory is passive, you can both read its data, and store data in it. But this memory has to be powered by a battery in order to avoid data loss when the computer is turned off. If the CMOS battery dies, you will loose all CMOS data. We therefore recommend that you write down all the parameters of your hardware, or you put a label with these parameters on your hard disk.

User’s Manual





3-1.SoftMenu III Setup

The CPU can be setup through a programmable switch (CPU SOFT MENUIII), that replaces the traditional manual hardware configuration. This feature allows the user to more easily complete the installation procedures. You can install the CPU without configuring any jumpers or switches. The CPU must be setup according its specifications.

Figure 3-2.CPU Soft MenuTM III Screen Shot

System Processor Type:

Intel Pentium III MMX

Intel Pentium II MMX

Intel Celeron MMX

CPU Operating Frequency:

This option sets the CPU speed.

In this field, the CPU speed is indicated like this: CPU speed = External clock * Multiplier factor, select the CPU speed according the type and the speed of your CPU.

For Intel Pentium II and CeleronPPGA MMX processors, you can choose the following settings:


Introduction of the BIOS















233 (66)





333 (66)

300 (100)

350 (100)







































User Define








CPU bus speed above 66MHz/100MHz supported but not guaranteed due to the PCI and chipset specs.

User defined external clock and multiplier factor:

User Defined:

When you choose the User Define, you will be able to set the following five items.

!!!! Warning !!!!

The wrong settings of the multiplier and external clock in certain circumstances may cause CPU damage. Setting the working frequency higher than the PCI chipset or processor specs, may cause abnormal memory module functioning, system hangs, hard disk drive data lose, abnormal functioning of the VGA card, or abnormal functioning with other add-oncards. Usingnon-specificationsettings for your CPU is not the intention of this explanation. These should be used for engineering testing, not for normal applications.

If you use non-specificationsettings for normal operation, your system may not be stable, and may effect system reliability. Also, we do not guarantee the stability and compatibility for settings that are not within specification, and any damage of any elements on the motherboard or peripherals, is not our responsibility.

CPU FSB Clock:




66MHz (1/2)

75MHz (1/2) *

83MHz (1/2)*


84Mhz ~ 200MHz











CPU bus speed above 66MHz/100MHz supported but not guaranteed due to the PCI and chipset specs.

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Multiplier Factor:

You can choose the following multiplier factors:

x 2

x 2.5

x 3

x 3.5 x 4 x 4.5 x 5 x 5.5 x 6

x 6.5

x 7

x 7.5

x 8

SEL100/66# Signal

Two options are available: Default and Low. The default setting is “Default”.

PCI Clock/CPU FSB Clock

Three options are available: 1/2, 1/3 and 1/4. This item lets you set the PCI clock. It correlates with the CPU FSB clock you set. For example, if you set the CPU FSB clock to 100MHz and choose 1/3 here, the PCI clock will be 33.3 MHz.

AGP Clock/CPU FSB Clock

Two options are available: 1/1 and 2/3. This item lets you set the AGP clock. It correlates with the CPU FSB clock you set. The default setting is “1/1”. In this case, the AGP clock will equal to the CPU FSB clock. If you choose “2/3”, the AGP clock will be the CPU FSB clock divided by 3 and times 2. Generally, if you set the CPU FSB clock to 66MHz, you ought to select “1/1”. If you set the CPU FSB clock to 100Mhz or higher, you ought to select “2/3”.

AGP Transfer Mode

This function allows the user to determine the capability of the AGP device. Selecting “Default” gives optimized performance. The video driver will decide the data transfer mode automatically. If the CPU FSB clock exceeds 125MHz, setting AGP Transfer Mode to “Normal” will result in a more stable system.

CPU Core Voltage

This item lets you select the CPU core voltage manually. You can change values in the “CPU Core Voltage” option lists by using the arrow up and down keys.

!!!Warning !!!

You must check the CPU document to make sure your CPU core voltage before you want to adjust this item. Incorrect CPU core voltage settings in certain circumstances may cause CPU damage.

