Pentium Super7 Motherboard

USERS MANUAL

USER'S NOTICE
No part of this manual, including the products and software described in it, may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any means, except documentation kept by the purchaser for backup purposes, without the express written permission of ASUSTeK COMPUTER INC. (ASUS). ASUS PROVIDES THIS MANUAL AS IS WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE), EVEN IF ASUS HAc BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS MANUAL OR PRODUCT. Product warranty or service will not be extended if: (1) the product is repaired, modified or altered, unless such repair, modification of alteration is authorized in writing by ASUS; 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 trademarks or copyrights of their respective companies, and are used only for identification or explanation and to the owners benefit, without intent to infringe.
ALi and Aladdin are trademarks of Acer Laboratories Inc. (ALi) Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated. AMD, K6, and combinations thereof are trademarks of Advanced Micro Devices, Inc. Cyrix, M II, and combinations thereof are trademarks of National Semiconductor Corporation. IBM is a registered trademark of IBM Corporation. Intel, LANDesk, and Pentium are registered trademarks of Intel 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 revisions 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, contact ASUS at http://www.asus.com.tw or through any of the means indicated on the following page. SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT. Copyright 1999 ASUSTeK COMPUTER INC. All Rights Reserved.
Product Name: Manual Revision: Release Date:
ASUS P5A-B 1.07 E381 April 1999

ASUS P5A-B Users Manual

ASUS CONTACT INFORMATION
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Marketing

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Technical Support

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CONTENTS

I. INTRODUCTION... How this Manual is Organized... Item Checklist.... II. FEATURES... ASUS P5A-B Motherboard... Introduction to ASUS Smart Series Motherboards. Parts of the ASUS P5A-B Motherboard.. III. INSTALLATION... ASUS P5A-B Motherboard Layout.. Installation Steps... 1. Jumpers... Jumper Settings... Compatible Cyrix CPU Identification.. 2. System Memory (DIMM).. DIMM Memory Installation Procedures:.. 3. Central Processing Unit (CPU)... 4. Expansion Cards... Expansion Card Installation Procedure:. Assigning IRQs for Expansion Cards.. Assigning DMA Channels for ISA Cards.. ISA Cards and Hardware Monitor.. Accelerated Graphics Port.. 5. External Connectors... Power Connection Procedures... IV. BIOS SOFTWARE.. Flash Memory Writer Utility... Main Menu... Managing and Updating Your Motherboards BIOS. 6. BIOS Setup... Load Defaults... Standard CMOS Setup... Details of Standard CMOS Setup... BIOS Features Setup... Details of BIOS Features Setup.. Chipset Features Setup... Details of Chipset Features Setup... Power Management Setup... Details of Power Management Setup.. PNP and PCI Setup... Details of PNP and PCI Setup... 52 52

I. INTRODUCTION

I. II. III. IV. V. VI. VII. Introduction Features Installation BIOS Software Support Software ASUS CIDB ASUS L101 Card APPENDIX Manual information and checklist Information and specifications concerning this product Instructions on setting up the motherboard Instructions on setting up the BIOS software Information on the included support software Installation of the ASUS CIDB Chassis Sensor (optional) Installation of the ASUS LAN card (optional) Glossary of Terms I. INTRODUCTION Sections/Checklist 7
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 (2) 9-pin male serial external connector set (1) 25-pin female parallel + 6-pin female PS/2 mouse external connector set (1) IDE ribbon cable for master and slave drives (1) Ribbon cable for (1) 5.25 and (2) 3.5 floppy disk drives (1) Bag of spare jumpers (1) CD disc with support drivers and utilities (1) Users Manual Audio Bracket (only available with ISA audio option) ASUS CIDB chassis sensor module (optional) PS/2 Mouse, Infrared, USB1, and USB2 external connector module (optional) ASUS PCI-L101 Wake-On-LAN 10/100 Ethernet Card (optional)

II. FEATURES

ASUS P5A-B Motherboard
ALi AGPset: ALi (Acer Laboratories Inc.) Aladdin V AGPset with support for a 100MHz Front Side Bus (FSB), Accelerated Graphics Port (AGP), and all current Socket-7 processors. Multi-Processor/Multi-Speed Support: AMD K6-III /400 & faster, AMD K62/266 & faster, AMD K6/166 & faster, AMD K5/90133, IBM/Cyrix 6x86MX/ M II (PR166 & faster), IDT WinChip 2/240 & faster, IBM/Cyrix 6x86-PR166+ (Rev 2.7 or later), Intel Pentium 90233MHz (P55C-MMX, P54C/P54CS). Level 2 Cache SRAM/Tag RAM: Supports 512KB/1MB pipelined-burst SRAM/L2 memory cache and integrated Tag RAM to make using the 100MHz bus speed possible. Enhanced ACPI and Anti-Boot Virus BIOS: Features a programmable BIOS, offering enhanced ACPI for Windows 98 compatibility, built-in hardware-based virus protection through Trend ChipAwayVirus, and autodetection of most devices for virtually automatic setup. 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 95MHz/100MHz bus speed requirement. AGP Slot: Supports AGP cards for high performance, component level interconnection targeted at 3D graphical display applications. ISA Audio (optional): Features C-Medias 3D positional sound chip, which provides such cutting edge features as wavetable music synthesizer, 3D surround audio, and SPDIF I/O interface in addition to the usual compatibility with games written for both Windows 95/98 and DOS. UltraDMA/33 BM IDE: Comes with an onboard PCI Bus Master IDE controller with two connectors that supports four IDE devices in two channels, supports UltraDMA/33, PIO Modes 3 and 4 and Bus Master IDE DMA Mode 2, and supports Enhanced IDE devices, such as Tape Backup and CD-ROM drives. Supports two drives of either 5.25-inch (360KB or 1.2MB) or 3.5-inch (720KB, 1.44MB, or 2.88MB) disk drives. Supports Japanese Floppy 3 mode (3.5-inch disk drive: 1.2MB) and LS-120 floppy disk drives (3.5-inch disk drive: 120 MB, 1.44MB, 720K). BIOS supports IDE CD-ROM or SCSI device boot-up. Wake-On-LAN: Supports Wake-OnLAN activity with special network cards, such as the ASUS PCI-L101 10/100 Fast Ethernet PCI card. PC Health Monitoring (optional): Provides a convenient utility to monitor your systems vital components/activities, such as fan rotations, voltages, and temperatures. 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. 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) USB, PS/2 Mouse, IrDA Connector: Supports an optional cable and bracket 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.

