Asus P5-99B User manual

®
P5-99B
Super7 Baby AT Motherboard
USER’S MANUAL

2ASUS P5-99B User’s Manual
USER'S NOTICE
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, EI-
THER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PAR-
TICULAR PURPOSE. IN NO EVENT SHALLASUS, ITS DIRECTORS, OFFICERS, EM-
PLOYEES ORAGENTS BE LIABLE FORANYINDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIALDAMAGES (INCLUDINGDAMAGESFORLOSSOFPROFITS,LOSS
OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE
LIKE), EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAM-
AGES 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.
• SiS is a trademark of Silicon Integrated Systems Corp.
• Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated.
• Sound Blaster is a registered trademark of Creative Technology Ltd.
• Intel, LANDesk, and Pentium are registered trademarks of Intel Corporation.
• Symbios is a registered trademark of Symbios Logic Corporation.
• Windows and MS-DOS are registered trademarks of Microsoft Corporation.
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 MANUALARE 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
ANYERRORSORINACCURACIESTHATMAYAPPEARINTHIS MANUAL, INCLUD-
ING THE PRODUCTSAND SOFTWARE DESCRIBED IN IT.
Copyright © 1999 ASUSTeK COMPUTER INC. All Rights Reserved.
Product Name: ASUS P5-99B
Manual Revision: 1.02 E402
Release Date: June 1999

ASUS P5-99B User’s Manual 3
ASUS CONTACT INFORMATION
ASUSTeK COMPUTER INC. (Asia-Pacific)
Marketing
Address: 150 Li-Te Road, Peitou, Taipei, Taiwan 112
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support
Tel (English): [phone] ext. 706
Tel (Chinese): [phone] ext. 111
Fax: [phone]
Email: [email protected]
Newsgroup: news2.asus.com.tw
WWW: www.asus.com.tw
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER INTERNATIONAL (America)
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 (Europe)
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

4ASUS P5-99B User’s Manual
CONTENTS
I. INTRODUCTION.............................................................................. 7
How this Manual is Organized ........................................................... 7
Item Checklist ..................................................................................... 7
II. FEATURES ....................................................................................... 8
ASUS P5-99B Motherboard ............................................................... 8
Parts of the ASUS P5-99B Motherboard .......................................... 11
III. HARDWARE SETUP.................................................................... 12
ASUS P5-99B Motherboard Layout................................................. 12
Hardware Setup Steps ....................................................................... 15
1. Motherboard Settings.................................................................... 15
Compatible Cyrix CPU Identification .................................. 23
2. System Memory (DIMM) ............................................................. 25
DIMM Memory Installation Procedures: ............................. 26
3. Central Processing Unit (CPU).................................................... 27
4. Expansion Cards .......................................................................... 29
Expansion Card Installation Procedure: ............................... 29
Assigning IRQs for Expansion Cards................................... 29
Assigning DMA Channels for ISA Cards............................. 30
ISA Cards and Hardware Monitor ........................................ 30
5. External Connectors..................................................................... 31
Power Connection Procedures .................................................... 43
IV. BIOS SETUP................................................................................... 44
Flash Memory Writer Utility ............................................................ 44
Main Menu .................................................................................. 44
Managing and Updating Your Motherboard’s BIOS................... 46
6. BIOS Setup .................................................................................. 47
Load Defaults ....................................................................... 48
Standard CMOS Setup ................................................................ 48
Details of Standard CMOS Setup......................................... 48
BIOS Features Setup ................................................................... 51
Details of BIOS Features Setup............................................ 51
Chipset Features Setup ................................................................ 54
Details of Chipset Features Setup......................................... 54
Power Management Setup........................................................... 57
Details of Power Management Setup ................................... 57
PNP and PCI Setup ..................................................................... 60
Details of PNP and PCI Setup .............................................. 60

