Asus Pentium TX97-X User manual

R
TX97-X
Pentium®ATX Motherboard
USER'S MANUAL

ASUS TX97-X User's Manual
2
USER'S NOTICE
Product Name: ASUS TX97-X
Manual Revision: 2.03
Release Date: March 1997
No part of this product, including the product and software may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any lan-
guageinanyformbyanymeanswithouttheexpresswrittenpermissionofASUSTeK
COMPUTER INC. (hereinafter referred to as ASUS) except documentation kept
by the purchaser for backup purposes.
Specifications are subject to change without notice. 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 merchantability or fitness for a
particular purpose. In no event shallASUS be liable for any loss or profits, loss of
business, loss of use or data, interruption of business, or for indirect, special, inci-
dental, or consequential damages of any kind, even if ASUS has been advised of
the possibility of such damages arising from any defect or error in this manual or
product. ASUS may revise this manual from time to time without notice.
Products mentioned in this manual are mentioned for identification purposes only.
Product names appearing in this manual may or may not be registered trademarks
or copyrights of their respective companies.
• 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.
• Sound Blaster AWE32 and SB16 are trademarks of Creative Technology Ltd.
• Adobe andAcrobat are registered trademarks of Adobe Systems Incorporated.
The product name and revision number are both printed on the board itself. Manual
revisions are released for each board 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 you may visit ASUS' home page at:
http://www.asus.com.tw/ or contact ASUS from the following page.
© Copyright 1997 ASUSTeK COMPUTER INC. All rights reserved.

ASUS TX97-X User's Manual 3
ASUS CONTACT INFORMATION
ASUSTeK COMPUTER INC.
Marketing Info:
Address: 150 Li-Te Road, Peitou, Taipei, Taiwan, ROC
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support:
Fax: [phone]
BBS: 886-2-896-4667
Email: [email protected]
WWW: http://www.asus.com.tw/
Gopher: gopher.asus.com.tw
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER INTERNATIONAL
Marketing Info:
Address: 721 Charcot Avenue, San Jose, CA 95131, USA
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support:
BBS: 1-408-474-0555
Email: [email protected]
ASUS COMPUTER GmbH
Marketing Info:
Address: Harkort Str. 25, 40880 Ratingen, BRD, Germany
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support:
BBS: 49-2102-448690
Email: [email protected]

ASUS TX97-X User's Manual
4
CONTENTS
I. INTRODUCTION...........................................................................7
How this manual is organized..........................................................7
Item Checklist ..................................................................................7
II. FEATURES ....................................................................................8
Features of the ASUS TX97-X Motherboard ..................................8
Introduction to ASUS TX97 Series of motherboards ................9
Parts of the ASUS TX97-X Motherboard ................................ 11
III. INSTALLATION ........................................................................12
Map of the ASUS Motherboard .....................................................12
Installation Steps............................................................................14
1. Jumpers ......................................................................................14
Jumper Settings ..................................................................15
Compatible Cyrix CPU Identification ................................19
2. System Memory (DIMM) .........................................................21
DIMM Memory Installation Procedures: ...........................22
3. Central Processing Unit (CPU).................................................23
4. Expansion Cards .......................................................................24
Expansion Card Installation Procedure: .............................24
Assigning IRQs for Expansion Cards.................................24
Assigning DMA Channels for ISA Cards...........................25
5. External Connectors..................................................................26
Power Connection Procedures .................................................33
IV. BIOS SOFTWARE .....................................................................34
Support Software ...........................................................................34
Flash Memory Writer Utility .........................................................34
Main Menu .........................................................................34
Advanced Features Menu ...................................................35
Managing & Updating your Motherboard's BIOS ...................36
6. BIOS Setup ...............................................................................37
Load Defaults .....................................................................38
Standard CMOS Setup .............................................................38
Details of Standard CMOS Setup:......................................39
BIOS Features Setup ................................................................42
Details of BIOS Features Setup..........................................42
Chipset Features Setup .............................................................45
Details of Chipset Features Setup.......................................45
Power Management Setup........................................................48
Details of Power Management Setup .................................48
PNP and PCI Setup ..................................................................50
Details of PNP and PCI Setup ............................................50
Load BIOS Defaults .................................................................52

