Asus P2B-F User manual

R
P2B-F
Pentium®II Motherboard
USER’S MANUAL

ASUS P2B-F User’s Manual
2
USER'S NOTICE
Product Name: ASUS P2B-F
Manual Revision: 1.00 E277
Release Date: October1998
No part of this manual, including the products and software described in it, may be repro-
duced, transmitted, transcribed, stored in a retrieval system, or translated into any language in
any form or by any means, except documentation kept by the purchaser for backup purposes,
without the express written permission of ASUSTeK COMPUTER INC. (“ASUS”).
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OR CONDITIONS OF MERCHANTABILITYOR FITNESS FORAPAR-
TICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS,
EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDEN-
TAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF
PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSI-
NESS AND THE LIKE), EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY
OF SUCH DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS MANUAL
OR PRODUCT.
Product warranty or service will not be extended if: (1) the product is repaired, modified or
altered, unless such repair, modification of alteration is authorized in writing byASUS; or (2)
the serial number of the product is defaced or missing.
Products and corporate names appearing in this manual may or may not be registered trade-
marks or copyrights of their respective companies, and are used only for identification or
explanation and to the owners’ benefit, without intent to infringe.
• Intel, LANDesk, and Pentium are registered trademarks of Intel Corporation.
• IBM and OS/2 are registered trademarks of International Business Machines.
• Symbios is a registered trademark of Symbios Logic Corporation.
• Windows and MS-DOS are registered trademarks of Microsoft Corporation.
• Sound Blaster AWE32 and SB16 are trademarks of Creative Technology Ltd.
• Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated.
The product name and revision number are both printed on the product itself. Manual revi-
sions are released for each product design represented by the digit before and after the period
of the manual revision number. Manual updates are represented by the third digit in the manual
revision number.
For previous or updated manuals, BIOS, drivers, or product release information, contactASUS
at http://www.asus.com.tw or through any of the means indicated on the following page.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FUR-
NISHED FOR INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT
ANY TIME WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COM-
MITMENT BY ASUS. ASUS ASSUMES NO RESPONSIBILITY OR LIABILITY FOR
ANYERRORS OR INACCURACIESTHATMAYAPPEARINTHIS MANUAL,INCLUD-
ING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Copyright © 1998 ASUSTeK COMPUTER INC. All Rights Reserved.

ASUS P2B-F User’s Manual 3
ASUS CONTACT INFORMATION
ASUSTeK COMPUTER INC.
Marketing
Address: 150 Li-Te Road, Peitou, Taipei, Taiwan 112
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support
Fax: [phone]
BBS: [phone]
Email: [email protected]
WWW: www.asus.com.tw
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER INTERNATIONAL
Marketing
Address: 6737 Mowry Avenue, Mowry Business Center, Building 2
Newark, CA 94560, USA
Fax: [phone]
Email: [email protected]
Technical Support
Fax: [phone]
BBS: [phone]
Email: [email protected]
WWW: www.asus.com
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER GmbH
Marketing
Address: Harkort Str. 25, 40880 Ratingen, BRD, Germany
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support
Hotline: [phone]
BBS: 49-2102-448690
Email: [email protected]
WWW: www.asuscom.de
FTP: ftp.asuscom.de/pub/ASUSCOM

