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ASUS COMPUTER GmbH

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CONTENTS

I. INTRODUCTION 7 How this Manual is Organized... 7 Item Checklist... 7 II. FEATURES 8 Features of the ASUS P2B-B Motherboard.. 8 The ASUS P2B-B Motherboard.. 11 III. INSTALLATION 12 Layout of the ASUS P2B-B Motherboard.. 12 Installation Steps... 14 1. Jumpers.... 14 Jumper Settings... 14 2. System Memory (DIMM)... 17 DIMM Memory Installation Procedures:.. 18 3. Central Processing Unit (CPU).. 19 Universal Retention Mechanism.. 19 Heatsinks... 19 Installing the Processor... 20 ASUS Smart Thermal Solutions.. 22 Recommended Heatsinks for Slot 1 Processors.. 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... 35 IV. BIOS SOFTWARE 36 Flash Memory Writer Utility.. 36 Main Menu.... 36 Managing and Updating Your Motherboards BIOS. 38 6. BIOS Setup.... 39 Load Defaults.. 40 Standard CMOS Setup... 40 Details of Standard CMOS Setup:... 40 BIOS Features Setup.. 43 Details of BIOS Features Setup.. 43
Chipset Features Setup... 46 Details of Chipset Features Setup.. 46 Power Management Setup... 49 Details of Power Management Setup. 49 PNP and PCI Setup... 52 Details of PNP and PCI Setup.. 52 Load BIOS Defaults... 54 Load Setup Defaults... 54 Supervisor Password and User Password.. 55 IDE HDD Auto Detection... 56 Save & Exit Setup... 57 Exit Without Saving... 57 V. SUPPORT CD 58 ASUS Smart Motherboard Support CD.. 58 Desktop Management Interface (DMI).. 59 Introducing the ASUS DMI Configuration Utility. 59 System Requirements.. 59 Using the ASUS DMI Configuration Utility.. 60 VI. ASUS LAN Card 63 ASUS PCI-L101 Fast Ethernet Card.. 63 Features... 64 Software Driver Support... 64 Question and Answer... 64

FCC & DOC COMPLIANCE

Federal Communications Commission Statement
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.

II. FEATURES Specifications 10
The ASUS P2B-B Motherboard
Super Multi-I/O Hardware Monitor 2 ISA Slots 3 PCI Slots
Thermal Sensor PS/2 Mouse, USB, Connector IrDA Header Serial, Parallel, Floppy

AT Power Connector

ATX Power Connector
AGP Slot Slot 1 Intel 440BX AGPset
3 DIMM Sockets Universal Folding Retention Mech. IDE Connectors Programmable Flash EEPROM
II. FEATURES Motherboard Parts

III. INSTALLATION

Layout of the ASUS P2B-B Motherboard

Hardware Monitor

KB-PS2KB

PARALLEL

PWR_FAN

SBLINK

WOL_CON Wake-On-LAN Connector

FLOPPY

AT Power Connector ATXPWR ATX Power Connector

PCI Slot 3 (PCI3)

PCI Slot 2 (PCI2)

CHASIS

PCI Slot 1 (PCI1)
Accelerated Graphics Port

ISA Slot 2

ISA Slot 1

CPU_FAN

DIMM Socket 3 (64/72-bit, 168-pin module)
DIMM Socket 2 (64/72-bit, 168-pin module)

Intel PIIX4 PCIset

BIOS Power

CR2032 3V Lithium Cell

System BIOS Flash EEPROM

FREQ MULT

SECONDARY IDE

ASUS ASIC

PRIMARY IDE

BUS FREQ

FS0 FS1 FS2 FS3

BF0 BF1 BF2 BF3

IDELED

CHA_FAN

DIMM Socket 1 (64/72-bit, 168-pin module)