Connectors

1) KB 2) FLOPPY 3) PRINTER 4) COM1, COM2 5) FAN 6) CHASIS 7) PRIMARY/SECOND. IDE 8) IDELED 9) ATX 10) PS/2 11) USB/MIR 12) IR 13) MSG.LED (PANEL) 14) PWR SW. (PANEL) 15) RESET (PANEL) 16) PWR.LED (PANEL) 17) KEYLOCK (PANEL) 18) SPEAKER (PANEL) 19) WOLCON 20) SMB 21) AUDIOCON 22) SPD0/SPD1/TTL 23) AUX 24) CD1
p. 25 p. 25 p. 26 p. 26 p. 27 p. 27 p. 28 p. 28 p. 29 p. 29 p. 31 p. 31 p. 31 p. 31 p. 31 p. 31 p. 31 p. 31 p. 32 p. 32 p. 33 p. 33 p. 34 p. 34
Keyboard Connector (5-pin Female) Floppy Drive Connector (34-1 pins) Parallel (Printer) Port Connector (26-1 pins) Serial Port COM1 & COM2 (10-1 pins) Power Supply, Chassis, CPU Fan Power Leads (3 pins) Chassis Open Alarm Lead (4-1 pins) Primary/Secondary IDE Connector (40-1 pins) IDE LED Activity Light (2 pins) ATX Motherboard Power Connector (20 pins) AT Motherboard Power Connector (12 pins) USB, Infrared, PS/2 Mouse Module Connector (18-1 pins) IrDA-compliant Infrared Module Connector (5 pins) System Message LED (2 pins) ATX Power Switch/Soft Power Switch Lead (2 pins) Reset Switch Lead (2 pins) System Power LED Lead (3 pins) Keyboard Lock Switch Lead (2 pins) Speaker Output Connector (4 pins) Wake-On-LAN Activity Connector (3 pins) SMBus Connector (5-1 pins) Audio Jack Connector (26 pins) Digital Audio Interface (6 pins) Stereo Audio In Connector (4 pins) Stereo Audio In Connector (4 pins)
The onboard hardware monitor uses the address 290H-297H so legacy ISA cards must not use this address or else conflicts will occur.
III. INST ALLATION Map of Board

Installation Steps

Before using your computer, you must complete the following steps: 1. 2. 3. 4. 5. 6. Set Jumpers on the Motherboard Install System Memory Modules Install the Central Processing Unit (CPU) Install Expansion Cards Connect Ribbon Cables, Cabinet Wires, and Power Supply Setup the BIOS Software

1. 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. INST ALLATION Jumpers 14

Jumper Settings

1. Real Time Clock (RTC) RAM (CLRTC) The CMOS RAM is powered by the onboard button cell battery. To clear the RTC data: (1) Turn off your computer, (2) Short solder points using a small metalic object, (3) Turn on your computer, (4) Hold down <Delete> during bootup and enter BIOS setup to re-enter user preferences.

P5A-B Clear RTC RAM

2. Voltage Input/Output Selection (VIO) This jumper allows you to select the voltage supplied to the DRAM, chipset, and AGP.

VIO0 VIO1

3 3.5Volts 3.6Volts 3.8Volts 4.0Volts

(DEFAULT)

P5A-B Voltage Input/Output Selection
WARNING! Using a higher voltage may help when overclocking but may result in the shortening of your computer components life. Use default setting.
III. INST ALLATION Jumpers
Short solder points to Clear CMOS
3. CPU External (BUS) Frequency Selection (FS0, FS1, FS2, FS3) These jumpers tell the clock generator what frequency to send to the CPU. These allow the selection of the CPUs External frequency (or BUS Clock). The BUS Clock times the BUS Ratio equals the CPU's Internal frequency (the advertised CPU speed). 4. CPU to BUS Frequency Multiple (BF0, BF1, BF2) 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 in conjunction with the jumpers for CPU External (BUS) Frequency Selection.
FS0 FS1 FS2 FS3 FS0 FS1 FS2 FS3

3 CPU AGP PCI

60MHz 60MHz 30MHz

66.8MHz 66.8MHz 33.4MHz

FS0 FS1 FS2 FS3
75MHz 75MHz 37.5MHz 100MHz 66.6MHz 33.3MHz 120MHz 80MHz 40MHz
3 CPU 83.3MHz AGP 66.6MHz PCI 33.3MHz 3 CPU 110MHz AGP 73MHz PCI 36.6MHz

95MHz 63.3MHz 31.6MHz

115MHz 77.6MHz 38.3MHz
CPU External Clock (BUS) Frequency Selection
BF0 BF1 BF2 BF0 BF1 BF2 BF0 BF1 BF2
2.5x(5/2) 2.5x(5/2) 2.5x(5/2) 2.5x(5/2) 1.0x(1/1) 2.5x(5/2) 3 CPU A 3.5x(7/2) 6.0x(6/1) CPU B 3.5x(7/2) 2.0x(2/1) CPU C 1.5x(3/2) 2.0x(2/1) CPU D 3.5x(7/2) 2.0x(2/1) CPU E 3.0x(3/1) 2.0x(2/1) CPU F 3.5x(7/2) 3.33x(10/3)
Match the Mult. (Multiple) column of the table on the opposite page to these CPU types: CPU A: CPU B: CPU C: CPU D: AMD-K6-III, AMD-K6-2/400&faster AMD-K6-2/380&slower, AMD-K6 Intel Pentium P54C, AMD-K5 Intel Pentium P55C, IBM/Cyrix 6x86MX, IBM/Cyrix M II CPU E: IBM/Cyrix 6x86, IBM/Cyrix 6x86L CPU F: IDT WinChip 2
3.0x(3/1) 3.0x(3/1) 3.0x(3/1) 3.0x(3/1) 3.0x(3/1)

BF0 BF1 BF2

5.0x(5/1) 5.0x(5/1) 2.33x(7/3)
3 CPU A 4.0x(4/1) CPU B 4.0x(4/1) CPU C CPU D CPU E CPU F 4.0x(4/1) 4.5x(9/2) 4.5x(9/2) 4.5x(9/2) 5.5x(11/2) 5.5x(11/2) 2.66x(8/3)

[1-2] [1-2] [----] [1-2] [2-3] [----] [2-3] [2-3] [----] [1-2] [2-3] [----] [1-2] [2-3] [----] [1-2] [1-2] [----] [1-2] [2-3] [----] [2-3] [2-3] [----] [2-3] [2-3] [----] [2-3] [1-2] [----] [2-3] [1-2] [----] [2-3] [1-2] [2-3]
IBM/Cyrix 6x86MX-PR233 200MHz IBM/Cyrix 6x86MX-PR200 166MHz IBM/Cyrix 6x86MX-PR166 150MHz *IBM/Cyrix 6x86-PR166+ 133MHz *IBM/Cyrix 6x86L-PR166+ 133MHz IDT WinChip 2 240MHz
*NOTE:The only IBM or Cyrix 6x86(L) (or M I) that is supported on this motherboard is revision 2.7 or later (see next page).
Compatible Cyrix CPU Identification
The only Cyrix 6x86-PR166+ CPU that is supported on this motherboard must be Revision 2.7 or later. Look on the underside of the CPU for the serial number. The number should read G8DC6620A or later. 5. Voltage Regulator Output Selection (VID0, 1, 2, 3) These jumpers set the voltage supplied to the CPU. Switching regulators allow some jumper settings to be the same for two voltages of different power planes. WARNING! Because CPU designs change rapidly, the table below is only intended as a simple guideline and thus may not be true for your CPU. Always refer to the CPU documentation for your CPUs voltage and then set the appropriate VID jumpers according to the illustration below.
Manufacturer CPU Type AMD (.25micron) K6-III/400,450 K6-2/450,475 Single Plane ---Dual Plane 2.4V(Dual) 2.2V(Dual) VID0 VID1 VID2 VID3 [1-2] [1-2] [2-3] [1-2] [1-2] [2-3] [1-2] [1-2]