ASUS P2B-F User’s Manual
4
CONTENTS
I. INTRODUCTION 7
How this Manual is Organized ........................................................... 7
Item Checklist ..................................................................................... 7
II. FEATURES 8
Features of the ASUS P2B-F Motherboard ........................................ 8
The ASUS P2B-F Motherboard .................................................. 11
III. INSTALLATION 12
Layout of the ASUS P2B-F Motherboard......................................... 12
Installation Steps............................................................................... 14
1. Jumpers ......................................................................................... 14
Jumper Settings ........................................................................... 15
2. System Memory (DIMM) ............................................................. 17
DIMM Memory Installation Procedures: .............................. 18
3. Central Processing Unit (CPU)................................................... 19
Pentium II Processor.............................................................. 19
AAVID Heatsink ................................................................... 23
Elan Vital Heatsink ................................................................ 23
4. Expansion Cards ........................................................................... 24
Expansion Card Installation Procedure ................................. 24
Assigning IRQs for Expansion Cards.................................... 24
Assigning DMA Channels for ISA Cards.............................. 25
ISA Cards and Hardware Monitor ......................................... 25
5. External Connectors..................................................................... 26
Power Connection Procedures .......................................................... 33
IV. BIOS SOFTWARE 34
Flash Memory Writer Utility ............................................................ 34
Main Menu .................................................................................. 34
Managing and Updating Your Motherboard’s BIOS................... 36
6. BIOS Setup .................................................................................. 37
Load Defaults ........................................................................ 38
Standard CMOS Setup ................................................................ 38
Details of Standard CMOS Setup:......................................... 38
BIOS Features Setup ................................................................... 41
Details of BIOS Features Setup............................................. 41
Chipset Features Setup ................................................................ 44
Details of Chipset Features Setup.......................................... 44

ASUS P2B-F User’s Manual 5
CONTENTS
Power Management Setup........................................................... 47
Details of Power Management Setup .................................... 47
PNP and PCI Setup ..................................................................... 50
Details of PNP and PCI Setup ............................................... 50
Load BIOS Defaults .................................................................... 52
Load Setup Defaults .................................................................... 52
Supervisor Password and User Password ................................... 53
IDE HDD Auto Detection ........................................................... 54
Save & Exit Setup ....................................................................... 55
Exit Without Saving .................................................................... 55
V. SUPPORT CD 56
ASUS Smart Motherboard Support CD............................................ 56
Desktop Management Interface (DMI)............................................. 57
Introducing the ASUS DMI Configuration Utility................ 57
System Requirements ............................................................ 57
Using the ASUS DMI Configuration Utility ......................... 58
VI. ASUS LAN Card 61
ASUS PCI-L101 Fast Ethernet Card ................................................ 61
Features ............................................................................................. 62
Software Driver Support ............................................................. 62
Question and Answer .................................................................. 62

ASUS P2B-F User’s Manual
6
FCC & DOC COMPLIANCE
FederalCommunications CommissionStatement
This device complies with FCC Rules Part 15. Operation is subject to the following
two conditions:
• This device may not cause harmful interference, and
• This device must accept any interference received, including interference that
may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installa-
tion. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with manufacturer's instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the inter-
ference by one or more of the following measures:
• Re-orient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which
the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
WARNING! The use of shielded cables for connection of the monitor to the
graphics card is required to assure compliance with FCC regulations. Changes
or modifications to this unit not expressly approved by the party responsible for
compliance could void the user's authority to operate this equipment.
CanadianDepartment ofCommunicationsStatement
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus set out in the Radio Interference Regulations of the Cana-
dian Department of Communications.

ASUS P2B-F User’s Manual 7
I. INTRODUCTION
I. INTRODUCTION
Manual / Checklist
How this Manual is Organized
This manual is divided into the following sections:
I. Introduction: Manual information and checklist
II. Features: Information and specifications concerning this product
III. Installation: Instructions on setting up the motherboard and jumpers
IV. BIOS Software: Instructions on setting up the BIOS software
V. Support CD: Information on the included support software
Item Checklist
Please check that your package is complete. If you discover damaged or missing
items, please contact your retailer.
(1) ASUS Motherboard
(1) Pentium II Retention mechanism
(1) IDE ribbon cable for master and slave drives
(1) Floppy ribbon cable for (1) 5.25inch floppy and (2) 3.5inch floppies
(1) Bag of spare jumper caps
(1) Support CD with drivers and utilities
(1) Motherboard User’s manual
Infrared module (optional)
ASUS PCI-L101 Wake-On-LAN 10/100 Ethernet Card (optional)