CPU Slot 1

Intel 440BX AGPset

Super Multi I/O

USB/MIR

Serial Ports

Keyboard
III. INSTALLATION Motherboard Layout

Jumpers

1) 2) 3) 4) 5) CLR_RTC KBPWR VIO FS0, FS1, FS2, FS3 BF0, BF1, BF2, BF3 p. 14 Clear Real Time Clock (RTC) RAM (Short/Clear CMOS) p. 15 Keyboard Power Up p. 15 Voltage Input/Output Selection p. 16 CPU External Clock (BUS) Frequency Selection p. 16 CPU Core:BUS Frequency Multiple

Expansion Slots/Sockets

1) 2) 3) 4) 5) DIMM Sockets CPU Slot 1 SLOT1, SLOT2 PCI1, PCI2, PCI3 AGP p. 17 168-Pin DIMM Memory Module Support p. 19 CPU Support p. 24 16-bit ISA Bus Expansion Slots* p. 24 32-bit PCI Bus Expansion Slots p. 25 Accelerated Graphics Port

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/Celeron processor because it sends a VID signal directly to the onboard power controller.

2. System Memory (DIMM)

This motherboard uses only Dual Inline Memory Modules (DIMMs). 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 chipsets 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. Memory speed setup is recommended through SDRAM Configuration under Chipset Features Setup in BIOS setup.
DIMM Location Socket 1 (Rows 0&1) Socket 2 (Rows 2&3) Socket 3 (Rows 4&5)
168-pin DIMM Memory Modules SDRAM 8, 16, 32, 64, 128, 256MB SDRAM 8, 16, 32, 64, 128, 256MB SDRAM 8, 16, 32, 64, 128, 256MB Total System Memory (Max 768MB) x1 x1 x1 =

Total Memory

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-sided DIMMs come in 16, 32, 64,128MB; double-sided come in 32, 64, 128, 256MB.
III. INSTALLATION System Memory
Install memory in any combination as follows:
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.

20 Pins 60 Pins

88 Pins
III. INSTALLATION System Memory 18
P2B-B 168-Pin DIMM Memory Sockets

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 Unbuffered RFU Buffered
Voltage Key Position 5.0V 3.3V Reserved
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.
3. Central Processing Unit (CPU)
Your motherboard provides a Slot 1 connector for a Pentium II processor packaged in a Single Edge Contact Cartridge (SECC/SECC2) or a Celeron processor packaged in a Single Edge Processor Package (SEPP).
Pentium II processor packaged in an SECC with heatsink and fan (top view)
Pentium II processor packaged in an SECC2 or Celeron processor packaged in an SEPP with heatsink and fan (top view)
Your motherboard comes preinstalled with a Universal Retention Mechanism (URM). The URM supports Pentium II and Celeron processors.
Universal Retention Mechanism (URM)

Heatsinks

The recommended heatsinks (see section on recommended heatsinks for Pentium II processors for more information) for the boxed Pentium II and Celeron processors are those with three-pin fans that can be connected to the fan connectors on the motherboard. WARNING! Be sure that there is sufficient air circulation across the processors heatsink by regularly checking that your CPU fan is working. Without sufficient circulation, the processor could overheat and damage both the processor and the motherboard. You may install an auxiliary fan, if necessary.

III. INSTALLATION CPU

Universal Retention Mechanism

Installing the Processor

1. Unlock the URMs Folding Support Arms: The folding support arms of the URM are locked when shipped.
Locked Folding Support Arms
To unlock the support arms, simply flip them up to an upright position.
The URM is now ready for the installation of your processor. III. INSTALLATION CPU 20 2. Attach the Heatsink
Unlocked Folding Support Arms
NOTE: Follow carefully the heatsink attachment instructions included with your heatsink or processor. The following steps are provided only as a general guide and may not reflect those for your heatsink. SECC with Pentium II Place the SECC face down on a flat surface Push each end of the clamps until they lock and lay the heat sink flush on the back (metal Lock Lock side) of the SECC. Check the orientation of the heatsink against the illustration below. The thicker fin must be orientated toward the bottom. The top clamp is wider than the bottom clamp so only this orientation will fit. With a screw driver, push the clamps one at a time into the SECC. Be sure that the heatsink is firmly pressed against the SECC. SECC2 with Pentium II/SEPPwith Celeron Insert the heatsink clip through the holes at the SECC2/SEPPs back, making sure that the bottom of the clip plate sits against the processorss back. Remove the tab from the thermal grease, SECC2/SEPP Heatsink Clip Legs which is located on the bottom of the heatsink) and place the heatsink over the processor. A slight rocking motion may be necessary to place the heatsink on the SECC2/SEPP, with one pair of the heatsink clip legs going first through the corresponding heatsink holes, and then the other pair. (NOTE: The heatsink and SECC2/SEPP holes are slightly offset to ensure good locking grip between the two.)