VID0 VID1 VID2 VID3

3 2.0Volts

2.1Volts

2.2Volts

2.3Volts

3 2.5Volts 3 3.0Volts 3.1Volts 3 3.5Volts 3.2Volts 3.3Volts 3.4Volts 2.6Volts 2.7Volts 2.8Volts 2.9Volts
P5A-B CPU Vcore Voltage Selection
AMD (.25micron) K6-2/266,300,333, ---350,366,380,400 K6-233,266,300 AMD K5 3.5V(VRE) IBM/Cyrix 6x86 3.5V(VRE) Intel P54C/P54CS 3.5V(VRE) AMD K5 3.4V(STD) Intel P54C/P54CS 3.4V(STD) AMD (.35micron) K6-PR233 ---AMD (.35micron) K6-166,200 ---IBM/Cyrix 6x86MX ---Intel P55C-MMX ----
--------------3.2V(Dual) 2.9V(Dual) 2.9V(Dual) 2.8V(Dual)
[2-3] [2-3] [2-3] [1-2] [1-2] [1-2] [2-3] [2-3] [1-2]
[2-3] [2-3] [2-3] [2-3] [2-3] [1-2] [1-2] [1-2] [1-2]
[2-3] [2-3] [2-3] [2-3] [2-3] [2-3] [1-2] [1-2] [1-2]
[2-3] [2-3] [2-3] [2-3] [2-3] [2-3] [2-3] [2-3] [2-3]

2.4Volts

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) of either 8, 16, 32, 64, 128MB, or 256MB to form a memory size between 8MB and 768MB. 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. IMPORTANT (see General DIMM Notes below) To make using bus speeds 95MHz possible, SDRAMs used must be compatible with the current Intel PC100 SDRAM specification. Install memory in any combination as follows:

DIMM Location Socket 1 (Rows 0&1) Socket 2 (Rows 2&3) Socket 3 (Rows 4&5) 168-pin DIMM SDRAM 8, 16, 32, 64, 128, 256MB SDRAM 8, 16, 32, 64, 128, 256MB SDRAM 8, 16, 32, 64, 128, 256MB x1 x1 x1 Total Memory
Total System Memory (Max 768MB) =
Notes DIMMs that have more than 18 chips are not supported on this motherboard. To make using bus speeds 95MHz possible, use only PC100-compliant DIMMs. Most
systems will not even boot if non-compliant modules are used because of the strict timing issues involved with speeds 95MHz. Two possible memory chips are supported: SDRAM with and without ECC. ECC is not supported when using bus speeds 83MHz. SDRAM chips are generally thinner and have higher pin density than EDO 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 are available in 16, 32, 64, 128MB; double-sided in 32, 64, 128, 256MB.
III. INST ALLATION System Memory
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.

88 Pins

60 Pins
III. INST ALLATION System Memory 20

20 Pins

P5A-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)
The motherboard provides a 321-pin ZIF Socket 7 that is backwards compatible with ZIF Socket 5 processors. The CPU that came with the motherboard should have a fan attached to it to prevent overheating. If this is not the case then purchase a fan before you turn on your system. WARNING! Without a fan circulating air on the CPU, the CPU can overheat and cause damage to both the CPU and the motherboard. To install a CPU, first turn off your system and remove its cover. Locate the ZIF socket and open it by first pulling the lever sideways away from the socket then upwards to a 90-degree right angle. Insert the CPU with the correct orientation as shown. Use the notched corner of the CPU with the white dot as your guide. The white dot should point towards the end the of the lever. Notice that there is a blank area where one hole is missing from that corner of the square array of pin holes and a 1 printed on the motherboard next to that corner. Because the CPU has a corner pin for three of the four corners, the CPU will only fit in the one orientation as shown. The picture is for reference only; you should have a CPU fan that will cover the face of the CPU. With the added weight of the CPU fan, no force is required to insert the CPU. Once completely inserted, hold down on the fan and close the sockets lever. IMPORTANT: You must set jumpers for CPU to BUS Frequency Ratio and jumpers for BUS Frequency Selection depending on the CPU that you install.

Assigning DMA Channels for ISA Cards
Some ISA cards, both legacy and PnP, may also need to use a DMA (Direct Memory Access) channel. DMA assignments for this motherboard are handled the same way as the IRQ assignment process described earlier. You can select a DMA channel in the PCI and PnP configuration section of the BIOS Setup utility. IMPORTANT: To avoid conflicts, reserve the necessary IRQs and DMAs for legacy ISA cards (under PNP AND PCI SETUP of the BIOS SOFTWARE, choose Yes in IRQ xx Used By ISA and DMA x Used By ISA for those IRQs and DMAs you want to reserve).
ISA Cards and Hardware Monitor
The onboard hardware monitor uses the address 290H-297H, so legacy ISA cards must not use this address or else conflicts will occur.
This motherboard provides an accelerated graphics port (AGP) slot to support a new generation of graphics cards with ultra-high memory bandwidth, such as an ASUS 3D Hardware Accelerator.
NOTE: You must first install the AGP Mini Port Driver (see support CD) to avail of the motherboards AGP features.
P5A-B Accelerated Graphics Port (AGP)

5. External Connectors

WARNING! Some pins are used for connectors or power sources. These are clearly separated from jumpers in Map of the ASUS Motherboard. Placing jumper caps over these will cause damage to your motherboard. IMPORTANT: Ribbon cables should always be connected with the red stripe on the Pin 1 side of the connector. The four corners of the connectors are labeled on the motherboard. Pin 1 is the side closest to the power connector on hard drives and some floppy drives. IDE ribbon cable must be less than 18in. (46cm), with the second drive connector no more than 6in. (15cm) from the first connector. 1. Keyboard Connector (KB, 5-pin female) This connector supports either a standard IBM-compatible, 101/102-key, or 104key keyboard (Windows 95-compatible). III. INST ALLATION Connectors 25
Keyboard Connector (5-pin female)
This motherboard accepts an AT Keyboard Connector Plug as shown here.

P5A-B Keyboard Connector

2. Floppy drive connector (FLOPPY, 34-1 pin block ) This connector supports the provided floppy drive ribbon cable. After connecting the single end to the board, connect the two plugs on the other end to the floppy drives. (Pin 5 is removed to prevent inserting in the wrong orientation when using ribbon cables with pin 5 plugged).
Pin 1 Orient the red stripe on your cable to Pin 1
P5A-B Floppy Disk Drive Connector
3. Parallel Connector (PARALLEL, 26-1 pin block) This connector supports the included parallel port ribbon cable with mounting bracket. Connect the ribbon cable to this connection and mount the bracket to the case on an open slot. A PS/2 mouse connector is included for the USB/ Mouse/IR onboard connector if the optional USB/MIR connector is not used. You can make available the parallel port and choose the IRQ through the Onboard Parallel Port in Chipset Features of the BIOS SOFTWARE. (Pin 26 is removed to prevent inserting in the wrong orientation when using ribbon cables with pin 26 plugged). NOTE: Serial printers must be connected to the serial port.

Secondary IDE Connector Pin 1 Primary IDE Connector
NOTE: Orient the red stripe on your cable to Pin 1
III. INST ALLATION Connectors 28

P5A-B IDE Connectors

TIP: You may configure two hard disks to be both Masters using one ribbon cable on the primary IDE connector and another ribbon cable on the secondary IDE connector. You may install one operating system on an IDE drive and another on a SCSI drive and select the boot disk through BIOS Features Setup. 8. IDE activity LED (IDELED, 2 pins) This connector supplies power to the cabinets IDE activity LED. Read and write activity by devices connected to the Primary or Secondary IDE connectors will cause the LED to light up.
TIP: If the case-mounted LED does not light, try reversing the 2-pin plug. IDELED +

P5A-B IDE Activity LED

9. ATX Power Supply Connector (ATX, 20-pin block) This connector connects to an ATX power supply. The plug from the power supply will only insert in one orientation because of the different hole sizes. Find the proper orientation and push down firmly making sure that the pins are aligned. IMPORTANT: Make sure that your ATX power supply can supply at least 10mAmp on the 5-volt standby lead (+5VSB). You may experience difficulty in powering on your system if your power supply cannot support the load. For Wake on LAN support, your ATX power supply must supply at least 720mA.
P5A-B ATX Power Connector
10. AT Power Supply Connector (PS/2, 12-pin block) This connector connects to a standard 5 Volt power supply. To connect the leads from the power supply, ensure first that the power supply is not plugged. Most power supplies provide two plugs (P8 and P9), each containing six wires, two of which are black. Orient the connectors so that the black wires are together.