8 ASUS P2B-F User’s Manual
Features of the ASUS P2B-F Motherboard
The ASUS P2B-F is carefully designed for the demanding PC user who wants ad-
vanced features processed by the fastest CPU.
Specifications:
•Multi-Speed: Supports Intel Pentium
®
II (233MHz to 450MHz) and Celeron
TM
(266MHz and faster) processors.
•Intel AGPset: Features Intel’s 440BX AGPset with I/O subsystems and front-side
bus(FSB)platform,whichbooststhetraditional66-MHzinternalbusspeedto100MHz.
•Multi-Cache:Supports processors with either 0, 128, or 512KB Pipelined Burst
Level 2 cache.
•PC100 Memory Support: Equipped with four DIMM sockets to support Intel
PC100-compliant SDRAMs (8, 16, 32, 64, 128, or 256MB) up to 1024MB.These
new SDRAMs are necessary to meet the critical enhanced 100MHz bus speed
requirement.
•Peripheral Wake Up: Supports modem wake up, keyboard wake up, and LAN
card wake up functions from sleep or soft-off mode.
•PC Health Monitoring: Provides an easier way to examine and manage system
status information such as system voltage, temperature, and fan status.
•AGPSlot:SupportsAGPgraphics cards for high performance, component level
interconnect targeted at 3D graphical display applications.
•SB-Link™: Features Creative’s SB-Link™, allowing SB16 compatibility, us-
ing Intel’s PC-PCI DMA and serialized IRQ protocols, to AWE64D or compat-
ible PCI audio cards.
•SMBus:Features the System Management Bus interface, which is used to physi-
cally transport commands and information between SMBus devices.
•PCI & ISA Expansion Slots: Provides five 32-bit PCI and two 16-bit ISA slots.
One ISA slot is shared with a PCI slot.
•Super Multi-I/O: Provides two high-speed UART compatible serial ports and
oneparallel port with EPPandECPcapabilities.UART2 can also bedirectedfrom
COM2 to the Infrared Module for wireless connections.
•Ultra DMA/33 Bus Master IDE: Comes with an onboard PCI Bus Master IDE
controllerwithtwoconnectorsthatsupportfour IDEdevicesintwochannels,supports
UltraDMA/33, PIO Modes 3 and 4 and Bus Master IDE DMA Mode 2, and supports
Enhanced IDE devices, such as Tape Backup and CD-ROM, and LS-120 drives.
•Wake-On-LAN Header: Supports Wake-On-LAN activity with special net-
work cards, such as the ASUS PCI-L101 10/100 Fast Ethernet PCI card.
II. FEATURES
Specifications
II. FEATURES

ASUS P2B-F User’s Manual 9
Special Features:
•Enhanced ACPI andAnti-Boot Virus BIOS: Features a programmable BIOS, of-
fering enhanced ACPI for Windows 98 compatibility, built-in firmware-based virus
protection through Trend ChipAway Virus codes, and autodetection of most de-
vices for virtually automatic setup.
• Desktop Management Interface (DMI): Supports DMI through BIOS, which
allows hardware to communicate within a standard protocol creating a higher
level of compatibility. (Requires DMI-enabled components.)
• Easy Installation: Incorporates BIOS that supports autodetection of hard disk
drives, PS/2 mouse, and Plug and Play devices to make the setup of hard disk
drives, expansion cards, and other devices virtually automatic.
• PC’98 Compliant: Both the BIOS and hardware levels ofASUS smart series of
motherboards meet PC’98 compliancy. The new PC’98 requirements for sys-
tems and components are based on the following high-level goals: Support for
Plug and Play compatibility and power management for configuring and man-
aging all system components, and 32-bit device drivers and installation proce-
dures for Windows 95/98/NT.
•Symbios SCSI BIOS: Supports optional ASUS SCSI controller cards through
onboard SYMBIOS firmware.
Performance Features:
•Concurrent PCI: Concurrent PCI allows multiple PCI transfers from PCI mas-
ter busses to the memory and processor.
• Double the IDE Transfer Speed: ASUS smart series motherboards with Intel
chipsets improves IDE transfer rate using Bus Master UltraDMA/33 IDE which
can handle data transfer up to 33MB/s. The best of all is that this new technol-
ogy is compatible with existingATA-2 IDE specs so there is no need to upgrade
current hard drives or cables.
• SDRAMOptimizedPerformance: Supportsthenewgenerationmemory - Syn-
chronous Dynamic RandomAccess Memory (SDRAM) which increases the data
transfer rate from 528MB/s max using EDO memory to 800MB/s max using
SDRAM.
II. FEATURES
II. FEATURES
Specifications