ASUS P2T-Cable The optional ASUS P2T-Cable can be used for a Pentium II processor packaged in an SECC/SECC2 or a Celeron processor packaged in an SEPP.

Sensor

Sensor Connector Plug
NOTE: The ASUS P2T-Cable can only be used in a Slot 1 motherboard with a 2-pin thermal sensor connector. To Use the ASUS P2T-Cable NOTE: The following procedures assume that you have properly attached a heatsink onto an SECC/SECC2/SEPP. 1. Simply peel off the tab from the sensor and then stick the sensor near the middle edge of the Intel boxed processor heatsink with fan (middle) or to either the upper or lower edge of the Celeron heatsink (right), as indicated.

Tab Sensor

OR STICK ABOUT HERE
WARNING! Do not insert the sensor between the processor and heatsink, otherwise, it will cause damage to the P2T-Cable. IMPORTANT! ASUS guarantees accurate readings only for the ASUS Smart Fan and the Intel boxed processor heatsink with fan because both have similar heat distribution and heatsink material. 2. Connect the P2T-Cable to the CPU thermal sensor connector (RT2). III. INSTALLATION CPU 23
RT3 Thermal Sensor for Power Supply
RT2 Thermal Sensor for CPU
P2B-B CPU Thermal Sensor Connectors
NOTE: If you have a power supply with thermal monitoring, connect its thermal sensor cable to RT3.
Recommended Heatsinks for Slot 1 Processors
The recommended heatsinks for the Slot 1 processors are those with three-pin fans, such as the ASUS Smart Fan, that can be connected to the motherboards CPU fan connector. These heatsinks, such as the Elan Vital Heatsink with Fan, dissipate heat more efficiently and with an optional hardware monitor, they can monitor the fans RPM and use the alert function with the Intel LANDesk Client Manager (LDCM) and the ASUS PC Probe software. Elan Vital Heatsink with Fan To install, simply follow the procedures for Installing the Processor. The Elan Vital heatsink, however, comes with a lever to clamp the heatsink into the SEC cartridge. Mount the heatsink in the orientation as shown then flip the lever from Unlock to Lock.

GND +12V Rotation

CPU Fan Power

Power Supply Fan

Rotation +12V GND

Chassis Fan Power

P2B-B 12Volt Cooling Fan Power
8. Wake-On-LAN Connector (3-pin WOL_CON) This connector connects to a LAN card with a Wake-On-LAN output, such as the ASUS PCI-L101. The LAN card powers up the system when a wakeup packet or signal is received from the network. IMPORTANT: This feature requires that the WAKE On LAN Power Up Control is set to Enabled (see Power Management Setup under BIOS SOFTWARE section) and that your system has an ATX power supply with at least 720mA +5V standby power.