ASUS P5-99B User’s Manual 5
CONTENTS
Load BIOS Defaults .................................................................... 62
Load Setup Defaults .................................................................... 62
Supervisor Password and User Password ................................... 63
IDE HDD Auto Detection ........................................................... 64
Save & Exit Setup ....................................................................... 65
Exit Without Saving .................................................................... 65
V. SOFTWARE SETUP ....................................................................... 69
Operating Systems ............................................................................ 69
Windows 98 First Time Installation ............................................ 69
P5-99B Support CD .......................................................................... 70
Installation Menu ........................................................................ 70
Install ASUS PC Probe Vx.xx .......................................................... 71
Install VGA Driver............................................................................ 72
Install Audio Driver (only with onboard audio option) .................... 73
Install ESS AudioRack32 (only with onboard audio option) ........... 74
Install ESS Software Wave Table
(only with onboard audio option)................................................ 75
Install PC-Cillin 98 Vx.xx ................................................................ 76
Install ADOBE AcroBat Reader Vx.x .............................................. 77
Install Bus Master IDE Driver .......................................................... 78
Uninstalling Programs ...................................................................... 79
VI. SOFTWARE REFERENCE.......................................................... 81
ASUS PC Probe ................................................................................ 83
SiS 530 Display Properties ............................................................... 88
AudioRack32 .................................................................................... 91
Desktop Management Interface (DMI)........................................... 100
VII. APPENDIX.................................................................................. 103
The ASUS PCI-L101 Fast Ethernet Card ....................................... 103

6ASUS P5-99B User’s Manual
FCC & DOC COMPLIANCE
FederalCommunicationsCommission 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.
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! Any changes or modifications to this product not expressly ap-
proved by the manufacturer could void any assurances of safety or performance
and could result in violation of Part 15 of the FCC Rules.
CanadianDepartmentof Communications Statement
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.
This Class B digital apparatus complies with Canadian ICES-003.
CetappareilnumériquedelaclasseBestconformeàlanormeNMB-003duCanada.

ASUS P5-99B User’s Manual 7
I. INTRODUCTION
I.INTRODUCTION
Sections/Checklist
How this Manual is Organized
Item Checklist
Check that your package is complete. If you discover damaged or missing items,
contact your retailer.
(1) ASUS Motherboard
(1) Ribbon cable for master and slave IDE drives
(1) Ribbon cable for (1) 5.25” and (2) 3.5” floppy disk drives
(1) Ribbon cable for VGA with mounting bracket
(1) Connector set for PS/2 mouse and parallel port
(1) Connector set for serial ports
(1) Bag of spare jumpers
(1) Support CD with drivers and utilities
(1) Motherboard User’s manual
Connector set for audio input/output and game/MIDI port (with audio chip
onboard)
ASUS IrDA-compliant module (optional)
ASUS PCI-L101 Wake-On-LAN 10/100 ethernet card (optional)
Introduction Manual information and checklist
Features Information on motherboard features
Installation Instructions on motherboard/jumper setup
BIOS Setup Instructions on BIOS software setup
Software Setup Information on the included support software
Software Reference References for the included support software
Appendix Optional items and reference
I.
II.
III.
IV.
V.
VI.
VII.