10 ASUS P2B-F User’s Manual
II. FEATURES
Specifications
II. FEATURES
Intelligent Features:
• Auto Fan Off: The system fans will power off automatically even in sleep
mode.This function reduces both energy consumption and system noise, and is
an important feature in implementing silent PC systems.
• Dual Function Power Button: Pushing the power button for less than 4 sec-
onds when the system is in the working state places the system into one of two
states: sleep mode or soft-off mode, depending on the BIOS setting (see “Power
Management Setup” under IV. BIOS SOFTWARE). When the power button is
pressed for more than 4 seconds, the system enters the soft-off mode regardless
of the BIOS setting.
• Fan Status Monitoring and Alarm: To prevent system overheat and system
damage, the CPU fan and system fans can be monitored for RPM and failure.
Each fan can be set for its normal RPM range and alarm thresholds.
• Keyboard Power Up: Keyboard Power Up can be enabled or disabled to allow
the computer to be powered on by pressing the space bar on the keyboard.
• Message LED (requiresACPI OS support): Turbo LEDs now act as informa-
tion providers. Through the way a particular LED illuminates, the user can de-
termine the stage the computer is in.Asimple glimpse provides useful informa-
tion to the user.
• Remote Ring On (requires external modem): This allows a computer to be
turned on remotely through an external modem. With this benefit on-hand, any
usercanaccessvitalinformationfromtheircomputerfrom anywhere in the world!
• System Resources Alert: Today’s operating systems such as Windows 95/98/
NT and OS/2, require much more memory and hard drive space to present enor-
mous user interfaces and run large applications. The system resource monitor
will warn the user before the system resources are used up to prevent possible
application crashes. Suggestions will give the user information on managing
their limited resources more efficiently.
•Temperature Monitoring and Alert: To prevent system overheat and system
damage, there are heat sensors to monitor the CPU (the Pentium II processor
requires a special heatsink with a thermal sensor) and system temperatures to
warn of damaging temperatures.
•Voltage Monitoring and Alert: System voltage levels are monitored to ensure
stable voltage to critical motherboard components. Voltage specifications are
more critical for future processors, so monitoring is necessary to ensure proper
system configuration and management.

ASUS P2B-F User’s Manual 11
The ASUS P2B-F Motherboard
II. FEATURES
II. FEATURES
Motherboard Parts
T: USB Conn 1
B: USB Conn 2
B: COM 1
B: COM 2
Programmable
2Mbit Flash EEPROM
Accelerated
Graphics Port
2ISASlots
T: PS/2 Mouse
B: PS/2 Keyboard
T: Parallel
B: Serial
4 DIMM SocketsIntel 440BXAGPset
SEC CPU Socket
(PENTIUM II)
ATX Power
Connector
5 PCI Slots
Super
Multi-I/O Chip
Hardware
Monitoring Chip
Wake-On-LAN
Connector
SB-Link™
Connector

12 ASUS P2B-F User’s Manual
III. INSTALLATION
Layout of the ASUS P2B-F Motherboard
CPU_FAN
Intel
PIIX4E
PCIset
Intel
440BX
AGPset
Flash EEPROM
(Programable BIOS)
CHA_FAN
IDELED
Multi-I/O
R
CLRTC
SBLINK
JTCPU
KBWK
JTPWR
Hardware
Monitor
FREQ MULT
BF2
BF3
BF1
BF0
IR
ATXPWR
FS1
FS2
FS0
FS3
CR2032 3V
Lithium Cell
(BIOS Power) Accelerated Graphics Port
PCI Slot 4
PWR_FAN
ATX Power Conenctor
USB
PS/2
TOP:
USB 1
BOTTOM:
USB 2
PCI Slot 3
PCI Slot 2
PCI Slot 1
TOP:
Mouse
BOTTOM:
Keyboard
PCI Slot 5
SECONDARY IDE
PRIMARY IDE
Panel Connectors
Infrared
Connector
ISA Slot 1
ISA Slot 2
ASUS
ASIC
CHASSIS
FLOPPY
Single Edge Contact CPU Slot (for Pentium II processor)
DIMM Socket 0 (64/72 bit, 168 pin module)
SMB Connector
DIMM Socket 1 (64/72 bit, 168 pin module) DIMM Socket 2 (64/72 bit, 168 pin module) DIMM Socket 3 (64/72 bit, 168 pin module)
BUS FREQ
COM 1
Parallel Port Connector
COM 2
Wake-On-LAN
Connector
AGPFS
SMB
WOL_CON
Board Layout
III. INSTALLATION