+5 VSB PME

Ground
P2B-B Wake-On-LAN Connector
9. Message LED Lead (2-pin MSG.LED) This indicates whether a message has been received from a fax/modem. The LED will remain lit when there is no signal and blink when there is data transfer or messages waiting in the inbox. This function requires ACPI OS support. 10. System Management Interrupt Lead (2-pin SMI) This allows the user to manually place the system into a suspend mode or Green mode where system activity will be instantly decreased to save electricity and expand the life of certain components when the system is not in use. This 2-pin connector (see the figure below) connects to the case-mounted suspend switch. If you do not have a switch for the connector, you may use the Turbo Switch since it does not have a function. SMI is activated when it detects a short to open moment and therefore leaving it shorted will not cause any problems. May require one or two pushes depending on the position of the switch. Wake-up can be controlled by settings in the BIOS but the keyboard will always allow wakeup (the SMI lead cannot wake-up the system). If you want to use this connector, Suspend Switch in the Power Management Setup of the BIOS SOFTWARE section should be on the default setting of Enable. 11. ATX Power Switch/Soft Power Switch Lead (2-pin PWR.SW) The system power can be controlled by a momentary switch connected to this lead. Pushing the button once will switch the system between ON and SLEEP. Pushing the switch while in the ON mode for more than 4 seconds will turn the system off. The system power LED shows the status of the systems power. 12. Reset Switch Lead (2-pin RESET) This 2-pin connector connects to the case-mounted reset switch for rebooting your computer without having to turn off your power switch This is a preferred method of rebooting in order to prolong the life of the systems power supply. 13. System Power LED (3-1 pin PWR.LED) This 3-pin connector connects the system power LED, which lights when the system is powered on and flashes when it is in sleep mode. 14. Keyboard Lock Switch Lead (2-pin KEYLOCK) This 2-pin connector connects to the case-mounted key switch to allow keyboard locking. 15. Speaker Connector (4-pin SPEAKER) This 4-pin connector connects to the case-mounted speaker.

IV. BIOS BIOS Features 44
HDD S.M.A.R.T. capability (Disabled) This allows the enabling or disabling of the S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) system which utilizes internal hard disk drive monitoring technology. This feature is normally disabled because system resources used in this feature may decrease system performance. PS/2 Mouse Function Control (Auto) The default of Auto allows the system to detect a PS/2 mouse on bootup. If detected, IRQ12 will be used for the PS/2 mouse. IRQ12 will be reserved for expansion cards if a PS/2 mouse is not detected. Enabled will always reserve IRQ12, whether on bootup a PS/2 mouse is detected or not. OS/2 Onboard Memory > 64M (Disabled) When using OS/2 operating systems with installed DRAM of greater than 64MB, you need to set this option to Enabled otherwise leave this on Disabled.... PCI/VGA Palette Snoop (Disabled) Some display cards that are nonstandard VGA such as graphics accelerators or MPEG Video Cards may not show colors properly. The setting Enabled should correct this problem. Otherwise leave this on the setup default setting of Disabled. Video ROM BIOS Shadow (Enabled) This field allows you to change the video BIOS location from ROM to RAM. Relocating to RAM enhances system performance, as information access is faster than the ROM. C8000-CBFFF to DC000-DFFFF (Disabled) These fields are used for shadowing other expansion card ROMs. If you install other expansion cards with ROMs on them, you will need to know which addresses the ROMs use to shadow them specifically. Shadowing a ROM reduces the memory available between 640K and 1024K by the amount used for this purpose. Boot Up NumLock Status (On) This field enables users to activate the Number Lock function upon system boot. Typematic Rate Setting (Disabled) When enabled, you can set the two typematic controls listed next. Setup default setting is Disabled. Typematic Rate (Chars/Sec) (6) This field controls the speed at which the system registers repeated keystrokes. Options range from 6 to 30 characters per second. Setup default setting is 6; other settings are 8, 10, 12, 15, 20, 24, and 30. Typematic Delay (Msec) (250) This field sets the time interval for displaying the first and second characters. Four delay rate options are available: 250, 500, 750, and 1000. Security Option (System) When you specify a Supervisor Password and/or User Password (explained later in this section), the Security Option field determines when the system prompts for the password. The default setting is System, where the system prompts for the User Password every time you start your system. The other option is Setup, where the system goes through its startup routine unless the Setup utility is called, when the system prompts for the Supervisor Password.