ASUS TX97-X User's Manual 5
CONTENTS
Load Setup Defaults .................................................................52
Supervisor Password and User Password ................................53
IDE HDD Auto Detection ........................................................54
Save and Exit Setup .................................................................55
Exit Without Saving .................................................................55
V. SUPPORT SOFTWARE..............................................................56
ASUS TX97 Motherboard Series Support CD ..............................56
LANDesk Client Manager (LDCM)..............................................56
Desktop Management Interface (DMI)..........................................58
Introducing the ASUS DMI Configuration Utility .............58
System Requirements .........................................................58
Using the ASUS DMI Configuration Utility ......................59
Notes:..................................................................................59
VI. ASUS PCI-SC200 SCSI Card....................................................61
SCSI BIOS and Drivers .................................................................61
The ASUS PCI-SC200 SCSI Interface Card .................................62
Setting Up the ASUS PCI-SC200 ............................................62
Setting the INTAssignment .....................................................63
Terminator Settings ..................................................................63
SCSI ID Numbers ....................................................................64
The Following Sections are Available with Optional Audio Only
Creative Labs ViBRA 16C Series .......................................................1
Audio Drivers Installation ..................................................................3
Manual Information ...................................................................3
ASUS Installation CD ................................................................3
ASUS Audio Driver CD Contents ........................................3
Win95 Audio Drivers...........................................................................4
3D Sound....................................................................................5
Win3.x Audio Drivers..........................................................................7
Configuration Manager ..............................................................7
Creative PnP Configuration Manager (CTCM) .........................7
ASUS 3D Sound ........................................................................8
Audio Software ..........................................................................9
3D Sound..................................................................................13
Environment Variables .............................................................15
SOUND Environment variable...........................................15
BLASTER Environment Variable ......................................15
MIDI Environment Variable...............................................16
Maximum Recording Rates for the Audio Hardware.........16
Windows 95 Software.......................................................................... I
DOS & Windows 3.x Software ........................................................... I

ASUS TX97-X User's Manual
6
FCC & DOC COMPLIANCE
FederalCommunications 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.
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: Theuseofshieldedcablesforconnectionof the monitor to the graphics
card is required to assure compliance with FCC regulations. Changes or modifica-
tions to this unit not expressly approved by the party responsible for compliance
could void the user's authority to operate this equipment.
CanadianDepartment of CommunicationsStatement
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 TX97-X User’s Manual 7
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.
IV. BIOS Setup: BIOS software setup information.
V. DMI Utility: BIOS supported Desktop Management Interface
VI. ASUS PCI-SC200: Installation of an optional Fast-SCSI card.
VII. Windows 95: Audio Software Section (optional)
VIII. DOS/Win3.1x: Audio Software Section (optional)
Item Checklist
Please check that your package is complete. If you discover damaged or missing
items, please contact your retailer.
√The ASUS TX97-X motherboard
√1 IDE ribbon cable
√1 floppy ribbon cable
√Support drivers and utilities as follows (view FILELIST.TXT for details)
• LANDesk Client Manager (LDCM) Software
• Flash Memory Writer utility to update the FLASH BIOS
• Desktop Management Interface (DMI) utility
• Audio drivers and utilities (optional)
• Readme files for descriptions and use of the files
• Technical Support Form
√This user's manual
Optional infrared module
Optional ASUS PCI-SC200 Fast-SCSI card
I. INTRODUCTION
I. INTRODUCTION
(Manual / Checklist)