ASUS P2B-F User’s Manual 13
III. INSTALLATION
Jumpers
1) CLRTC p. 15 Clear Real Time Clock (RTC) RAM (Short/Clear CMOS)
2) KBWK p. 15 Keyboard Power Up
3) AGPFS p. 15 AGP Bus Frequency Selection
4) FS0, FS1, FS2, FS3 p. 16 CPU External Clock (BUS) Frequency Selection
5) BF0, BF1, BF2, BF3 p. 16 CPU Core:BUS Frequency Multiple
Expansion Slots/Sockets
1) System Memory p. 17 System Memory Support
2) DIMM Sockets p. 18 DIMM Memory Module Support
3) SEC CPU Slot p. 19 Single Edge Contact CPU Support
4) SLOT1, SLOT2 p. 24 16-bit ISA Bus Expansion Slots
*
5) PCI1,2,3,4,5 p. 24 32-bit PCI Bus Expansion Slots
6) AGP p. 25 Accelerated Graphics Port
Hardware Monitor
1) JTPWR, JTCPU p. 22 Heat Sensor Connector
Connectors
1) PS2KBMS p. 26 PS/2 Mouse Port Connector (6 pin-female)
2) PS2KBMS p. 26 PS/2 Keyboard Port Connector (6-pin female)
3) PARALLEL p. 27 Parallel (Printer) Port Connector (25-pin female)
4) COM1, COM2 p. 27 Serial Port COM1 & COM2 (two 9-pin male)
5) FLOPPY p. 27 Floppy Drive Port Connector (34 pins)
6) USB p. 28 UniversalSerialBUSPortConnectors1&2(two4-pinfemale)
7) Primary/Secondary IDE p. 28 Primary/Secondary IDE Connector (40 pins)
8) IDELED p. 28 IDE LED Activity Light (2 pins)
9) CHA_, PWR_, CPU_FAN p. 29 Chassis, Power Supply, CPU Fan Power Lead (3 pins)
10) CHASSIS p. 29 Chassis Intrusion Alarm Lead (3 pins)
11) IR p. 30 Infrared Port Module Connector (5 pins)
12) ATXPWR p. 30 ATX Motherboard Power Connector (20 pins)
13) WOL_CON p. 31Wake-On-LAN Connector (3 pins)
14) SBLINK p. 31 SB-Link™ Port Connector (6-1 pins)
15) SMB p. 31 SMBus Connector (3 pins)
16)
PWR.LED ( PANEL ) p. 32 System Power LED Lead (3 pins)
17)
KEYLOCK ( PANEL ) p. 32 Keyboard Lock Switch Lead (2 pins)
18) SPEAKER (PANEL) p. 32 Speaker Output Connector (4 pins)
19) MSG.LED (PANEL) p. 32System Message LED (2 pins)
20) SMI (PANEL) p. 32 SMI Switch Lead (2 pins)
21) PWRSW (PANEL) p. 32 ATX Power & Soft-Off Switch Lead (2 pins)
22) RESET (PANEL) p. 32 Reset Switch Lead (2 pins)
*
The onboard hardware monitor uses the address 290H-297H so legacy ISA cards must not
use this address otherwise conflicts will occur.
(Board Layout)
III. INSTALLATION