IV. BIOS BIOS Features

Chipset Features Setup
The Chipset Features Setup option controls the configuration of the boards chipset. Control keys for this screen are the same as for the previous screen.
NOTE: SETUP Defaults are noted in parenthesis next to each function heading.
Details of Chipset Features Setup
SDRAM Configuration (By SPD) This sets the optimal timings for items 2-5. Leave on default setting. SDRAM CAS Latency (2T) This controls the latency between SDRAM read command and the time that the data actually becomes available. Leave on default setting. SDRAM RAS to CAS Delay (2T) This controls the latency between SDRAM active command and the read/write command. Leave on default setting. SDRAM RAS Precharge Time (2T) This controls the idle clocks after issuing a precharge command to SDRAM. Leave on default setting. DRAM Idle Timer (0T) This controls the idle clocks before closing an opened SDRAM page. Leave on default setting. SDRAM MA Wait State (Normal) This controls the leadoff clocks for CPU read cycles. Leave on default setting. Snoop Ahead (Enabled) Enabled will allow PCI streaming. Leave on default setting. Host Bus Fast Data Ready (Disabled) Leave on default setting. 16-bit I/O Recovery Time (1 BUSCLK) / 8-bit I/O Recovery Time (1 BUSCLK) Timing for 16-bit and 8-bit ISA cards, respectively. Leave on default setting.
IV. BIOS Chipset Features 46
Graphics Aperture Size (64MB) Memory-mapped, graphics data structures can reside in a Graphics Aperture. Leave on default setting. Video Memory Cache Mode (UC) USWC (uncacheable, speculative write combining) is a new cache technology for the video memory of the processor. It can greatly improve the display speed by caching the display data. You must leave this on the default setting of UC (uncacheable) if your display card cannot support this feature or else your system may not boot. PCI 2.1 Support (Enabled) This function allows you to enable or disable PCI 2.1 features including passive release and delayed transaction. Leave Enabled (default setting) for PCI 2.1 compliancy. Memory Hole At 15M16M (Disabled) Enabling this feature reserves 15MB to 16MB memory address space to ISA expansion cards that specifically require this setting. This makes the memory from 15MB and up unavailable to the system. Expansion cards can only access memory up to 16MB. The default is Disabled. DRAM are xx bits wide If all your DIMMs have ECC (e.g., 8 chips + 1 ECC chip), they are considered 72bits and the following will be displayed: IV. BIOS Chipset Features 47

If your DIMMs do not have ECC (e.g. 8 chips), they are considered 64 bits and the following will be displayed instead:
Data Integrity Mode (Non-ECC) Non-ECC has byte-wise write capability but no provision for protecting data integrity in the DRAM array. EC-Only data errors are detected but not corrected. ECC with hardware scrubbing allows a detection of single-bit and multiple-bit errors and recovery of single-bit errors. (See section III for more information on DRAM memory modules.).... Onboard FDC Controller (Enabled) When Enabled, this field allows you to connect your floppy disk drives to the onboard floppy disk drive connector instead of a separate controller card. If you want to use a different controller card to connect the floppy disk drives, set this field to Disabled.
Onboard FDC Swap A & B (No Swap) This field allows you to reverse the hardware drive letter assignments of your floppy disk drives. Two options are available: No Swap and Swap AB. If you want to switch drive letter assignments through the onboard chipset, set this field to Swap AB. Onboard Serial Port 1 (3F8H/IRQ4) Settings are 3F8H/IRQ4, 2F8H/IRQ3, 3E8H/IRQ4, 2E8H/IRQ10, and Disabled for the onboard serial connector. Onboard Serial Port 2 (2F8H/IRQ3) Settings are 3F8H/IRQ4, 2F8H/IRQ3, 3E8H/IRQ4, 2E8H/IRQ10, and Disabled for the onboard serial connector. Onboard Parallel Port (378H/IRQ7) This field sets the address of the onboard parallel port connector. You can select either: 3BCH / IRQ 7, 378H / IRQ 7, 278H / IRQ 5, Disabled. If you install an I/O card with a parallel port, ensure that there is no conflict in the address assignments. The PC can support up to three parallel ports as long as there are no conflicts for each port. Parallel Port Mode (ECP+EPP) This field allows you to set the operation mode of the parallel port. The setting Normal, allows normal-speed operation but in one direction only; EPP allows bidirectional parallel port operation at maximum speed; ECP allows the parallel port to operate in bidirectional mode and at a speed faster than the maximum unidirectional data transfer rate; ECP+EPP allows normal speed operation in a two-way mode. ECP DMA Select (3) This selection is available only if you select ECP or ECP+EPP in the Parallel Port Mode. Select either DMA Channel 1, 3, or Disable. UART2 Use Infrared (Disabled) When enabled, this field activates the onboard infrared feature and sets the second serial UART to support the infrared module connector on the motherboard. If your system already has a second serial port connected to the onboard COM2 connector, it will no longer work if you enable the infrared feature. By default, this field is set to Disabled, which leaves the second serial port UART to support the COM2 serial port connector. See IrDA-compliant infrared module connector under section III. Onboard PCI IDE Enable (Both) You can select to enable the primary IDE channel, secondary IDE channel, both, or disable both channels (for systems with only SCSI drives). IDE Ultra DMA Mode (Auto) This field autodetects Ultra DMA capability (for improved transfer speeds and data integrity) for compatible IDE devices. Set to Disable to suppress Ultra DMA capability. IDE 0 Master/Slave PIO/DMA Mode, IDE 1 Master/Slave PIO/DMA Mode (Auto) Each channel (0 and 1) has both a master and a slave making four IDE devices possible. Because each IDE device may have a different Mode timing (0, 1, 2, 3, 4), it is necessary for these to be independent. The default setting of Auto will allow autodetection to ensure optimal performance