PG +12V +5V -12V GND

ORG RED YLW BLU BLK BLK BLK BLK WHT RED RED RED
Power Connector on Motherboard
Power Plugs from Power Supply

P5A-B AT Power Connector

At a slight angle, align the plastic guide pins on the lead to their receptacles on the connector. Once aligned, press the lead onto the connector until the lead locks into place.
+12.0 Volts +5V Standby Power Good Ground +5.0 Volts Ground +5.0 Volts Ground +3.3 Volts +3.3 Volts
+5.0 Volts +5.0 Volts -5.0 Volts Ground Ground Ground Power Supply On Ground -12.0 Volts +3.3 Volts
11. USB, Infrared, PS/2 Mouse Module Connector (USB/MIR, 18-1 pin block) If you want to use PS/2 mouse, USB, or infrared (IrDA) devices, you need to purchase an external connector set. The external connector set connects to the 18-pin block and mounts to an open slot on your computers chassis. The system will direct IRQ12 to the PS/2 mouse if one is detected. If not detected, expansion cards can use IRQ12. See PS/2 Mouse Control in BIOS Features Setup and USB Function in PnP and PCI Setup of the BIOS SOFTWARE. See Second IrDA. connector for details on the infrared connector.

Upon First Use of the Computer System 1. Create a bootable system floppy disk by typing [FORMAT A:/S] from the DOS prompt without creating AUTOEXEC.BAT and CONFIG.SYS files. 2. Copy AFLASH.EXE to the just created boot disk. 3. Run AFLASH.EXE from this new disk and select option 1. Save Current BIOS to File. See 1. Save Current BIOS To File on the previous page for more details and the rest of the steps. Updating BIOS Procedures (only when necessary) 1. Download an updated ASUS BIOS file from the Internet (WWW or FTP) or a BBS (Bulletin Board Service) (see ASUS CONTACT INFORMATION on page 3 for details) and save to the disk you created earlier. 2. Boot from the disk you created earlier. 3. At the A:\ prompt, type AFLASH and then press <Enter>. 4. At the Main Menu, type 2 and then press <Enter>. See 2. Update BIOS Including Boot Block and ESCD on the previous page for more details and the rest of the steps. WARNING! If you encounter problems while updating the new BIOS, DO NOT turn off your system since this might prevent your system from booting up. Just repeat the process, and if the problem still persists, update the original BIOS file you saved to disk above. If the Flash Memory Writer utility was not able to successfully update a complete BIOS file, your system may not be able to boot up. If this happens, your system will need service.
IV. BIOS Flash Memory Writer 38

6. BIOS Setup

The motherboard supports two programmable Flash ROM chips: 5 volt and 12 volt. Either of these memory chips can be updated when BIOS upgrades are released. Use the Flash Memory Writer utility to download the new BIOS file into the ROM chip as described in detail in this section. All computer motherboards provide a Setup utility program for specifying the system configuration and settings. If your motherboard came in a computer system, the proper configuration entries may have already been made. If so, invoke the Setup utility, as described later, and take note of the configuration settings for future reference; in particular, the hard disk specifications. If you are installing the motherboard, reconfiguring your system or you receive a Run Setup message, you will need to enter new setup information. This section describes how to configure your system using this utility. The BIOS ROM of the system stores the Setup utility. When you turn on the computer, the system provides you with the opportunity to run this program. This appears during the Power-On Self Test (POST). Press <Delete> to call up the Setup utility. If you are a little bit late pressing the mentioned key(s), POST will continue with its test routines, thus preventing you from calling up Setup. If you still need to call Setup, reset the system by pressing <Ctrl> + <Alt> + <Delete>, or by pressing the Reset button on the system case. You can also restart by turning the system off and then back on again. But do so only if the first two methods fail. When you invoke Setup, the CMOS SETUP UTILITY main program screen will appear with the following options:

IV. BIOS BIOS Setup

Load Defaults
Load BIOS Defaults loads the minimum settings for troubleshooting. Load Setup Defaults, on the other hand, is for loading optimized defaults for regular use. Choosing defaults at this level will modify all applicable settings. A section at the bottom of the preceding screen displays the control keys for this screen. Take note of these keys and their respective uses.

Standard CMOS Setup

Standard CMOS Setup allows you to record some basic system hardware configuration and set the system clock and error handling. If the motherboard is already installed in a working system, you will not need to select this option anymore. However, if the configuration stored in the CMOS memory on the board gets lost or damaged, or if you change your system hardware configuration, you will need to respecify the configuration values. The configuration values usually get lost or corrupted when the power of the onboard CMOS battery weakens.
IV. BIOS Standard CMOS The preceding screen provides you with a list of options. At the bottom of this screen are the control keys. Take note of these keys and their respective uses. User-configurable fields appear in a different color. If you need information on the selected field, press <F1>. The help menu will then appear to provide you with the information you need. The memory display at the lower right of the screen is readonly and automatically adjusts accordingly.
Details of Standard CMOS Setup
Date To set the date, highlight the Date field and then press either <Page Up>/<Page Down> or <+>/<> to set the current date. Follow the month, day and year format. Valid values for month, day and year are: Month: (1 to 12), Day: (1 to 31), Year: (up to 2079)
Time To set the time, highlight the Time field and then press either <Page Up>/<Page Down> or <+>/<> to set the current time. Follow the hour, minute and second format. Valid values for hour, minute and second are: (Hour: (00 to 23), Minute: (00 to 59), Second: (00 to 59). If you do not want to modify the current time, press <Enter> three times to go to HARD DISKS. NOTE: You can bypass the date and time prompts by creating an AUTOEXEC.BAT file. For information on how to create this file, refer to the MS-DOS manual. Hard Disk Drives This field records the specifications for all non-SCSI hard disk drives installed in your system. The onboard PCI IDE connectors provide Primary and Secondary channels for connecting up to four IDE hard disks or other IDE devices. Each channel can support up to two hard disks; the first of which is the master and the second is the slave. Specifications for SCSI hard disks need not to be entered here since they operate using device drivers and are not supported by any BIOS. If you install a SCSI controller card, refer to its documentation on how to install the required SCSI drivers. For IDE hard disk drive setup, you can: Use the Auto setting for detection during bootup. Use the IDE HDD AUTO DETECTION in the main menu to automatically enter the drive specifications. Enter the specifications yourself manually by using the User option. The entries for specifying the hard disk type include CYLS (number of cylinders), HEAD (number of read/write heads), PRECOMP (write precompensation), LANDZ (landing zone), SECTOR (number of sectors) and MODE. The SIZE field automatically adjusts according to the configuration you specify. The documentation that comes with your hard disk should provide you with the information regarding the drive specifications. The MODE entry is for IDE hard disks only, and can be ignored for MFM and ESDI drives. This entry provides three options: Normal, Large, LBA, or Auto (see below). Set MODE to the Normal for IDE hard disk drives smaller than 528MB; set it to LBA for drives over 528MB that support Logical Block Addressing (LBA) to allow larger IDE hard disks; set it to Large for drives over 528MB that do not support LBA. Large type of drive can only be used with MS-DOS and is very uncommon. Most IDE drives over 528MB support the LBA mode.