14 ASUS P2B-F User’s Manual
III. INSTALLATION
Jumpers
III. INSTALLATION
Installation Steps
Before using your computer, you must complete the following steps:
1. Set Jumpers
2. Install Memory Modules
3. Install the Central Processing Unit (CPU)
4. Install Expansion Cards
5. Connect Ribbon Cables, Cabinet Wires, and Power Supply
6. Setup the BIOS Software
1. Jumpers
WARNING! Computer motherboards and expansion cards contain very delicate
Integrated Circuit (IC) chips.To protect them against damage from static electric-
ity, you should follow some precautions whenever you work on your computer.
1. Unplug your computer when working on the inside.
2. Use a grounded wrist strap before handling computer components. If you do
not have one, touch both of your hands to a safely grounded object or to a
metal object, such as the power supply case.
3. Hold components by the edges and try not to touch the IC chips, leads or
connectors, or other components.
4. Place components on a grounded antistatic pad or on the bag that came with
the component whenever the components are separated from the system.

ASUS P2B-F User’s Manual 15
III. INSTALLATION
III. INSTALLATION
Jumpers
Jumper Settings
1. Clear Real Time Clock (RTC) RAM (CLRTC)
The CMOS RAM is powered by the onboard button cell battery. To clear the
RTC data: (1) Turn off your computer and unplug yourAC power, (2) Short the
two points labeled CLRTC, (3) Turn on your computer, (4) Hold down
<Delete> during bootup and enter BIOS setup to re-enter user preferences.
Short small solder points to clear CMOS
P2B-F Clear RTC RAM
CLRTC
R
2. Keyboard Power Up (KBWK)
This allows you to disable or enable the keyboard power up function. Set to
Enable if you want to use your keyboard (by pressing <Spacebar>) to power up
your computer. This feature requires an ATX power supply that can supply at
least 300mA on the +5VSB lead. The default is set to Disable because not all
computers have the appropriateATX power supply.Your computer will not func-
tion if you set this to Enable and if you do not have the rightATX power supply.
Disable
(Default)
KBWK
Enable
P2B-F Keyboard Power Up
R
1
2
3
1
2
3
3. AGP Frequency Selector (AGPFS)
This option sets the frequency ratio between the AGP bus frequency and the
CPU bus frequency. The default sets the AGP bus frequency to be 2/3 of the
CPU bus frequency.
R
P2B-F AGP Settings
2:3
(Default)
AGPFS
1:1
1
2
3
1
2
3
WARNING! AGP bus frequencies above 66MHz exceed the specifications for
the AGP interface and are not guaranteed to be stable.
(See the processor table on the next page)