8 ASUS TX97-X User’s Manual
Features of the ASUS TX97-X Motherboard
The ASUS TX97-X is carefully designed for the demanding PC user who wants
many many features in a small package. This motherboard:
•Intel Chipset: Features Intel's 430TX PCIset with I/O subsystems.
•Multi-Processor/Multi-SpeedSupport: IntelPentium
®
75-200MHz(P55C-MMX
™
,
P54C/P54CS), Cyrix
®
P166+ (Rev 2.7 & later),AMD-K5
™
(PR75-133MHz).
•Easy Installation: Is equipped with BIOS that supports auto detection of hard
drives, PS/2 mouse, and Plug and Play devices to make setup of hard drives,
expansion cards, and other devices virtually automatic.
•ISA and PCI Expansion Slots: Provides four 16-bit ISA slots, and four 32-bit
PCI slots.
•Super 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 to the Infrared Module for wireless connections. Two floppy drives
of either 5.25" or 3.5" (1.44MB or 2.88MB) are also supported without an exter-
nal card. Supports Japanese standard "Floppy 3 mode" (3.5" 1.2MB).
• 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 section V)
•PCI Bus Master IDE Controller: Comes with an onboard Ultra DMA/33
Bus Master IDE controller with two connectors that supports four IDE devices
in two channels up to 33MB/sec IDE transfers and supports Enhanced IDE de-
vices. This controller supports PIO Modes 3 and 4 and Bus Master IDE DMA
Mode 2. BIOS now supports IDE CD-ROM or SCSI bootup.
•Level 2 Cache: 512KB Pipelined Burst SRAM onboard.
•Versatile Memory Support: Is equipped with three DIMM sockets to support
(8, 16, 32, 64, or 128MB) 168-pin SDRAM memory modules up to 256MB.
•OptionalPS/2Mouse,USB,IrDAConnector: Supportsanoptionalcableandbracket
set to mount the connectors to an unused expansion slot on the system chassis. A
second IrDA connector is available for a standard individual infrared cable set.
•NCRSCSIBIOS: Has firmware tosupportoptionalASUS SCSI controllercards.
•Audio Ready: Optional Creative Labs 16C Series Audio with 3D sound.
•Optional IrDA Connector: This motherboard supports an optional infrared
port module for wireless interface.
II. FEATURES
(Features)
II. FEATURES

ASUS TX97-X User’s Manual 9
II. FEATURES
II. FEATURES
(TX97 Series)
Introduction to ASUS TX97 Series of motherboards
Performance:
• SDRAM Optimized Performance - ASUS TX97 series of motherboards sup-
port the new generation memory - Synchronous Dynamic Random Access
Memory (SDRAM) which increases the data transfer rate from 264MB/s max
using EDO memory to 528MB/s max.
• Double the IDE Transfer Speed - ASUS TX97 series of motherboards with
Intel 430TX PCIset 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 technology is compatible with existing ATA-2 IDE specs so there is no
need to upgrade current hard drives or cables.
•ConcurrentPCI-ConcurrentPCIallowsmultiplePCI transfers from PCI master
busses to memory to CPU.
• ACPI Ready - ACPI (Advanced Configuration and Power Interface) is also
implemented on all ASUS 430TX series of motherboards. ACPI provide more
Energy Saving Features for the future operating systems (OS) supporting OS
Direct Power Management (OSPM) functionality. With these features imple-
mented in the OS, PCs can be ready around the clock everyday, yet satisfy all
the energy saving standards. To fully utilize the benefits of ACPI, an ACPI-
supported OS such as in the next release of Windows 95 must be used.
• PC ’97 Compliant - Both the BIOS and hardware levels ofASUS TX97 series
of motherboards meet PC ’97 compliancy. The new PC 97 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 pro-
cedures for both Windows 95 and Windows NT.
Intelligence:
• Fan Status Monitoring and Alarm - To prevent system overheat and system
damage, the CPU fan and system fans are monitored for RPM and failure. Each
fan can be set for its normal RPM range and alarm thresholds.
•Temperature Monitoring andAlert - To prevent system overheat and system
damage, there is a heat sensor under the CPU and on the motherboard itself to
monitor CPU and system temperature to make sure the system is operating at a
safe heat level to avoid any failures triggered by extremely high temperature.