IV. BIOS Chipset Features IV. BIOS Chipset Features 48

Power Management Setup

Power Management Setup allows you to reduce power consumption. This feature turns off the video display and shuts down the hard disk after a period of inactivity.
NOTE: SETUP Defaults are enclosed in parentheses next to each function heading.
Details of Power Management Setup
Power Management (User Define) This field acts as the master control for the power management modes. User Define allows you to set power saving options according to your preference; Disable disables the power saving features; Min Saving puts the system into power saving mode after 40 min of system inactivity; Max Saving puts the system into power saving mode after 30 sec of system inactivity. 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 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 (Susp,Stby -> Off ) This field determines when to activate the video off feature for monitor power management. The settings are All Modes -> Off; Always On; Suspend -> Off; and Susp,Stby -> Off.
IV. BIOS Power Management
Video Off Method (DPMS OFF) This field defines the video off features. These 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 (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 Doze, Standby and Suspend system inactivation modes. 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) This shuts down any IDE hard disk drives in the system after a period of inactivity. This time period is user-configurable from 1 Min to 15 Min or Disable. This feature does not affect SCSI hard disks. Doze Mode, Standby Mode, Suspend Mode (Disable) These fields set the period of time after which each of these modes activate: 1 Min, 2 Min, 3 Min, 4 Min, 8 Min, 20 Min, 30 Min, 40 Min, or 1 Hour. The default setting is 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. xRegardless of the setting, holding the ATX switch for more than 4 seconds will power off the system. PWR Up On Modem Act (Enabled) This allows either settings of Enabled or Disabled for powering up the computer (turns the ATX power supply on) when the modem receives a call while the computer is off. NOTE: The computer cannot receive or transmit data until the computer and applications are fully running, thus connection cannot be made on the first try. Turning an external modem off and then back on while the computer is off causes an initialization string that will also cause the system to power on.

IV. BIOS Hard Disk Detect 56
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 and Exit

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V. SUPPORT SOFTWARE

ASUS Smart Motherboard Support CD
(Included only with motherboards with onboard hardware monitoring)
NOTE: The support CD version and contents are subject to change at any time without notice. To begin using your support CD disc, just insert it into your CD-ROM drive and the support CD installation menu will appear. If the menu does not appear, double click or run D:\SETUP.EXE (assuming that your CD-ROM drive is drive D:). ASUS PC Probe Setup: Installs a simple utility to monitor your computers fan, temperature, and voltages. (NOTE: This utility will not run with LDCM installed.) A users manual in Adobe Acrobat PDF format is available under the Probe folder created on your system during setup. You may refer also to the section on the ASUS PC Probe of this motherboard manual. Adobe Acrobat Reader: Installs the Adobe Acrobat Reader software necessary to view the users manuals in Adobe Acrobat PDF format. BusMaster: Installs the ALi BusMaster IDE driver for improved performance. Install Audio Driver: Displays instructions on installing the audio drivers for Windows 95, DOS and Windows 3.1. Install Audio Utilities: Installs the CM18330 Audio Rack utilities, namely, Audio Rack, CD Player, MIDI Player, Mixer, MPU-401 MIDI Device Setting, Surround Sound Demo, and Wave Player. Refer to the audio section of this motherboard manual for more information. Uninstall Audio Driver: Uninstalls the audio adapter device drivers that has been installed on your system. Patch for ALi chipset: Installs the M7101 Patch for Windows 95. Install PCCillin: Installs the PC-cillin virus protection software. View the online help if you have any questions. LDCM Introduction (MPEG VCD): Allows you to view a video on the LDCM features. Browse this CD: Allows you to view the contents of the CD. Readme: Displays the filelist for the included support software. Exit: Exit the selection menu.

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.
V. SOFTW ARE Using DMI Utility

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. SOFTW ARE 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. 62 ASUS P5A-B Users Manual

VI. ASUS CIDB

The ASUS CIDB Chassis Sensor
The optional ASUS CIDB is a module for providing audio alarm and logging when there is an intrusion into the chassis of a computer system. The module detects a chassis intrusion by either light striking its photo sensor or by contact when its switch connectors are shorted by chassis-mounted momentary toggle switches. An intrusion memory function allows detection by BIOS and LDCM on the next bootup.
Photo sensor to detect intrusion by light
Photo sensor sensitivity adjustment Battery for the memory Buzzer to sound the alarm

Intrusion memory

Connector to dock with the motherboards chassis connector Two switch connectors to detect intrusion by chassis mounted micro switches

Using the ASUS CIDB

1. You must have an ASUS motherboard with a chassis connector. 2. Connect the CIDB directly to the chassis connector or use the provided extension cable and mount the CIDB to the chassis using a double-sided foam adhesive tape. CAUTION! The CIDB component pins and metallic points must not come in contact with another metallic surface or else shorting will occur! 3. Check the hardware settings: JP1 jumper should be enabled to use the photo sensor MS1 and MS2 connectors should be connected to momentary toggle switches mounted on the chassis to use the contact method for triggering alarms. SW jumper should be enabled to allow the hardware monitoring components to receive signals from the CIDB. 4. To stop the alarm from sounding, use the LDCM software or place a jumper on (or short manually) the CLR jumper momentarily. 5. If you have an updated BIOS with intrusion support. Booting the computer after an intrusion will require a password which is configured through BIOS.

II. FEA TURES Features 8

Introduction to ASUS Smart Series Motherboards
Performance SDRAM Optimized Performance: ASUS Smart Series motherboards support the new generation memorySynchronous Dynamic Random Access Memory (SDRAM)which increases the data transfer rate from 264MB/sec maximum using EDO memory to 528MB/sec max using SDRAM. Double the IDE Transfer Speed: ASUS Smart Series motherboards with ALis Aladdin V chipset improves IDE transfer rate using UltraDMA/33 Bus Master IDE, which can handle data transfer up to 33MB/sec. The best of all is that this new technology is compatible with existing ATA-2 IDE specifications so there is no need to upgrade current hard drives or cables. Concurrent PCI: Concurrent PCI allows multiple PCI transfers from PCI master buses to memory to CPU. ACPI Ready: ACPI (Advanced Configuration and Power Interface) is also implemented on all ASUS Smart Series motherboards. ACPI provides more Energy Saving Features for the future operating systems (OS) supporting OS Direct Power Management (OSPM) functionality. With these features implemented in the OS, PCs can be ready around the clock, yet satisfy all the energy saving standards. To fully utilize the benefits of ACPI, an OS that supports ACPI, such as Windows 98, must be used. PC98 Compliant: Both the BIOS and hardware levels of the ASUS Smart Series motherboards meet PC98 compliancy. The new PC98 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/Windows 98 and Windows NT. Intelligence (with optional Hardware Monitor only) 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 and Alert: 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.
II. FEA TURES Smart Series
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: Todays operating systems, such as Windows 95, Windows NT, and OS/2, require much more memory and hard drive space to present enormous user interfaces and run large applications. The system resource monitor will warn the user before the system resources are used up to prevent possible application crashes. Suggestions will give the user information on managing their limited resources more efficiently. 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 overheat. The CPU utilization will restore normal operations when temperature 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 an important feature in implementing silent PC systems. Dual Function Power Button (requires ATX power supply): The system can be in one of two states, one is Sleep mode and the other is 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 (requires ATX power supply): This feature 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 (requires ACPI-supported OS): 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.