16 ASUS P2B-F User’s Manual
III. INSTALLATION
Jumpers
III. INSTALLATION
CPU Core:BUS Frequency Multiple
P2B-F CPU Settings CPU External Clock (BUS) Frequency Selection
R
66MHz
FS2 FS1 FS3
1
2
3
FS0
75MHz
FS2 FS1 FS3
1
2
3
FS0
83MHz
FS2 FS1 FS3
1
2
3
FS0
100MHz
FS2 FS1 FS3
1
2
3
FS0
103MHz
FS2 FS1 FS3
1
2
3
FS0
BF1
BF2
BF0
BF3
2.5x (5/2)
2
1
3
BF1
BF2
BF0
BF3
3.0x (3/1)
2
1
3
BF1
BF2
BF0
BF3
3.5x (7/2)
2
1
3
BF1
BF2
BF0
BF3
4.0x (4/1)
2
1
3
BF3 BF1
BF2
BF0
4.5x (9/2)
2
1
3
2
1
3
BF1
BF2
BF0
BF3
5.5x (11/2)
2
1
3
BF1
BF2
BF0
BF3
2.0x (2/1)
6.0x (6/1)
2
1
3
BF1
BF2
BF0
BF3
6.5x (13/2)
2
1
3
BF1
BF2
BF0
BF3
7.0x (7/1)
2
1
3
BF1
BF2
BF0
BF3
7.5x (15/2)
2
1
3
BF1
BF2
BF0
BF3
BF1
BF2
BF0
BF3
5.0x (5/1)
8.0x (8/1)
BF1
BF2
BF0
BF3
133MHz
FS2 FS1 FS3
1
2
3
FS0
124MHz
FS2 FS1 FS3
1
2
3
FS0
1
2
3
112MHz
FS2 FS1 FS3 FS0
3. CPU Bus Frequency Selector (FS0, FS1, FS2, FS3)
This option tells the clock generator what frequency to send to the CPU, DRAM, and
440BX AGPset. This allows the selection of the CPU’s External frequency (or BUS
Clock). The BUS Clock multiplied by the BUS Ratio equals the CPU’s Internal fre-
quency (the advertised CPU speed).
4. CPU Core:BUS Frequency Multiple (BF0, BF1, BF2, BF3)
This option sets the frequency multiple between the Internal frequency of the
CPU and the CPU’s External frequency. These must be set in conjunction with the
CPU Bus Frequency.
NOTES:Overclocking your processor is not recommended. It may result in a slower
speed. Voltage Regulator Output Selection (VID) is not needed for the Pentium II
processor because it sends a VID signal directly to the onboard power controller.
Set the jumpers by the Internal speed of your processor as follows:
(CPU BUS Freq.) (Freq. Multiple)
CPU Model Freq. Ratio BUS F. FS3 FS2 FS1 FS0 BF3 BF2 BF1 BF0 AGP
Intel Pentium II 450MHz 4.5x 100MHz [2-3] [1-2] [1-2] [1-2] [2-3] [1-2] [2-3] [1-2] [1-2]
Intel Pentium II 400MHz 4.0x 100MHz [2-3] [1-2] [1-2] [1-2] [2-3] [1-2] [2-3] [2-3] [1-2]
Intel Pentium II 350MHz 3.5x 100MHz [2-3] [1-2] [1-2] [1-2] [2-3] [2-3] [1-2] [1-2] [1-2]
Intel Pentium II 333MHz 5.0x 66MHz [2-3] [2-3] [1-2] [1-2] [2-3] [1-2] [1-2] [2-3] [2-3]
Intel Pentium II 300MHz 4.5x 66MHz [2-3] [2-3] [1-2] [1-2] [2-3] [1-2] [2-3] [1-2] [2-3]
Intel Pentium II 266MHz 4.0x 66MHz [2-3] [2-3] [1-2] [1-2] [2-3] [1-2] [2-3] [2-3] [2-3]
Intel Pentium II 233MHz 3.5x 66MHz [2-3] [2-3] [1-2] [1-2] [2-3] [2-3] [1-2] [1-2] [2-3]
WARNING! Frequencies above 100MHz exceed the specifications for the on-
board Intel Chipset and are not guaranteed to be stable.
Intel Pentium II Processor in an SEC Cartridge (233-450MHz)

ASUS P2B-F User’s Manual 17
III. INSTALLATION
System Memory
2. System Memory (DIMM)
This motherboard uses only Dual Inline Memory Modules (DIMMs). Four sockets
are available for 3.3Volt (power level) unbuffered Synchronous Dynamic Random
Access Memory (SDRAM). One side (with memory chips) of the DIMM takes up one
row on the motherboard.
To utilize the chipset’s Error Checking and Correction (ECC) feature, you must use a
DIMM module with 9 chips per side (standard 8 chips/side + 1 ECC chip) and make
the proper settings through “Chipset Features Setup” in BIOS setup.
Memoryspeedsetup is recommended through SDRAM Configuration under “Chipset
Features Setup” in BIOS setup.
General DIMM Notes
•For the system CPU bus to operate above 100MHz, use only PC100-compliant
DIMMs . This motherboard operates at 100MHz, thus most systems will not even boot if
non-compliant modules are used because of the strict timing issues involved under this
speed. If your DIMMs are not PC100-compliant, set the CPU bus frequency to 66MHz
for system stability.
•Two possible memory chips are supported: SDRAM with and without ECC.
• SDRAM chips are generally thinner with higher pin density than EDO (Extended Data
Output) chips.
• BIOS shows SDRAM memory on bootup screen.
• 8 chips/side modules do not support ECC, only 9 chips/side modules support ECC.
• Single-sidedDIMMscomein 16, 32,64,128MB;double-sidedcomein32,64, 128, 256MB.
III. INSTALLATION
Install memory in any combination as follows:
DIMM Location 168-pin DIMM Total Memory
Socket 1 (Rows 0&1) SDRAM 8, 16, 32, 64, 128, 256MB x1
Socket 2 (Rows 2&3) SDRAM 8, 16, 32, 64, 128, 256MB x1
Socket 3 (Rows 4&5) SDRAM 8, 16, 32, 64, 128, 256MB x1
Socket 4 (Rows 6&7) SDRAM 8, 16, 32, 64, 128, 256MB x1
Total System Memory (Max 1024MB) =