I/O Voltage

This item lets you select the voltage supplied to the DRAM, chipset and AGP. You can change values in the “I/O Voltage” option lists by using the arrow up and down keys.


Introduction of the BIOS




!!! Warning !!!

Using a higher voltage may result in the shortening of your computer components’ life. We strongly suggest you leave this item on default setting.

In-OrderQueue Depth

Two options are available: 1 and 8. This item lets you set cache buffer for CPU data processing. If you are not well acquainted with this item setting, please leave it on the default setting (8).

Level 2 Cache Latency:

Sixteen setting are available, Default, and 1 to 15. This item can let you adjust the processor L2 cache speed, the larger the value, the faster the L2 cache will run. You have to be aware that if you set the L2 cache speed too fast, it will cause the L2 cache to fail. If the L2 cache fails it will cease to run until you reset the value, but the processor and L1 cache will still function, just not as well. To make sure your L2 cache functions properly please choose an appropriate setting. The default setting is


Normally, we do not recommend that you use the “User Define” option to setup CPU speed and multiplier factors This option is for setup of future CPUs whose specifications are still unknown. The specifications of all present CPUs are included in the default settings. Unless you are very familiar with all CPU parameters, it is very easy to make mistakes when you define the external clock and the multiplier factor by yourself.

Solution in case of booting problem due to invalid clock setup:

Normally, if the CPU clock setup is wrong, you will not be able to boot. In this case, turn the system off then on again. The CPU will automatically use its standard parameters to boot. You can then enter the BIOS Setup again and set up the CPU clock. If you can’t enter the BIOS setup, you must try turning the system on a few times (3~4 times) or press “INSERT“ key when turning on and the system will automatically use its standard parameters to boot. You can then enter BIOS SETUP again and set up the new parameters.

When you change your CPU:

This motherboard has been designed in such a way that you can turn the system on after having inserted a CPU in the socket without having to configure any jumpers or DIP switches. But if you change your CPU, normally you just have to turn off the power supply, change the CPU and then, set up the CPU parameters through SOFT MENUIII. However,if the new CPU is slower than the old one (and is same brand and type), we offer you two methods to successfully complete the CPU change operation.

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Method 1: Setup up the CPU for the lowest speed for its brand. Turn the power supply off and change the CPU. Then turn the system on again, and set up the CPU parameters through SOFT MENUIII.

Method 2: Since you have to open the computer case when you change the CPU, it could be a good idea to use the CCMOS jumper to erase the parameters of the original CPU and to enter BIOS Setup to set up CPU parameters again.


After setting up the parameters and leaving the BIOS SETUP, and having verified that the system can be booted, do not press the Reset button or turn off the power supply. Otherwise the BIOS will not read correctly, the parameters will fail and you must enter SOFT MENUIII again to set up the parameters all over again.

Spread Spectrum Modulated

For EMC (Electro-MagneticCompatibility Test) testing you maybe need to adjust this item for optimal results, we do not recommend you change the default, except for special reasons.


Introduction of the BIOS




3-2.Standard CMOS Features Setup Menu

This contains the basic configuration parameters of the BIOS. These parameters include date, hour, VGA card, FDD and HDD settings.

Figure 3-3.Standard CMOS Setup Screen Shot

Date (mm:dd:yy):

You can set the date in this item: month (mm), date (dd) and year (yy).

Time (hh:mm:ss):

You can set the time in this item: hour (hh), minute (mm) and second (ss).

IDE Primary Master / Slave and IDE Secondary Master / Slave:

These items have a sub-menuto let you choose further options. You can refer to the follow figure to check what options are available.

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Figure 3-4.IDE Primary Master Setup Screen Shot

+ IDE HDDAuto-Detection:

Press the Enter key for the BIOS to auto detect all detailed parameters of the hard disk drivers (HDD). If auto detection is successful, the correct values will be shown in the remaining items of this menu.


'A new IDE HDD must be first formatted, otherwise it can not read/write. The basic step in using a HDD is to make a HDD low-level format, then run FDISK, and then FORMAT the drive. Most current HDDs have already been subjected tolow-levelformat at the factory, so you can probably skip this operation. Remember though, the primary IDE HDD must have its partition set to active within the FDISK procedure.