1. 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. INST ALLATION Jumpers 14

Jumper Settings

1. VGA Interrupt Selection (INT_EN) / 2. VGA Setting (VGAEN) INT_EN allows you to set the VGA interrupt method. The default disables the chipsets internal interrupt routing. Some TV tuners or MPEG cards may require the interrupt be assigned by the onboard chipset, in which case INT_EN must be enabled. VGAEN allows you to enable or disable the onboard VGA. Disable the onboard VGA if you are using a VGA card on the expansion slot.
VGAEN 3 Enable (Default) INT_EN 3 Enable (Default) VGAEN 3 Disable

P5A-VM VGA Settings

INT_EN 3 Disable
3. Keyboard Power (Wake) Up (KBPWR) 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.

Disable Enable

(DEFAULT)
P5A-VM Keyboard Power (Wake) Up
4. Voltage Input/Output Selection (VIO0, VIO1) / 5. Overclock Frequency Setting (OVER_FQ) VIO0/VIO1 allow you to select the voltage supplied to the DRAM, chipset, AGP, and the CPUs I/O buffer. When enabled, OVER_FQ allows you to increase the voltage supplied by 0.2V. This jumper is disabled by default.

3 VIO1

3.5Volts 3 VIO0 3.8Volts

3.6Volts 3

4.0Volts

Disable

Enable
P5A-VM Voltage Input/Output Selection / Overclock Frequency Settings
WARNING! Overclocking may damage your CPU and cause your system to be unstable. Use only the specified frequency of your CPU.
III. INST ALLATION Jumpers
NOTE: This feature requires an ATX power supply that can supply at least 300mA on the +5VSB lead and the new ACPI BIOS support. Your computer will not function if you set this to Enable and if you do not have the right ATX power supply.

III. INST ALLATION System Memory 20
Total System Memory (Max 768MB) =
NOTES At the time this Users Manual was written, 256MB DIMMs are available either as registered memory or 128Mbit DIMMs. DIMMs that have more than 18 chips are not supported on this motherboard. For the system CPU bus to operate 95MHz, use only PC100-compliant DIMMs. When this motherboard operates at 95MHz, most system will not even boot if noncompliant modules are used because of the strict timing issues involved under these speeds. If your DIMMs are not PC100-compliant, set the CPU bus frequency to 66MHz for system stability. ASUS motherboards support SPD (Serial Presence Detect) DIMMs. This is the memory of choice for best performance vs. stability. SDRAM chips are generally thinner with higher pin density than EDO (Extended Data Output) chips. BIOS shows SDRAM memory on bootup screen. Single-sided DIMMs come in 16, 32, 64,128MB; double-sided come in 32, 64, 128, 256MB.
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.
P5A-VM 168-Pin DIMM 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.
III. INST ALLATION System Memory

20 Pins 60 Pins

88 Pins
3. Central Processing Unit (CPU)
The motherboard provides a 321-pin ZIF Socket 7 that is backwards compatible with ZIF Socket 5 processors. The CPU that came with the motherboard should have a fan attached to it to prevent overheating. If this is not the case then purchase a fan before you turn on your system. WARNING! Without a fan circulating air on the CPU, the CPU can overheat and cause damage to both the CPU and the motherboard. To install a CPU, first turn off your system and remove its cover. Locate the ZIF socket and open it by first pulling the lever sideways away from the socket then upwards to a 90-degree right angle. Insert the CPU with the correct orientation as shown. Use the notched corner of the CPU with the white dot as your guide. The white dot should point toward the end of the lever. Notice that there is a blank area where one hole is missing from that corner of the square array of pin holes and a 1 printed on the motherboard next to that corner. Because the CPU has a corner pin for three of the four corners, the CPU will only fit in the one orientation as shown. The picture is for reference only; you should have a CPU fan that will cover the face of the CPU. With the added weight of the CPU fan, no force is required to insert the CPU. Once completely inserted, hold down on the fan and close the sockets lever. IMPORTANT: You must set jumpers for CPU to BUS Frequency Ratio and jumpers for BUS Frequency Selection depending on the CPU that you install. CAUTION! Be careful not to scrape the motherboard when mounting a clampstyle processor fan or else damage may occur to the motherboard.

III. INST ALLATION Connectors 26
Serial Port (9-pin Male) COM 1
P5A-VM Serial COM 2 Connector

To Serial Connector

5. Monitor (VGA) Output Connector (15-pin Female) This connector is for output to a VGA-compatible device.
VGA Monitor (15-pin Female)
6. Floppy drive connector (FLOPPY, 34-1 pin block ) This connector supports the provided floppy drive ribbon cable. After connecting the single end to the board, connect the two plugs on the other end to the floppy drives. (Pin 5 is removed to prevent inserting in the wrong orientation when using ribbon cables with pin 5 plugged). III. INST ALLATION Connectors 27
NOTE: Orient the red markings on the floppy ribbon cable to PIN 1
P5A-VM Floppy Disk Drive Connector
7. Audio Port Connectors (Three 1/8 Female) (with optional onboard audio) Line Out can be connected to headphones or preferably powered speakers. Line In allows tape players or other audio sources to be recorded by your computer or played through the Line Out. Mic allows microphones to be connected for inputing voice.
Line Out Line In Mic 1/8" Stereo Audio Connectors
8. Joystick/Midi Connector (15-pin Female) (with optional onboard audio) You may connect game joysticks or game pads to this connector for playing games. Connect Midi devices for playing or editing audio.
Joystick/Midi (15-pin Female)
9. Universal Serial BUS Ports 1 & 2 (Two 4-pin Female Sockets) Two USB ports are available for connecting USB devices.
III. INST ALLATION Connectors 28
Universal Serial Bus (USB) 2
10. Primary / Secondary IDE connectors (Two 40-1 pin block) These connectors support the provided IDE hard disk ribbon cable. After connecting the single end to the board, connect the two plugs at the other end to your hard disk(s). If you install two hard disks on the same channel, you must set the second drive to Slave mode. Refer to the documentation of your hard disk for the jumper settings. BIOS now supports SCSI device or IDE CD-ROM bootup (see HDD Sequence SCSI/IDE First & Boot Sequence in BIOS Features Setup of the BIOS SOFTWARE) (Pin 20 is removed to prevent inserting in the wrong orientation when using ribbon cables with pin 20 plugged).

Secondary IDE Connector

P5A-VM IDE Connectors
NOTE: Orient the red markings on the IDE ribbon cable to PIN 1

Primary IDE Connector

TIP: You may configure two hard disks to be both Master drives using one ribbon cable on the primary IDE connector and another ribbon cable on the secondary IDE connector. You may install one operating system on an IDE drive and another on a SCSI drive and select the boot disk through the BIOS features Setup. 11. Chassis Intrusion Alarm Lead (4-1 pin CHASIS) This requires an external detection mechanism such as a chassis intrusion monitor/sensor or microswitch. The sensor is triggered when a high level signal is sent to the CHASIS lead. This occurs when the side panel is opened or drive bay doors are opened. NOTE: When the chassis is opened, connect/short the Chassis Signal pin to the +5VSB pin. When the chassis is closed, connect/short the Chassis Signal pin to the Ground pin.

Flash Memory Writer Utility
IV. BIOS Flash Memory Writer 36
IMPORTANT! If unknown is displayed after Flash Memory:, the memory chip is either not programmable or is not supported by the ACPI BIOS and therefore, cannot be programmed by the Flash Memory Writer utility.