8ASUSP5-99BUser’sManual
II. FEATURES
Features
II. FEATURES
ASUS P5-99B Motherboard
The ASUS P5-99B is carefully designed for the demanding PC user who wants ad-
vanced features in a small package.
Specifications
•SiS AGPset: SiS®(Silicon Integrated Systems Corp.) 530 AGPset with support for a
100MHzFrontSideBus (FSB),allcurrent Socket7processors andintegratedSuperAGP
2X 2D/3D VGAcontroller for high performance hardware 2D/3D VGAacceleration.
•Multi-Processor/Multi-Speed Support: AMD®K6®-2/266 & faster,AMD®K6®/166 &
faster, AMD®K5™/100–133, IBM®/Cyrix®6x86MX™/M II™(PR166 & faster), IBM®/
Cyrix®6x86-PR166+ (Rev 2.7 or later), Intel®Pentium®100–233MHz (P55C-MMX™,
P54C/P54CS).
•Multi-Cache: Features 512KB/1MB (when chip is available) pipelined-burst SRAM/
L2 memory cache and integrated Tag RAM to make using the 100MHz bus speed possible.
•PC100 Memory Support: Equipped with three DIMM sockets to support Intel PC100-
compliant SDRAMs (8, 16, 32, 64, 128, or 256MB) up to 768MB. These new SDRAMs
are necessary to meet the enhanced 95MHz/100MHz bus speed requirement.
•AGP2X VGAOnboard: SiS 530 built-in 2D/3DAGPVGA(onAGPset) with capa-
bility to use shared system memory or optional 8MB SDRAM as local graphics
memory.
•Peripheral Wake Up: Supports modem wake up, keyboard wake up, and LAN card
wake up functions from sleep or soft-off mode.
•Onboard Audio (optional): Provides ESS®Solo-1 PCI audio chipset with 3D sur-
round and positioning capability and audio CODEC that conforms to AC’97 analog
component specifications. Includes complete online software guide.
•PCHealth Monitoring: Provides an easier and convenient way to examine and man-
age system status information, such as CPU and system voltages, temperatures, and
fan status through the onboard PCIset (South Bridge) and the bundled PC Probe from
ASUS.
•UltraDMA/66 BM IDE: Comes with an onboard PCI Bus Master IDE controller with
two connectors that support four IDE devices in two channels, supports UltraDMA/66,
UltraDMA/33, PIO Modes 3/4 and Bus Master IDE DMA Mode 2, and supports En-
hancedIDEdevices,suchasTapeBackup,CD-ROM,CD-R,CD-RW,andLS-120 drives.
•Wake-On-LAN: Supports Wake-On-LAN activity through an optional ASUS PCI-
L101 10/100 Fast Ethernet PCI card (see APPENDIX) or a similar ethernet card.
• Multi-I/O: Provides two high-speed UART compatible serial ports and one parallel
port with EPP and ECP capabilities. UART2 can also be directed from COM2 (with
SIR) to the Infrared Module for wireless connections.
•USB: Supports the Universal Serial Bus standard through the onboard connectors for
multi-device connections.
•IrDA: Supports an optional infrared port module for a wireless interface.

ASUS P5-99B User’s Manual 9
II. FEATURES
II. FEATURES
Smart Series
Special Features
•Enhanced ACPI and Anti-Boot Virus BIOS: Features a programmable BIOS,
offering enhanced ACPI for Windows 98 compatibility, built-in firmware-based
virus protection through Trend ChipAway Virus codes, and autodetection of most
devices 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.) (See SOFTWARE
REFERENCE.)
• 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 of this motherboard meet
PC’98 compliancy.The new PC’98 requirements for systems and components are
based on the following high-level goals: Support for Plug and Play compatibility
and power management for configuring and managing all system components,
and 32-bit device drivers and installation procedures for Windows 95/98/NT.
•Symbios SCSI BIOS: Supports optional ASUS SCSI controller cards or other
Symbios SCSI cards through the onboard SYMBIOS firmware.
Performance Features
•Concurrent PCI: Concurrent PCI allows multiple PCI transfers from PCI mas-
ter busses to the memory and processor.
• High-SpeedDataTransferInterface:This motherboard with itschipset and sup-
port for UltraDMA/66 doubles the UltraDMA/33 burst transfer rate to 66.6MB/s.
UltraDMA/66 is backward compatible with both DMA/33 and DMA and with
existing DMA devices and systems so there is no need to upgrade current EIDE/
IDE drives and host systems. (UltraDMA/66 requires a 40-pin 80-conductor cable
to be enabled and/or for UltraDMA Mode 4.)
• SDRAM Optimized Performance: Supports the new generation memory —
Synchronous Dynamic Random Access Memory (SDRAM) — which increases
the data transfer rate to 800MB/s max using PC100-compliant SDRAM.
Intelligent Features
• Fan Status Monitoring and Alarm: To prevent system overheat and system
damage, the CPU and chassis fans are monitored for RPM and failure. Each fan
can be set for its normal RPM range and alarm thresholds.
•TemperatureMonitoringandAlert:Toavoid any failures triggeredbyextremely
high temperature, there is a heat sensor under the CPU to make sure your system
is operating at a safe heat level.