10 ASUS TX97-X User’s Manual
II. FEATURES
(TX97 Series)
II. FEATURES
•Voltage Monitoring andAlert - 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.
• SystemResourcesAlert -Today’s operating systems such asWindows 95, Win-
dows NT, and OS/2, require much more memory and hard drive space to present
enormous user interfaces and run large applications. The system resource moni-
tor will warn the user before the system resources are used up to prevent pos-
sible application crashes. Suggestions will give the user information on manag-
ing their limited resources more efficiently.
• Virus Write Protection - Normally, viruses can destroy data on storage media
such as hard drivers, floppy diskettes, and MO. Some new-generation viruses
will not only destroy data on storage media, but also clear BIOS data which is
usually unprotected. ASUS TX97 series of motherboards were designed to co-
operate with BIOS, chipset, and flash EPROM to disable write permission when
the system’s initialization stage is completed upon boot-up.
• CPU Slow Down - When CPU fans or system fans are malfunctioning, 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 overheat. The CPU utilization will restore normal operations when tem-
perature falls below a safe level.
• 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 a important feature to implement silent PC systems.
• Dual Function Power Button (requiresATX power supply) -The system can
be in one of two states, one is Sleep mode and the other is the Soft-Off mode.
Pushing the power button for less than 4 seconds places the system into Sleep
mode. When the power button is pressed for more than 4 seconds, it enters the
Soft-Off mode.
• Remote Ring On (requiresATX powersupply) - This allows a computer to be
turned on remotely through a modem. With this benefit on-hand, any user can
access vital information from their computer from anywhere in the world!
• Message LED - Chassis LEDs now act as information providers. Through the
way a particular LED illuminates, the user can determine the stage the computer
is in. A simple glimpse provides useful information to the user.

ASUS TX97-X User’s Manual 11
Parts of the ASUS TX97-X Motherboard
II. FEATURES
II. FEATURES
(Parts of Board)
Intel's 430TX
PCIset
512KB Pipelined
Burst L2 Cache
CPU ZIF
Socket 7
4 PCI Slots
4ISA Slots
3 DIMM Sockets
T: USB Port 1
B: USB Port 2
Floppy Drive Connector
Programmable
Flash ROM
T: PS/2 Mouse
B: PS/2 Keyboard
T: Parallel Conn.
B: Serial Conn.
(Optional)
T:Joystick/Midi
B:1/8” Output/
Input/Mic
IDE 2 Connector
IDE 1 Connector
COM 1
COM 2
Hardware
Monitor
CPU Thermal
Sensor

12 ASUS TX97-X User’s Manual
III. INSTALLATION
Map of the ASUS Motherboard
Panel Connections
Board Power Input
for ATX Power Supply
Floppy Drives
ISA Slot 3
ISA Slot 2
ISA Slot 1
PCI Slot 1
ISA Slot 4
PCI Slot 2
PCI Slot 4
Secondary IDE Primary IDE
PCI Slot 3
256KB/512KB Onboard L2 Cache
CPU ZIF Socket 7
R
IDE LED
Infrared Con. (IrDA)
Multi-I/O (En/Dis)
SIO
Creative
®
Modem
Connector
CR2032
3 Volt
Lithium Cell
Top: USB 1
Bottom: USB 2
USB
PS/2 Top: Mouse
Bottom: Keyboard
FS0
FS1
FS2
BUS FREQ
Volume Control
VOLCTL
AUDIO (Dis/En)
Keyboard BIOS
Flash ROM
for BIOS
Block Program (Dis/En)
BBLKW
RTC (Test/Clear)
RTCLR
Sony
CD In
Panasonic
CD In
Mitsumi
CD In
DIMM Socket 3 DIMM Socket 1 DIMM Socket 2
Mic Line In Line Out
Intel
430TX
PCIset
Intel PIIX4
PCIset
Chasis open
alarm lead
Game/Midi Port
COM 1
Parallel Port
COM 2
BF0
BF1
BF2
BUS FREQ.
FANPWR1
12V
FANPWR2
12V
FANPWR3
12V
VID0
VID1
VID2
CPU Voltage
NOTE: The items in Outline are available only with the optional onboardAudio.
(Map of Board)
III. INSTALLATION