Main Menu

1. Save Current BIOS To File
This option allows you to save a copy of the original motherboard BIOS in case you need to reinstall it. It is recommended that you save AFLASH.EXE and the BIOS file to a bootable floppy disk.
To save your current BIOS, type [1] at the Main Menu and then press <Enter>. The Save Current BIOS To File screen appears. Type a filename and the path, for example, A:\440XX1 and then press <Enter>.
2. Update BIOS Including Boot Block and ESCD
This option updates the boot block, the baseboard BIOS, and the ACPI extended system configuration data (ESCD) parameter block from a new BIOS file. See the next page for procedures on downloading an updated BIOS file. To update your current BIOS, type [2] at the Main Menu and then press <Enter>. The Update BIOS Including Boot Block and ESCD screen appears. Type the filename of your new BIOS and the path, for example, A:\XX2I1002.AWD, and then press <Enter>. When prompted to confirm the BIOS update, press Y to start the update.
The utility starts to program the new BIOS information into the flash ROM. When the programming is finished, Flashed Successfully will be displayed.
Follow the onscreen instructions to continue.
IV. BIOS Flash Memory Writer
Managing and Updating Your Motherboards BIOS
Upon First Use of the Computer System 1. Create a bootable system floppy disk by typing [FORMAT A:/S] from the DOS prompt without creating AUTOEXEC.BAT and CONFIG.SYS files. 2. Copy AFLASH.EXE to the just created boot disk. 3. Run AFLASH.EXE from this new disk and select option 1. Save Current BIOS to File. See 1. Save Current BIOS To File on the previous page for more details and the rest of the steps. Updating BIOS Procedures (only when necessary) 1. Download an updated ASUS BIOS file from the Internet (WWW or FTP) or a BBS (Bulletin Board Service) (see ASUS CONTACT INFORMATION on page 3 for details) and save to the disk you created earlier. 2. Boot from the disk you created earlier. 3. At the A:\ prompt, type AFLASH and then press <Enter>. 4. At the Main Menu, type 2 and then press <Enter>. See 2. Update BIOS Including Boot Block and ESCD on the previous page for more details and the rest of the steps. WARNING! If you encounter problems while updating the new BIOS, DO NOT turn off your system since this might prevent your system from booting up. Just repeat the process, and if the problem still persists, update the original BIOS file you saved to disk above. If the Flash Memory Writer utility was not able to successfully update a complete BIOS file, your system may not be able to boot up. If this happens, your system will need service.

IV. BIOS Standard CMOS The preceding screen provides you with a list of options. At the bottom of this screen are the control keys. Take note of these keys and their respective uses. User-configurable fields appear in a different color. If you need information on the selected field, press <F1>. The help menu will then appear to provide you with the information you need. The memory display at the lower right of the screen is readonly and automatically adjusts accordingly.
Details of Standard CMOS Setup
Date To set the date, highlight the Date field and then press either <Page Up>/<Page Down> or <+>/<> to set the current date. Follow the month, day and year format. Valid values for month, day and year are: Month: (1 to 12), Day: (1 to 31), Year: (up to 2079)
Time To set the time, highlight the Time field and then press either <Page Up>/<Page Down> or <+>/<> to set the current time. Follow the hour, minute and second format. Valid values for hour, minute and second are: (Hour: (00 to 23), Minute: (00 to 59), Second: (00 to 59). If you do not want to modify the current time, press <Enter> three times to go to HARD DISKS. NOTE: You can bypass the date and time prompts by creating an AUTOEXEC.BAT file. For information on how to create this file, refer to the MS-DOS manual. Hard Disk Drives This field records the specifications for all non-SCSI hard disk drives installed in your system. The onboard PCI IDE connectors provide Primary and Secondary channels for connecting up to four IDE hard disks or other IDE devices. Each channel can support up to two hard disks; the first of which is the master and the second is the slave. Specifications for SCSI hard disks need not to be entered here since they operate using device drivers and are not supported by any the BIOS. If you install either the optional PCI-SC200 or PCI-SC860 SCSI controller card into the motherboard, see section VI for instructions. If you install other vendors SCSI controller card, refer to their respective documentations on how to install the required SCSI drivers. For IDE hard disk drive setup, you can: Use the Auto setting for detection during bootup. Use the IDE HDD AUTO DETECTION in the main menu to automatically enter the drive specifications. Enter the specifications yourself manually by using the User option. The entries for specifying the hard disk type include CYLS (number of cylinders), HEAD (number of read/write heads), PRECOMP (write precompensation), LANDZ (landing zone), SECTOR (number of sectors) and MODE. The SIZE field automatically adjusts according to the configuration you specify. The documentation that comes with your hard disk should provide you with the information regarding the drive specifications. The MODE entry is for IDE hard disks only, and can be ignored for MFM and ESDI drives. This entry provides three options: Normal, Large, LBA, or Auto (see below). Set MODE to the Normal for IDE hard disk drives smaller than 528MB; set it to LBA for drives over 528MB that support Logical Block Addressing (LBA) to allow larger IDE hard disks; set it to Large for drives over 528MB that do not support LBA. Large type of drive can only be used with MS-DOS and is very uncommon. Most IDE drives over 528MB support the LBA mode.

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 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 Disabled. Onboard IR (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. IR Mode (IrDA SIR) This motherboard supports IrDA compatible Serial Infrared (SIR) and Fast Infrared (FIR) communication modes. The FIR mode has two options: FIR/HP and FIR/ IBM, for computers or peripherals using HP and IBMs infrared transceivers, respectively. When using either FIR option, FIR DMA Select must be configured to reflect the DMA channel used by the port. FIR DMA Select (1) This allows you to configure the DMA channel used by the FIR port. Options are DMA 1 (default) or DMA 3. 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 sets the IDE UltraDMA to be active when using UltraDMA-capable IDE devices. The BIOS will automatically adjust or disable this setting for slower IDE devices so that Auto or high settings will not cause problems for older IDE devices. Choose Disable if you do not want this feature for all devices. 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. PIO and DMA timings can be independently set. The default setting of Auto will allow autodetection to ensure optimal performance.

Advanced Setup (optional)
If you wish to fine tune its settings for your monitor and system type, select Advanced Setup from the Main Menu. On-screen context sensitive help is displayed as you highlight each Advanced Menu item. WARNING! The Advanced Configuration option allows you to use certain features that may add additional performance to your device. However these options may not be compatible with your system. If problems appear after an advanced option is changed, returning the device to factory defaults will rectify the situation. Factory Defaults The device can be reset to factory defaults by pressing <Shift>+<F7>. Saving Your Configuration Once you have finished configuring the necessary parameters described above, save them by pressing <F10>.
B. Other V ideo Drivers Adv. / Diagnostics 70

Diagnostics

All installed graphics modes in the mach64 accelerator can be viewed and tested, by running the INSTALL program from the DOS prompt, or by running a diagnostics program called M64DIAG.EXE. Do not run it in a windowed or full-screen DOS box. In the INSTALL program, select Test Graphics Adapter from the Diagnostics. option of the Main Menu. The Test Graphics Adapter menu has the following options: VGA Tests. Accelerator Tests. Any time you suspect there is a problem, especially during installation, run the above tests. The information provided in this appendix will enable you to solve most problems.