(If you are using an old HDD that is already formatted, auto detection can not detect the correct parameters. You may need to do a low-levelformat or set the parameters manually, and then check if the HDD is working.

+IDE Primary Master:

Three settings are available: Auto, Manual and None. If you choose Auto, the BIOS will automatically check what kind hard disk you are using. If you want to set the HDD parameters yourself, make sure you fully understand the meaning of the parameters, and be sure to refer to the manual provided by the HDD manufacture to get the settings right.

+ Access Mode:

Since old operating systems were only able to support HDDs with capacities no bigger than 528MB, any hard disk with more than 528MB was unusable. AWARD BIOS features a


Introduction of the BIOS




solution to this problem: you can, according to your operating system, choose four operating modes: NORMAL , LBA, LARGE,Auto.

The HDD auto detection option in the sub-menuwill automatically detect the parameters of your hard disk and the mode supported.


Just let the BIOS detect your HDD access mode and make the decisions.

Normal mode:

Standard normal mode supports hard disks of up to 528MB or less. This mode directly uses positions indicated by Cylinders (CYLS), Heads, and Sectors to access data.

LBA (Logical Block Addressing) mode:

The earlier LBA mode can support HDD capacities of up to 8.4GB, and this mode uses a different method to calculate the position of disk data to be accessed. It translates Cylinders (CYLS), Heads and Sectors into a logical address where data is located. The Cylinders, Heads, and Sectors displayed in this menu do not reflect the actual structure of the hard disk, they are just reference values used to calculate actual positions. Currently, all high capacity hard disks support this mode, that’s why we recommend you use this mode. Currently, the BIOS can support the INT 13h extension function, enabling the LBA mode to support hard disk drive capacities exceeding 8.4GB.

Large Mode:

When the number of cylinders (CYLs) of the hard disk exceeds 1024 and DOS is not able to support it, or if your operating system does not support LBA mode, you should select this mode.

+ Capacity:

This item auto displays your HDD size. Note that this size is usually slightly greater than the size given by a disk checking program of a formatted disk.


All the items below are available when you set the item Primary IDE Master toManual.

+ Cylinder:

When disks are placed directly above one another along the shaft, the circular vertical "slice" consisting of all the tracks located in a particular position is called a cylinder. You can set the number of cylinders for a HDD. The minimum number you can enter is 0, the maximum number you can enter is 65536.

+ Head:

This is the tiny electromagnetic coil and metal pole used to create and read back the magnetic patterns on the disk (also called the read/write head). You can configure the

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number of read/write heads. The minimum number you can enter is 0, the maximum number you can enter is 255.

+ Precomp:

The minimum number you can enter is 0, the maximum number you can enter is 65536.


Setting a value of 65536 means no hard disk exists.

+ Landing Zone:

This is a non-dataarea on the disk's inner cylinder where the heads can rest when the power is turned off. The minimum number you can enter is 0, the maximum number you can enter is 65536.

+ Sector:

The minimum segment of track length that can be assigned to stored data. Sectors usually are grouped into blocks or logical blocks that function as the smallest units of data permit. You can configure this item to sectors per track. The minimum number you can enter is 0, the maximum number you can enter is 255.

Driver A & Driver B:

If you have installed the floppy disk drive here, then you can select the type of floppy drive it can support. Six options are available: None,360K, 5.25 in., 1.2M, 5.25in., 720K, 3.5 in., 1.44M, 3.5 in., 2.88M, 3.5 in.

Floppy 3 Mode Support:

Four options are available: Disabled , Driver A, Driver B,Both. The default setting isDisabled. 3 Mode floppy disk drives (FDD) are 3 1/2” drives used in Japanese computer systems. If you need to access data stored in this kind of floppy, you must select this mode, and of course you must have a 3 Mode floppy drive.


You can select the VGA modes for your video adapter, four options are available: EGA/VGA , CGA 40, CGA 80, MONO. The default setting is EGA/VGA.