IV. BIOS Chipset Features 48

Power Management Setup

The Power Management Setup option allows you to reduce power consumption. This feature turns off the video display and shuts down the hard disk after a period of inactivity.
Details of Power Management Setup
IV. BIOS Power Management 49 Power Management (User Define) This field acts as the master control for the power management modes. Max Saving puts the system into power saving mode after a brief period of system inactivity; Min Saving is almost the same as Max Saving except that this time the system inactivity period is longer; Disable disables the power saving features; User Define allows you to set power saving options according to your preference. IMPORTANT: Advanced Power Management (APM) should be installed to keep the system time updated when the computer enters suspend mode activated by the BIOS Power Management. For DOS environments, you need to add the statement, DEVICE=C:\DOS\POWER.EXE, in you CONFIG.SYS. For Windows 3.x and Windows 95, you need to install Windows with the APM feature. A battery and power cord icon labeled Power will appear in the Control Panel. Choose Advanced in the Power Management Field. Video Off Option (Suspend -> Off ) This field determines when to activate the video off feature for monitor power management. The settings are Suspend -> Off and Always On.
Video Off Method (DPMS OFF) This field defines the video off features. The following options are available: DPMS OFF, DPMS Reduce ON, Blank Screen, V/H SYNC+Blank, DPMS Standby, and DPMS Suspend. The DPMS (Display Power Management System) features allow the BIOS to control the video display card if it supports the DPMS feature. Blank Screen only blanks the screen (use this for monitors without power management or green features. If set up in your system, your screen saver will not display with Blank Screen selected). V/H SYNC+Blank blanks the screen and turns off vertical and horizontal scanning..... PM Timers This section controls the time-out settings for the Power Management scheme. The fields included in this section are HDD Power Down, which places the hard disk into its lowest power consumption mode, and the Suspend mode which suspends the CPU. The system automatically wakes up from any power saving mode when there is system activity such as when a key is pressed from the keyboard, or when there is activity detected from the enabled IRQ channels. HDD Power Down (Disable) Shuts down any IDE hard disk drives in the system after a period of inactivity. This time period is user-configurable to 115 Min or Disable. This feature does not affect SCSI hard drives. Suspend Mode (Disable) Sets the period of time after which each of these modes activate: 30 sec, 1 Min, 2 Min, 4 Min, 8 Min, 20 Min, 30 Min, 40 Min, 1 Hour, and Disable..... Power Up Control This section determines the ways the system can be controlled when it is started or restarted, when modem activity is detected, or when power to the computer is interrupted and reapplied. The Soft-Off mode refers to powering off the system through a momentary button switch (ATX switch) or through the software as opposed to disconnecting the AC power by way of a rocker switch or other means. PWR Button < 4 Secs (Soft Off) When set to Soft Off, the ATX switch can be used as a normal system power-off button when pressed for less than 4 seconds. Suspend allows the button to have a dual function where pressing less than 4 seconds will place the system in sleep mode. Regardless of the setting, holding the ATX switch for more than 4 seconds will power off the system.