ASUS TX97-X User’s Manual 13
III. INSTALLATION
Jumpers
1) SIO p. 15 Multi-I/O Selection (Enable/Disable)
2) BBLKW p. 15 Flash ROM Boot Block Program (Disable/Enable)
3) AUDIO p. 16 Onboard Audio (Disable/Enable)
4) VOLCTL p. 16 Digital Volume Level Control (Up/Down)
5) RTCLR p. 17 Real Time Clock RAM (Operation/Clear Data)
6) FS0, FS1, FS2 p. 18 CPU External Clock (BUS) Frequency Selection
7) BF0, BF1 p. 18 CPU:BUS Frequency Ratio
8) VID0, VID1, VID2 p. 19 CPU Voltage Regulator Output Selection
Expansion Slots
1) DIMM Sockets p. 21 168-Pin DIMM Memory Expansion Sockets
2) CPU ZIF Socket 7 p. 23 Central Processing Unit (CPU) Socket
3) ISASlots p. 24 16-bit ISA Bus Expansion Slots
4) PCI Slots p. 24 32-bit PCI Bus Expansion Slots
Connectors
1) PS2KEYBOARD p. 26 PS/2 Keyboard Connector (6-pin Female)
2) PS2MOUSE p. 26 PS/2 Mouse Connector (6-pin Female)
3) PRINTER p. 27 Parallel (Printer) Port Connector (25-pin Female)
4) COM1, COM2 p. 27 Serial Port COM1 & COM2 (Two 9-pin Female)
5) AUDIO (optional) p. 27 Audio Port -Line Out, Line In, Mic (Three 1/8” Female)
6) GAME (optional) p. 28 Joystick/Midi Connector (15-pin Female)
7) USB p. 28 Universal Serial BUS Ports 1 & 2 (Two 4-pin Female)
8) FLOPPY p. 28 Floppy Drive Connector (34-pin Block)
9) FANPWR1, 2, 3 p. 29 1Chassis,2CPU,3PowerSupplyFanPowerLead(3-pinBlock)
10) CHASSIS p. 29 Chassis Open Alarm Lead (3-pin Block)
11) Primary / Second IDE p. 30 Primary / Secondary IDE Connector (40-pin Blocks)
12) IDELED p. 30 IDE LEDActivity Light
13) MSG LED (PANEL) p. 31 System Message LED (2-pins)
14) SMI (PANEL) p. 31 SMI Switch Lead (2-pins)
15) PWR SW (CON1) p. 31 ATX Power & Soft-Off Switch Lead (2-pins)
16) RESET (PANEL) p. 31 Reset Switch Lead (2-pins)
17) KEYLOCK (PANEL) p. 31 Keyboard Lock Switch Lead (5-pins)
18) SPEAKER (PANEL) p. 31 Speaker Output Connector (4-pins)
19) IR p. 32 Infrared Port Module Connector
20) ATXPWR p. 32 Motherboard Power Connector (20-pin Block)
(Map of Board)
III. INSTALLATION

14 ASUS TX97-X User’s Manual
III. INSTALLATION
(Jumpers)
III. INSTALLATION
Installation Steps
Before using your computer, you must complete the following steps:
1. Set Jumpers on the Motherboard
2. Install DRAM 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
Several hardware settings are made through the use of jumper caps to connect jumper
pins (JP) on the motherboard. See "Map of the Motherboard" on page 4 for loca-
tions of jumpers. The jumper settings will be described numerically such as [----],
[1-2], [2-3] for no connection, connect pins 1&2, and connect pins 2&3 respec-
tively. Pin 1 for our motherboards is always on top
Pin 1
or on the left
Pin 1
when
holding the motherboard with the keyboard connector away from yourself. A"1" is
written besides pin 1 on jumpers with three pins. The jumpers will also be shown
graphically such as to connect pins 1&2 and to connect pins 2&3.
Jumpers with two pins will be shown as for Short (On) and for Open
(Off). For manufacturing simplicity, the jumpers may be sharing pins from other
groups. Use the diagrams in this manual instead of following the pin layout on the
board. Settings with two jumper numbers require that both jumpers be moved to-
gether. To connect the pins, simply place a plastic jumper cap over the two pins as
diagramed.
WARNING: Computer motheboards and components contain very delicate
Integrated Circuit (IC) chips. To protect the motherboard and other compo-
nents against damage from static electricity, you should follow some precau-
tions whenever you work on your computer.
1. Unplug your computer when working on the inside.
2. Hold components by the edges and try not to touch the IC chips, leads, or
circuitry.
3. Use a grounded wrist strap before handling computer 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 TX97-X User’s Manual 15
III. INSTALLATION
Jumper Settings
1. Onboard Multi-I/O Selection (SIO)
You can selectively disable each onboard Multi-I/O item (floppy, serial, paral-
lel, and IrDA) through Chipset Features Setup of BIOS SOFTWARE or dis-
able all Multi-I/O items at once with the following jumper in order to use your
own Multi-I/O card.
Multi-I/O SIO
Enable [1-2] (Default)
Disable [2-3]
Multi I/O Setting (Enable / Disable)
Disabled
1
2
3
SIO
Enable (Default)
1
2
3
SIO
R
2. Flash ROM Boot Block Programming (BBLKW)
This sets the operation mode of the boot block area of the Programmable Flash
ROM to allow programming in the Enabled position. This is required only if
prompted by the FlashMemoryWriterUtility as shown in BIOS SOFTWARE.
Programming BBLKW
Disabled/Protect [1-2] (Default)
Enabled [2-3]
Boot Block Programming (Disable / Enable)
Enabled
1
2
3
BBLKW
Disabled / Protected
(Default)
1
2
3
BBLKW
R
III. INSTALLATION
(Jumpers)