10 ASUSP5-99BUser’sManual
II. FEATURES
Smart Series
II. FEATURES
• AutoFan Off:The system fans will power off automatically eveninsleep mode.
This function reduces both energy consumption and system noise, and is an im-
portant feature in implementing silent PC systems.
• Dual Function PowerButton(requiresATXpowersupply): Pushing the power
button for less than 4 seconds 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 BIOS SETUP). When the
power button is pressed for more than 4 seconds, the system enters the soft-off
mode regardless of the BIOS setting.
• Keyboard Power Up: Keyboard Power Up can be enabled or disabled to allow
the computer to be powered on by pressing the keyboard’s spacebar.
•Voltage Monitoring and Alert: System voltage levels are monitored to ensure
stable current to critical motherboard components.Voltage specifications are more
critical for future processors, so monitoring is necessary to ensure proper system
configuration and management.
• 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 on managing the user’s limited resources more
efficiently are provided.
• CPU Slow Down: When CPU fans or system fans malfunction, the system will
deactivate the CPU Clock line to decrease CPU utilization to the speed upon
detection of system overheat. This will prevent CPU damage from system over-
heat. The CPU utilization will restore normal operations when temperature falls
below a safe level.
• Remote Ring On (requires external modem): This feature allows a computer to
be turned on remotely through an external modem. With this benefit on hand, any
user can access vital information from their computer from anywhere in the world!
• Message LED (requires ACPI-supported OS): Turbo LEDs now act as infor-
mation providers. Through the way a particular LED illuminates, the user can
determine the stage the computer is in. A simple glimpse provides useful infor-
mation to the user.

ASUS P5-99B User’s Manual 11
Parts of the ASUS P5-99B Motherboard
II. FEATURES
II. FEATURES
Motherboard Parts
87654321
22
21
19
20
18
17
16
14 13 12 1015 9
11
1Parallel Port Connector
2AT Power Connector
3ATX Power Connector
4VGA Header
58MB VGA Memory (optional)
6SiS AGPset with Heatsink
7DIMM Sockets
8CPU ZIF Socket 7
9Panel Connectors
10 Audio Connector (with audio chip
onboard)
11 PCI Audio (ESS Solo-1) (optional)
12 IDE Connectors
13 SiS Super South Bridge with Built-
in Hardware Monitoring
14 ISA Slots
15 Wake-On-LAN Connector
16 Super Multi I/O Chip
17 Programmable Flash ROM (2Mbit)
18 PCI Slots
19 PS/2 Mouse, USB, IR Connector
20 Floppy Disk Drive Connector
21 Serial Port Connectors
22 Keyboard Connector

12 ASUSP5-99BUser’sManual
III. HARDWARE SETUP
ASUS P5-99B Motherboard Layout
Motherboard Layout
III. H/WSETUP
01
DIMM Socket 2 (64/72-bit, 168-pin module)
DIMM Socket 3 (64/72-bit, 168-pin module)
DIMM Socket 1 (64/72-bit, 168-pin module)
Row
2
3
4
5
0
1
ISA Slot 1 (Slot1)
2 MB
SDRAM
SECONDARY IDE
PRIMARY IDE
FLOPPY
CHA_FAN
2 MB
SDRAM
2 MB
SDRAM
ATX Power Connector
Panel
CPU ZIF Socket 7
PCI Slot 1 (PCI1)
PCI Slot 2 (PCI2)
PCI Slot 3 (PCI3)
ISA Slot 2 (Slot2)
PCI Slot 4 (PCI4)
2Mbit Flash EEPROM
(Programmable BIOS)
SiS 530
Chipset
(AGP VGA
built in)
SiS5595
with Hardware
Monitor
2 MB
SDRAM
Multi I/O
CR2032 3V
Lithium Cell
CMOS Power
512KB/
1024KB
Pipelined
Burst L2
Cache
IR
IDELED
CD2CD1
MODEM
COM 1 COM 2
Parallel Port
DIP Switches
(DIP2)
DIP Switches
(DIP 1)
KB
PWR_FAN
CPU_FAN
PS/2PWR
P8
P9
USB/MIR
ESS
Audio
Chip
1024KB
Pipelined
Burst L2
Cache
AUX
KB_UP
WOL_CON
CLRTC
SMB
WOR
Audio Connectors
VGA
Header
Thermal Sensor
Dimmed components are optional.