NOTE: If you forget the password, see CMOS RAM for procedures on clearing the CMOS.

IV. BIOS Passwords

IDE HDD Auto Detection
The IDE HDD Auto Detection option detects the parameters of an IDE hard disk drive, and automatically enters them into the Standard CMOS Setup screen.
Up to four IDE drives can be detected, with parameters for each listed inside the box. To accept the optimal entries, press <Y> or else select from the numbers displayed under the OPTIONS field (2, 1, 3 in this case); to skip to the next drive, press <N>. If you accept the values, the parameters will appear listed beside the drive letter on the screen. The process then proceeds to the next drive letter. Pressing <N> to skip rather than to accept a set of parameters causes the program to enter zeros after that drive letter. Remember that if you are using another IDE controller that does not feature Enhanced IDE support for four devices, you can only install two IDE hard disk drives. Your IDE controller must support the Enhanced IDE features in order to use Drive E and Drive F. The onboard PCI IDE controller supports Enhanced IDE, with two connectors for connecting up to four IDE devices. If you want to use another controller that supports four drives, you must disable the onboard IDE controller in the Chipset Features Setup screen. When auto-detection is completed, the program automatically enters all entries you accepted on the field for that drive in the Standard CMOS Setup screen. Skipped entries are ignored and are not entered in the screen. If you are auto-detecting a hard disk that supports the LBA mode, three lines will appear in the parameter box. Choose the line that lists LBA for an LBA drive. Do not select Large or Normal. The auto-detection feature can only detect one set of parameters for a particular IDE hard drive. Some IDE drives can use more than one set. This is not a problem if the drive is new and empty.
IV. BIOS Hard Disk Detect
IMPORTANT: If your hard disk was already formatted on an older previous system, incorrect parameters may be detected. You will need to enter the correct parameters manually or use low-level format if you do not need the data stored on the hard disk. If the parameters listed differ from the ones used when the disk was formatted, the disk will not be readable. If the auto-detected parameters do not match the ones that should be used for your disk, do not accept them. Press <N> to reject the presented settings and enter the correct ones manually from the Standard CMOS Setup screen.

Save & Exit Setup

Select this option to save into the CMOS memory all modifications you specified during the current session. To save the configuration changes, highlight the Save & Exit Setup option on the main screen, type Y, and then press <Enter>.

Exit Without Saving

Select this option to exit the Setup utility without saving the modifications you specify during the current session. To exit without saving, highlight the Exit Without Saving option on the main screen and then press <Enter>.