18 ASUS P2B-F User’s Manual
System Memory
III. INSTALLATION
III. INSTALLATION
DIMM Memory Installation Procedures:
Insert the module(s) as shown. Because the number of pins are different on either
side of the breaks, the module will only fit in the orientation as shown. DRAM
SIMM modules have the same pin contacts on both sides. SDRAM DIMMs have
different pin contacts on each side and therefore have a higher pin density.
Lock
P2B-F 168-Pin DIMM Memory Sockets
20 Pins 60 Pins 88 Pins
R
The DIMMs must be 3.3Volt unbuffered SDRAMs. To determine the DIMM type,
check the notches on the DIMMs (see figure below).
168-Pin DIMM Notch Key Definitions (3.3V)
DRAM Key Position Voltage Key Position
Unbuffered
RFU
Buffered Reserved
3.3V
5.0V
The notches on the DIMM will shift between left, center, or right to identify the type
and also to prevent the wrong type from being inserted into the DIMM slot on the
motherboard. You must tell your retailer the correct DIMM type before purchasing.
This motherboard supports four clock signals per DIMM.

ASUS P2B-F User’s Manual 19
3. Central Processing Unit (CPU)
This motherboard provides a Single Edge Contact (SEC) slot for a Pentium II pro-
cessor packaged in an SEC cartridge.
Pentium II Processor
WARNING! Be sure that sufficient air is circulating across the processor’s pas-
sive heatsink because the processor could overheat, which could damage both the
processor and the motherboard. You may install an auxiliary fan, if necessary.
You should check to see that you have the following 9 items.
NOTE: The pictures in the following pages will have the same item numbers next to
them for your reference. The design and color of your items may be slightly different.
Attach Mount Bridges (Items 1,2)
(1)
(2)
Pentium II Retention Mechanism (Item 3)
Lock Holes
Captive Nut
(3)
Pentium II Processor Heatsink (Item 8)
(8)
Heatsink bottom Groove
for the Support Top Bar
Larger Fin should
be on the bottom.
Heatsink Support Base/Top Bar (Items 4-7)
Top Bar (4)
Base (7)
Posts
Pin
(5)
(6)
III. INSTALLATION
CPU
III. INSTALLATION
CPU (Item 9)
Intel Pentium II Processor in an SEC Cartridge

20 ASUS P2B-F User’s Manual
III. INSTALLATION
CPU
III. INSTALLATION
Attach Mount Bridges
Four screws should be showing next to each corner of the SEC CPU Slot with the two
attach mount bridges installed.
Lock holes
Captive nut
Captive nut
NOTE: Encircled items are the screws
from the mount bridges (1 & 2)
Installing the Pentium II Processor
1. Mount the Pentium II Retention Mechanism: The retention mechanism is
designed to fit into the SEC slot only one way.
TIP: Orient the mechanism’s lock holes toward the motherboard’s chipsets (see
motherboard layout for the location of the chipset).
Be sure to align the notch in the mechanism with the small rib on one side of the
slot and that the mechanism is properly seated on the board. Then, screw the
captive nuts in place.
WARNING! Do not overtighten the captive nuts. Doing so could damage your
motherboard. Tighten captive nuts to no more than 6±1 inch/pound.
SEC CPU slot