III. HARDWARE SETUP
ASUS P5-99B User’s Manual 13
Motherboard Feature Settings
1) KB_UP p. 16 Keyboard Power (Wake) Up (Enable/Disable)
2) DIP 1 – Switch 1 p. 17 VGA Frame Buffer Setting (Shared/Local)
3) DIP 1 – Switch 2 p. 17 Onboard VGA Setting (Enable/Disable)
4) DIP 1 – Switch 3 p. 18 Onboard Audio Setting (Enable/Disable)
5) DIP 1 – Switches 4, 5 p. 18 VIO Setting
6) DIP 2 – Switches 1, 2, 3, 4 p. 19 CPU BUS Frequency Setting
7) DIP 2 – Switch 5 p. 19 Memory Transfer Mode Setting
8) DIP 2 – Switches 6, 7, 8 p. 20 CPU Core:BUS Frequnecy Multiple Setting
9) DIP 1 – Switches 6, 7, 8, 9, 10 p. 21 Voltage Regulator Output Selection
Expansion Slots/Sockets
1) DIMM Sockets p. 25 168-Pin DIMM Memory Expansion Sockets
2) CPU ZIF Socket 7 p. 27 Central Processing Unit (CPU) Socket
3) SLOT 1, SLOT 2 p. 29 16-bit ISA Bus Expansion Slots
*
4) PCI 1, PCI2, PCI3, PCI4 p. 29 32-bit PCI Bus Expansion Slots
*
The onboard hardware monitor uses the address 290H-297H so legacy ISA cards must not
use this address or else conflicts will occur.
External Connectors
1) PS2KB p. 31 AT Keyboard Connector (5-pin Female)
2) FLOPPY p. 31 Floppy Disk Drive Connector (6-pin Female)
3) PARALLEL p. 32 Parallel Port Connector (26-1 pins)
4) COM1/COM2 p. 32 Serial Port Connectors (Two 10-1 pins)
5) FAN p. 33 Cooling Fan Connectors (3 pins)
6) SMB p. 33 SMBus Connector (5-1 pins)
7) PRIMARY/SECOND.IDE p. 34 Primary/Secondary IDE Connector (Two 40-1 pins)
8) IDELED p. 34 IDE Activity LED (2 pins)
9) ATXPWR p. 35 ATX Power Supply Connector (20 pins)
10) PS2PWR p. 35 AT Power Supply Connector (12 pins)
11) USBMIR p. 36 USB,PS/2Mouse,InfraredModuleConnector(18-1pins)
12) IR p. 36 IrDA-Compliant Infrared Module Connector (5 pins)
13) PWR (PANEL) p. 37 ATX Power Switch/Soft Power Switch Lead (2 pins)
14)
SMI ( PANEL ) p. 37 System Management Interrupt Switch Lead (2 pins)
15)
PLED ( PANEL ) p. 37 System Power LED Lead (2 pins)
16) RESET (PANEL) p. 37 Reset Switch Lead (2 pins)
17) MLED (PANEL) p. 37 System Message LED (2 pins)
18)
KEYLOCK ( PANEL ) p. 37 Keyboard Lock Switch Lead (2 pins)
19) SPEAKER (PANEL) p. 37 Speaker Output Connector (4 pins)
20) WOLCON p. 38 Wake-On-LAN Activity Connector (3 pins)
Contents
III.H/WSETUP