16 ASUS TX97-X User’s Manual
III. INSTALLATION
(Jumpers)
III. INSTALLATION
3. OnboardAudio Selection (AUDIO) (with optional onboard Audio)
This jumper allows you to Disable the onboard audio chipset inorder to use your
own audio card. Otherwise, leave on default of Enabled.
Onboard Audio AUDIO
Enabled [2-3] (Default)
Disabled [1-2]
Onboard Audio (Disable / Enable)
Enable
(Default)
1
2
3
AUDIO
Disable
1
2
3
AUDIO
R
4. Onboard DigitalAudio Control (VOLCTL) (with optional onboardAudio)
This jumper allows you to adjust the audio volume digitally using case mounted
momentary buttons.
Audio Control VOLCTL
Volume Up [1-2] (momentary)
Volume Down [4-5] (momentary)
Onboard Digital Audio Control
1
2
3
VOLCTL
5
4
Ground
Volume Up
Ground
Ground
Volume Down
R

ASUS TX97-X User’s Manual 17
5. Real Time Clock (RTC) RAM (RTCLR)
The CMOS RAM is powered by the onboard button cell battery. To clear the
RTC data: (1) Turn off your computer, (2) Move this jumper to “Clear Data,”
(3) Move the jumper back to “Operation,” (4) Turn on your computer, (5) Hold
down <Delete> during bootup and enter BIOS setup to re-enter user preferences.
Battery Test Jumper (RTCLR)
You can test the battery’s current by removing this jumper and attaching a cur-
rent meter to pins 1&2. WARNING: You must unplug the power cord to
your power supply to ensure that there is no power to your motherboard.
The CMOS RAM containing BIOS setup information may be cleared by
this action. You should enter BIOS to “Load Setup Defaults” and re-enter
any user information after removing and reapplying this jumper.
RTC RAM RTCLR
Operation [1-2] (Default)
Clear Data [2-3] (momentarily)
RTC RAM (Operation / Clear Data)
Operation (Default)
RTCLR
Clear Data
RTCLR
Battery Test
R
III. INSTALLATION
(Jumpers)
III. INSTALLATION