Troubleshooting

System Lockup
If you are using a memory manager such as QEMM or 386MAX you need to modify the command line in the CONFIG.SYS file so that the address of the graphics device video BIOS, C000 - C7FF, is excluded. For example, add EXCLUDE = C000 - C7FF to the command line. Remove all unnecessary boards. Disable shadow RAM. Ensure that the board is seated correctly and that the device has been installed using the proper utilities. Try the device in a different system and reset to factory defaults using the INSTALL program. If the device works in another system, the problem is likely due to incorrect configuration.
Because a typical computer system consists of many different parts, difficulties may arise from a combination of items, from software or hardware installation, to monitor compatibility. Listed below are several checks you can make to help determine what the problem is. Test Patterns OK; Applications Do Not Sync The wrong monitor type has been selected. Change the settings in the INSTALL program. Windows Driver Not Installing Properly Windows must be running in 386 Enhanced Mode. Incompatible memory managers may prevent Windows from starting in enhanced mode. If this occurs, remove the offending driver or memory manager. Windows NT 4.0 driver cannot pass Test VGA. Please bypass Test VGA then load ATI drivers after completing installation. AutoCAD Driver Not Installing Properly If using a 386, ensure that AutoCAD has been configured for the appropriate ADI driver. The protected mode driver requires extended memory. Error Codes and Messages Problems and solutions for some common errors found by the test program are provided for your reference as follows:

B. Other V ideo Drivers Diagnostics
Memory aperture test failure or Diagnostics program locks or Reboots during aperture test If you receive an error message indicating that the memory aperture location is conflicting with your system memory, restart the INSTALL program as follows: INSTALL APMAP <Enter>. Now when you enable Memory Aperture, you must select a location above but not overlapping System Memory (S), BIOS (B) or Reserved (R) locations. Not applicable for ISA cards. Desired resolution is disabled and displayed in gray A mode displayed in gray means that the BIOS is told this mode is not available, based on the device configuration. Reinstall using custom monitor selection. Menu item is disabled and displayed in gray The test program has determined that the mode or test is not available under the current configuration. Aperture tests are not available if the aperture is disabled, and CRT mode and pixel depth are determined by current installation, DAC type, memory size, and memory type. Adapter not detected This message should only occur when a mach64 ASIC is not detected. If this message occurs and a mach64 board is present, it may indicate an I/O conflict, conflicts between the Extended Memory Manager (EMM) and the video ROM. Try removing all other boards from the system and booting from a plain DOS disk. Try excluding the video BIOS address (C0000-C7FFF) from the memory manager. Refer to the documentation furnished with the memory manager software for information. Any FIFO test error The effects of a bad command FIFO should be visible. (e.g., the screen does not come up, or it displays garbage.) Quick memory test error Run Detailed RAM Test to confirm the error and identify the address of the error. Detailed memory test error. Run Detailed RAM Test several times to confirm the error and take notes of any messages and error codes. DAC LUT test failure. An error has occurred while testing the DAC LookUp Table. The problem should be visible on the top color bar of any 8bpp mode. ROM checksum error. An error has been detected in the ROM. Draw sequence failure. An error has occurred in the draw engine. If the error is intermittent, it might indicate a marginal RAM failure. The effects of this failure may not be immediately apparent. B. Other V ideo Drivers Error Codes 72

Loop Track/ Playlist First Frame Advance File Name Previous Audio Track Track Select Open File Setup Dialog

Play/Stop

Full Screen

Rewind

Last Frame

Next Track

You can use the Media Playback panel to play the following media files: MPEG-1 digital audio and video, including Karaoke dual-channel audio, CDi, Games, and reference application titles *.AVI video files To play a file 1. 2. 3. 4. 5. In the Playback panel, click the File Open button Select a file from the list. Click Add, then click OK. Click the Play button The file plays in the Display panel.
Capture Open File Setup Dialog
Playing Interactive Discs (Video CD 2.0)

Menu Selection

Audio Track Select

Play Return Selection

Play Default
When playing Video CD 2.0 discs, the Control panel changes to this interactive panel.
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D. Audio Driver

When starting Windows 95/98/NT 4.0, the operating system will automatically detect the ESS Solo-1 PCI Audio Driver.

For Windows 95

1. When the New Hardware Found screen prompts for a driver, select Driver from disk provided by hardware manufacturer and insert the ASUS Support CD into your CD-ROM drive. 2. Click OK. 3. Click Browse. 4. Locate the D:\audio\w95 folder (where D is your CD-ROM Drive) and click OK. 5. Click OK again and the driver files will be copied. 6. Click Yes to restart the computer.

For Windows 98

1. When the Add New Hardware screen prompts you for a driver, select Display a list of all the drivers in a specific location, so you can select the driver you want and click Next. 2. Select Sound, video and game controllers and click Next. 3. Click Have Disk. 4. Insert the ASUS Support CD into your CD-ROM drive. 5. Click Browse. 6. Locate the D:\audio\w95 folder (where D is your CD-ROM Drive) and click OK. 7. Click OK again and the driver files will be copied. 8. Click Yes to restart the computer.
D. Audio Driver First Time Installation
When starting Windows 95/98/NT 4.0, the operating system will detect that you have a new PCI Multimedia Device. Click Next when the Update Device Wizard screen appears.
Click Other Locations to direct the wizard to the audio driver files.
Click Browse to locate the \audio\W95 folder for Windows 95/98 or the \audio\Nt40 folder for Windows NT on the ASUS Support CD. D. Audio Driver First Installation 80 Click OK to select the folder. Click OK and your device and driver location will be shown. Click Finish.

You will be prompted to insert the ASUS Support CD. Click OK.
Click Browse and locate the \audio\W95 (or \audio\Nt40) folder on the ASUS Support CD again. Follow the self-explanatory instructions to finish your driver installation.

For Windows NT 4.0

1. Run the Windows NT Multimedia program located in Control Panel. (Start->Settings->Control Panels->Multimedia) 2. Click the Devices tab. 3. Select Audio Devices under Multimedia Devices. 4. Click Add. 5. Select Unlisted or Updated Driver under List of Drivers. 6. Click OK. 7. When Windows prompts you for the driver location, click Browse. 8. Locate the D:\audio\Nt40 folder (where D is your CD-ROM Drive). A list of audio drivers will be displayed. 9. Select the driver for your audio chipset and click OK. Windows will prompt you to restart. 10. Click OK to restart the computer.
D. Audio Driver Windows NT 4.0

E. Audio Software

Audio Rack Installation
Reinsert your CD or double click on your CD drive icon in My Computer to bring up the autorun screen or run Setup.exe in the root directory of the CD. Click Install Audio Utilities from the main menu.

Audio Rack Introduction

The AudioRack32 enables you to take advantage of your computers audio capabilities with all of the controls conveniently in one compact space. You can play audio CDs, wave files (in.WAV and.AUD formats), and MIDI files (in.MID and.RMI formats). With the multisource Audio Mixer, you can blend these sources with linein and microphone sources any way you choose. You can then record your creations as wave files and edit them with the Audio Recorder. The AudioRack32 has six main parts: Command Centercustomizes the appearance of the AudioRack32. Audio Mixercontrols the volume and balance of the AudioRack32 devices. Digital Audio Playerplays and records files in the.WAV format. MIDI Playerenables you to play MIDI files. Compact Disk Playerenables you to play audio CDs on a CD-ROM drive. In addition, the AudioRack32 has a miniature mode enabling you to control the AudioRack32 while using minimal screen space. The Audio Recorder is a separate application from the AudioRack32. It can be used to add effects and edit files recorded with the Digital Audio Player or by the Audio Recorder itself. The Audio Recorder can be launched from the AudioRack32s Digital Audio Player or on its own.

Starting the ASUS DMI Configuration Utility
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.
G. DMI Utility DMI Introduction
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)
G. DMI Utility Using DMI Utility 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.
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
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.
G. DMI Utility Using DMI Utility