III. HARDWARE SETUP
ASUS P5-99B User’s Manual14
Contents
III.H/WSETUP
21) WOR p. 38 Wake-On-Ring Connector (2 pins)
22) AUX, CD1, CD2 p. 39 Stereo Audio In Connector (4 pins)
23) MODEM p. 39 Voice Modem In Connector (4 pins)
24) AUDIOCON p. 39 Audio Header (26-1 pins)
25) VGA Header p. 41 VGA Header (16 pins)

III. HARDWARE SETUP
ASUS P5-99B User’s Manual 15
Hardware Setup Steps
1. Check Motherboard Settings
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. Motherboard Settings
This section explains how to change your motherboard’s function settings through
the use of switches and/or jumpers.
WARNING!Computer motherboards, baseboards and components, such as SCSI
cards, contain very delicate Integrated Circuit (IC) chips. To protect them against
damage from static electricity, 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.

III. HARDWARE SETUP
ASUS P5-99B User’s Manual16
Motherboard Settings
III.H/WSETUP
Motherboard Feature Settings (DIP Switches – DIP1 & DIP 2)
Some of the motherboard’s onboard functions can be adjusted through the DIP
switches. The white block represents the switch’s position. The following illustra-
tion shows all the switches in the OFF position.
P5-99B DIP Switches
0 1
DIP 2
DIP 1
ON
12345678910
<(Reserved)
<(Reserved)
<Frequency Multiple
<Frequency Multiple
<Frequency Multiple
<Memory Transfer Mode
<Frequency Selection
<Frequency Selection
<Frequency Selection
<Frequency Selection
ON
12345678910
<VGA Frame Buffer <Onboard VGA Setting <Onboard Audio Setting <VIO Setting <VIO Setting <VID Setting <VID Setting <VID Setting <VID Setting <VID Setting
OFFON
OFF
ON
1. Keyboard Power (Wake) Up (KB_UP)
This allows you to disable or enable the keyboard power or wake up function. Set
to Enable if you want to use your keyboard (by pressing <Spacebar>) to power or
wake up your computer. The default is set to Disable because not all computers
have the appropriate ATX power supply.
P5-99B Keyboard Power Up
Disable
(Default)
KBPWR
Enable
123
123
0 1

III. HARDWARE SETUP
ASUS P5-99B User’s Manual 17
III.H/WSETUP
Motherboard Settings
2. VGA Frame Buffer Setting (DIP 1 – Switch 1)
This lets you select the display memory allocation mode. When Shared is se-
lected, the integrated graphics accelerator uses up to 8MB of system memory as
display memory. Local uses an optional dedicated onboard VGAmemory (up to
8MB SDRAM).
ON
12345678910
ON
12345678910
P5-99B VGA Frame Buffer Setting
DIP 1
Shared Local
0 1
3. Onboard VGASetting (DIP 1 – Switch 2)
This lets you enable or disable the onboardAGP VGA. This may be disabled if
you are using a VGA card on the expansion slot.
P5-99B OnboardVGA Setting
DIP 1
ON
12345678910
Disable
ON
12345678910
Enable
(Default)
0 1

III. HARDWARE SETUP
ASUS P5-99B User’s Manual18
Motherboard Settings
III.H/WSETUP
4. Onboard Audio Setting (DIP 1-Switch 3)
Thislets you enable or disable the optional onboard 32-bit PCI audio.Thisshould
be disabled if you are using an audio card on the expansion slot.
.
P5-99B Audio Setting
DIP 1
Enable
(Default) Disable
0 1
ON
12345678910
ON
12345678910
5. VIO Setting (DIP 1-Switches 4, 5)
The onboard voltage regulator allows you to select the voltage supplied to the
DRAM, chipset, AGP, and the CPU’s I/O buffer. IMPORTANT! Setting this
function switch to 3.6V or 3.8V may reduce system life. It is strongly recom-
mended that you leave your switch on its default setting of 3.5V.
P5-99B Voltage I/O Setting
DIP 1
0 1
3.6Volt
ON
12345678910
3.8Volt
ON
12345678910
3.5Volt
(Default)
ON
12345678910