IV. BIOS Save & Exit

V. SUPPORT CD
ASUS Smart Motherboard Support CD
Inserting the support CD brings up a selection menu described as follows: (NOTE: CD version and contents are constantly modified without notice.) LDCM Local Setup: Installs software to monitor the local system. The LANDesk Client Manager must be installed in order to use the hardware manager features. LDCM Administrator Setup: Installs software to monitor PC systems on the network within the same bridge address with the Local software installed. The administrator should install both Local and Administrator Software. ASUS PC Probe Utility: Installs a simple software to monitor your computers fan, temperature, and voltages. (NOTE: Will not run with LDCM installed) Adobe Acrobat Reader: Installs the Adobe Acrobat Reader software necessary to view the LDCM manual in the LDCM directory. BusMaster: Installs the Intel BusMaster IDE drivers. Patch for PIIX4 chipset: Installs the necessary drivers for PCI card and PCI bridge for Windows 95/95a (OSR1) and 95b (OSR2) for ASUS motherboards. Browse this CD: Allows you to see the contents of the ASUS support CD. Technical Support Form: View the Technical Support Form with Notepad. LDCM IntroducE (MPEG VCD): View a video on the LDCM features. Read Me: View additional notes with Notepad. Exit: Exit the selection menu.
V. Support CD Contents 58
Additonal CD Contents: DMI Configuration Utility in the DMI directory and Flash BIOS writer in the AFLASH directory.
Desktop Management Interface (DMI)
Introducing the ASUS DMI Configuration Utility
This motherboard supports DMI within the BIOS level and provides a DMI Configuration Utility to maintain the Management Information Format Database (MIFD). DMI is able to auto-detect and record information pertinent to a computers system such as the CPU type, CPU speed, and internal/external frequencies, and memory size. The onboard BIOS will detect as many system information as possible and store those collected information in a 4KB block in the motherboards Flash EPROM and allow the DMI to retrieve data from this database. Unlike other BIOS software, the BIOS on this motherboard uses the same technology implemented for Plug and Play to allow dynamic real-time updating of DMI information versus creating a new BIOS image file and requiring the user to update the whole BIOS. This DMI Configuration Utility also allows the system integrator or end user to add additional information into the MIFD such as serial numbers, housing configurations, and vendor information. Those information not detected by the motherboard BIOS and has to be manually entered through the DMI Configuration Utility and updated into the MIFD. This DMI Configuration Utility provides the same reliability as PnP updating and will prevent the refreshing failures associated with updating the entire BIOS.

System Requirements

The DMI Configuration Utility (DMICFG2.EXE) must be used in real mode in order for the program to run, the base memory must be at least 180K. Memory managers like HIMEM.SYS (required by windows) must not be installed. You can boot up from a system diskette without AUTOEXEC.BAT and CONFIG.SYS files, REM HIMEM.SYS in the CONFIG.SYS, or press <Shift>+<F5> during bootup to bypass your AUTOEXEC.BAT and CONFIG.SYS files. 1. In Windows, copy DMICFG.EXE to your hard disk drive. 2. Restart your computer and press <Shift>+<F5> during bootup to enter safe mode command prompt. 3. Go to the directory containing DMICFG.EXE. 4. Type DMICFG and press <Enter> to run. V. Support CD DMI Introduction 59
Using the ASUS DMI Configuration Utility
NOTE: The following screen displays are provided as examples only and may not reflect the screen contents on your system. Edit DMI (or delete)
Use the (left-right) cursors to move the top menu items and the (up-down) cursor to move between the left hand menu items. The bottom of the screen will show the available keys for each screen. Press enter at the menu item to enter the right hand screen for editing. Edit component appears on top. The reversed color field is the current cursor position and the blue text are available for editing. The orange text shows auto-detected information and are not available for editing. The blue text Press [ENTER] for detail contains a second pop-up menu is available, use the + - (plus-minus) keys to change the settings. Enter to exit and save, ESC to exit and not save. If the user has made changes, ESC will prompt you to answer Y or N. Enter Y to go back to the left-hand screen and save, enter N to go back to left-hand screen and not save. If editing has not been made, ESC will send you back to the left hand menu without any messages.
V. Support CD Using DMI Utility 60
A heading, *** BIOS Auto Detect ***, appears on the right for each menu item on the left side that has been auto detected by the system BIOS. A heading, *** User Modified ***, will appear on the right for menu items that have been modified by the user.

Save MIFD

You can save the MIFD (normally only saved to flash ROM) to a file by entering the drive and path here. If you want to cancel save, you may press ESC and a message Bad File Name appears here to show it was not saved. Load MIFD
You can load the disk file to memory by entering a drive and path and file name here. Load BIOS Defaults V. Support CD Using DMI Utility You can load the BIOS defaults from a MIFD file and can clear all user modified and added data. You must reboot your computer in order for the defaults to be saved back into the Flash BIOS. ASUS P2B-B Users Manual 61
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VI. ASUS LAN Card

VI. ASUS LAN Card Parts / Layout 63
ASUS PCI-L101 Fast Ethernet Card
LAN Activity Output Signal