18 ASUS TX97-X User’s Manual
III. INSTALLATION
(Jumpers)
III. INSTALLATION
6. CPU External (BUS) Frequency Selection (FS0, FS1, FS2)
These jumpers tell the clock generator what frequency to send to the CPU. These
allow the selection of the CPU’s External frequency (or BUS Clock). The BUS Clock
timestheBUSRatioequalstheCPU's Internalfrequency(the advertisedCPUspeed).
7. CPU to BUS Frequency Ratio (BF0, BF1)
These jumpers set the frequency ratio between the Internal frequency of the CPU
and the External frequency (called the BUS Clock) within the CPU. These must
be set together with the above jumpers CPU External (BUS) Frequency Selection.
CPU : BUS Frequency Ratio
CPU External Clock (BUS) Frequency Selection
50MHz
FS1
1
2
3
FS0 FS2
55MHz
FS1
FS0
FS2
1
2
360MHz
FS1
FS0
FS2
1
2
366MHz
FS1
FS0
FS2
1
2
3
BF1
BF0
1
2
3
BF1
BF0
1
2
3
BF1
BF0
1
2
3
BF1
1
2
3
BF0
R
2.5 x3.0 x2.0 x3.5 x 2.5 x3.0 x2.0 x1.5 x
2.0 x3.0 x2.0 x3.0 x
Intel P54C
Intel P55C
Cyrix M1
Set the jumpers by the Internal speed of the Intel, AMD, or Cyrix CPU as follows:
(BUS Freq.) (Freq. Ratio)
CPU Model Freq. Ratio BUS Freq. FS2 FS1 FS0 BF1 BF0
Intel Pentium 200MHz 3.0x 66MHz [2-3] [2-3] [1-2] [2-3] [1-2]
Intel Pentium 166MHz 2.5x 66MHz [2-3] [2-3] [1-2] [2-3] [2-3]
Intel Pentium 150MHz 2.5x 60MHz [2-3] [2-3] [2-3] [2-3] [2-3]
Intel Pentium 133MHz 2.0x 66MHz [2-3] [2-3] [1-2] [1-2] [2-3]
Intel Pentium 120MHz 2.0x 60MHz [2-3] [2-3] [2-3] [1-2] [2-3]
Intel Pentium 100MHz 1.5x 66MHz [2-3] [2-3] [1-2] [1-2] [1-2]
Intel Pentium 90MHz 1.5x 60MHz [2-3] [2-3] [2-3] [1-2] [1-2]
Intel Pentium 75MHz 1.5x 50MHz [2-3] [1-2] [2-3] [1-2] [1-2]
AMD-K5-PR133 100MHz 1.5x 66MHz [2-3] [2-3] [1-2] [1-2] [1-2]
AMD-K5-PR120 90MHz 1.5x 60MHz [2-3] [2-3] [2-3] [1-2] [1-2]
AMD-K5-PR100 100MHz 1.5x 66MHz [2-3] [2-3] [1-2] [1-2] [1-2]
AMD-K5-PR90 90MHz 1.5x 60MHz [2-3] [2-3] [2-3] [1-2] [1-2]
AMD-K5-PR75 75MHz 1.5x 50MHz [2-3] [1-2] [2-3] [1-2] [1-2]
*Cyrix 166+ 133MHz 2.0x 66MHz [2-3] [2-3] [1-2] [1-2] [2-3]
*NOTE: Only Cyrix Revision 2.7 or later is supported on this motherboard. See next page for revision
identification. Bootup screen will show 6x86-P166+ with the Cyrix 166+ installed on this
motherboard.

ASUS TX97-X User’s Manual 19
III. INSTALLATION
(System Memory)
III. INSTALLATION
8. Voltage Regulator Output Selection (VID0, 1, 2)
These jumpers set the voltage supplied to the CPU. Current Intel CPU's marked
"Pentium" has only a Single Power Plane and uses the standard 3.38 volts (STD)
or 3.5 volts (VRE). Currently Intel’s new Pentium P55C MMX 200MHz with
Dual Power Planes is supported at 2.8Volts. The voltage regulators will automati-
cally detect and switch between Single Power Plane and Dual Power Planes.
Intel P54C Pentium
(75-200MHz) Intel P55C Pentium
MMX (150-200MHz) AMD-K5
(PR75-133MHz) Cyrix 6x86 166+
Rev2.7 (133MHz)
Type Setting Voltage VID2 VID1 VID0
AMD K5 AMD 3 2.5V [1-2] [2-3] [1-2]
AMD K5 AMD 1 2.7V [1-2] [1-2] [1-2]
P55C P55C 2.8V [2-3] [2-3] [2-3]
AMD K5 AMD 2 2.9V [1-2] [2-3] [2-3]
(Reserved) (Reserved) 3.1V [1-2] [1-2] [2-3]
P54C/CS STD 3.4V [2-3] [1-2] [2-3]
P54C/CS VRE 3.5V [1-2] [1-2] [2-3]
Voltage Regulator Output Selection
2.5Volt
VID1
1
2
3
VID0 VID2
2.7Volt
VID1
VID0
VID2
1
2
32.8Volt
VID1
VID0
VID2
1
2
32.9Volt
VID1
VID0
VID2
1
2
3
3.1Volt
VID1
1
2
3
VID0 VID2
3.4Volt
VID1
VID0
VID2
1
2
33.5Volt
VID1
VID0
VID2
1
2
3
R
Compatible Cyrix CPU Identification
The only Cyrix CPU that is supported on this motherboard is
labeled Cyrix 6x86 P166+ but must be Revision 2.7 and later.
Look on the underside of the CPU for the serial number. The
number should read G8DC6620A or larger.

20 ASUS TX97-X User’s Manual
III. INSTALLATION
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