III. HARDWARE SETUP
ASUS P5-99B User’s Manual 19
Motherboard Settings
III.H/WSETUP
6. CPU BUS Frequency Setting (DIP 2 – Switches 1, 2, 3, 4)
This option tells the clock generator what frequency to send to the CPU, chipset,
andAGPset. 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
frequency (the advertised CPU speed). NOTE: You may set the memory speed
independently from the CPU Bus Frequency. Depending on your memory type,
PC66 (66MHz) ot PC100 (100MHz), select the appropriate “RAM” speed along
with the appropriate “CPU” speed.
7. Memory Transfer Mode Setting (DIP2 – Switch 5)
The memory clock frequency can be set to be in asynchronous or synchronous
mode with respect to the CPU bus frequency.
P5-99B
CPU Bus Frequency Setting
75MHz
75MHz
37MHz
66MHz
66MHz
33MHz
100MHz
100MHz
33MHz
CPU
SDRAM
PCI
112MHz
112MHz
37MHz
105MHz
105MHz
35MHz
0 1
90MHz
90MHz
30MHz
95MHz
95MHz
32MHz
75MHz
100MHz
37MHz
66MHz
100MHz
33MHz
100MHz
66MHz
33MHz
CPU
SDRAM
PCI
112MHz
74MHz
37MHz
105MHz
70MHz
35MHz
90MHz
60MHz
30MHz
95MHz
63MHz
32MHz
DIP 2
ON
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CPU
SDRAM
PCI
CPU
SDRAM
PCI
(SYNC)
(SYNC)
(ASYNC)
(ASYNC)

III. HARDWARE SETUP
ASUS P5-99B User’s Manual20
Motherboard Settings
III.H/WSETUP
8. CPU Core:BUS Frequency Multiple Setting (DIP 2 – Switches 6, 7, 8)
This option sets the frequency multiple between the CPU’s Internal frequency
and External frequency. These must be set in conjunction with the CPU BUS
Frequency Setting.
0 1
P5-99B CPU
BUS Frequency Multiple
CPU A: AMD-K6-2,AMD-K6
CPU B: Intel Pentium P54C,AMD-K5
CPU C: Intel Pentium P55C, IBM/Cyrix
6x86MX, IBM/Cyrix M II
CPU D: IBM/Cyrix 6x86, IBM/Cyrix 6x86L
CPU E: IDT WinChip 2™
CPU F: IDT WinChip C6
CPU A
CPU B
CPU C
CPU D
CPU E
CPU F
→
→
→
→
→
→
DIP 2
3.5x(7/2)
1.5x(3/2)
3.5x(7/2)
3.0x(3/1)
3.5x(7/2)
4.0x(4/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
3.33x(10/3)
2.0x(2/1)
2.5x(5/2)
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
2.5x(5/2)
2.0x(2/1)
3.0x(3/1)
3.0x(3/1)
3.0x(3/1)
—
3.0x(3/1)
3.0x(3/1)
ON
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4.0x(4/1)
—
—
—
4.0x(4/1)
4.0x(4/1)
ON
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4.5x(9/2)
—
—
—
4.5x(9/2)
4.0x(4/1)
ON
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5.0x(5/1)
—
—
—
2.33x(7/3)
5.0x(5/1)
5.5x(11/2)
—
—
—
2.66x(8/3)
5.0x(5/1)
ON
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CPU A
CPU B
CPU C
CPU D
CPU E
CPU F
→
→
→
→
→
→
See next page for a table of the CPU BUS Frequency and CPU Core:BUS Fre-
quency Multiple Settings of supported CPUs.
WARNING! Frequencies above 100MHz exceed the specifications for the on-
board chipset and are not guaranteed to be stable. The table on the following
page is for general reference purposes only. Always refer to the instructions
included with your CPU when possible.