Intel Computer Hardware AN430TX User Manual

AN430TX

Motherboard

Specification Update

Release Date: September 1998

Order Number: 674301-016

The AN430TX motherboard may contain design defects or errors known as errata which may

cause the product to deviate from published specifications. Current characterized errata are

documented in this Specification Update.

CONTENTS

REVISION HISTORY ...............................................................................................................................v

PREFACE ...............................................................................................................................................vi

Specification Update for AN430TX Motherboards

GENERAL INFORMATION ......................................................................................................................3

SPECIFICATION CHANGES ...................................................................................................................9

ERRATA.................................................................................................................................................10

SPECIFICATION CLARIFICATIONS......................................................................................................16

DOCUMENTATION CHANGES .............................................................................................................18

This is a blank page

AN430TX SPECIFICATION UPDATE

REVISION HISTORY

Date of Revision

Version

Description

May 1997

-001

-002

-003

-004

This document is the first Specification Update for the Intel^®

AN430TX motherboard.

June 1997

July 1997

Added Specification Change 1, Specification Clarifications 1-3 and

Documentation Changes 1-3.

Added Erratum 4, Specification Clarification 4 and Documentation

Changes 4-9.

August 1997

Updated Documentation Changes 1 and 7-8. Added Specification

Clarification 5 and Documentation Change 10.

September 1997

October 1997

-005

-006

Updated Documentation Change 10. Added Errata 5 and 6.

Updated Erratum 3. Added Errata 7-10 and Documentation

Change 11.

November 1997

-007

Updated Errata 9-10 and Documentation Change 11. Added

Erratum 11 and Documentation Changes 12-13.

December 1997

January 1998

February 1998

April 1998

-008

-009

-010

-011

-012

-013

-014

Added Erratum 12 and Specification Clarifications 6-7.

Added Errata 13-14 and Specification Clarification 8.

Added Erratum 15.

Added Erratum 16 and Documentation Change 14.

Added Errata 17-18. Updated Errata 5, 13 and 16.

Added Documentation Change 15.

May 1998

June 1998

July 1998

Added Erratum 19 and Documentation Change 16. Updated

status of Erratum 16.

August 1998

-015

-016

Added Erratum 20.

September 1998

Added Erratum 21. Updated status of Erratum 20.

AN430TX SPECIFICATION UPDATE

PREFACE

This document is an update to the specifications contained in the AN430TX Motherboard Technical Product

Specification (Order Number 282955). It is intended for hardware system manufacturers and software

developers of applications, operating systems, or tools. It will contain Specification Changes, Errata,

Specification Clarifications, and Documentation Changes.

Refer to the Pentium Processor Specification Update (Order Number 242480) for specification updates

concerning the Pentium processor. Items contained in the Pentium Processor Specification Update that

either do not apply to the AN430TX motherboard or have been worked around are noted in this document.

Otherwise, it should be assumed that any processor errata for a given stepping are applicable to the Printed

Board Assembly (PBA) revision(s) associated with that stepping.

Refer to the 82430TX PCIset Specification Update (Order Number 297736) for specification updates

concerning the 82430TX PCIset. Items contained in the 82430TX PCIset Specification Update that either do

not apply to the AN430TX motherboard or have been worked around are noted in this document. Otherwise,

it should be assumed that any PCIset errata for a given stepping are applicable to the Printed Board

Assembly (PBA) revision(s) associated with that stepping.

Refer to the 82371AB PIIX4 Specification Update (Order Number 297738) for specification updates

concerning the 82371AB PIIX4. Items contained in the 82371AB PIIX4 Specification Update that either do

not apply to the AN430TX motherboard or have been worked around are noted in this document. Otherwise,

it should be assumed that any PCIset errata for a given stepping are applicable to the Printed Board

Assembly (PBA) revision(s) associated with that stepping.

Nomenclature

Specification Changes are modifications to the current published specifications. These changes will be

incorporated in the next release of the specifications.

Errata are design defects or errors. Characterized errata may cause the AN430TX motherboard’s behavior

to deviate from published specifications. Hardware and software designed to be used with any given Printed

Board Assembly (PBA) and BIOS revision level must assume that all errata documented for that PBA and

BIOS revision are present on all motherboards.

Specification Clarifications describe a specification in greater detail or further highlight a specification’s

impact to a complex design situation. These clarifications will be incorporated in the next release of the

specifications.

Documentation Changes include typos, errors, or omissions from the current published specifications.

These changes will be incorporated in the next release of the specifications.

Specification Update for

AN430TX Motherboards

This is a blank page

AN430TX SPECIFICATION UPDATE

GENERAL INFORMATION

Basic AN430TX Motherboard Identification Information

82430TX PCIset

Stepping

AA Revision

672839-304

672839-305

672839-306

672839-307

672839-308

672839-309

680905-302

680905-303

680905-304

680905-305

PBA Revision

669379-304

669379-305

669379-306

669379-307

669379-308

669379-309

680904-302

680904-303

680904-304

680904-305

BIOS Revision

Notes

4A3NT0X0.86A.0042.P02

4A3NT0X0.86A.0047.P03

4A3NT0X0.86A.0062.P06

4A3NT0X0.86A.0047.P03

4A3NT0X0.86A.0062.P06

1, 2, 3, 4, 5

NOTES:

The AA/PBA number is found on a small label on the component side of the board.

The 82430TX PCIset kit used on this PBA revision consists of two different components as follows:

Device

Stepping

S-Spec Numbers

82439TX

82371AB

L238

L23P

The following errata contained in the 82430TX PCIset Specification Update (Order Number 297736) either do not apply to

the AN430TX motherboard or have been worked around in this PBA and/or BIOS revision: 1S, 2S. All other errata

associated with the PCIset apply to this PBA revision. For specific details of any erratum please refer to the 82430TX

PCIset Specification Update.

The following errata contained in the 82371AB PIIX4 Specification Update (Order Number 297738) either do not apply to

the AN430TX motherboard or have been worked around in this PBA and/or BIOS revision. All other errata associated

with the PCIset apply to this PBA revision. For specific details of any erratum please refer to the 82371AB

PIIX4-Specification Update.

The following errata contained in Part I of the Pentium Processor Specification Update (Order Number 242480) either do

not apply to the AN430TX motherboard or have been worked around in this PBA and/or BIOS revision: 5, 7, 9-11, 13-14,

16-17, 29, 31, 34, 36-37, 39, 40, 46, 48-50, 58, 60-64, 66-67, 69, 71, all DP errata, all AP errata, all TCP errata. All other

errata in Part I may apply to this revision level of the motherboard, depending on the stepping of the processor or the

specific software that is being executed. Also, some of these errata apply only to motherboards being used in an

application development environment. For specific details of any erratum please refer to the Pentium Processor

Specification Update.

AN430TX SPECIFICATION UPDATE

Summary Table of Changes

The following table indicates the Specification Changes, Errata, Specification Clarifications, or Documentation

Changes which apply to the AN430TX motherboard. Intel intends to fix some of the errata in a future revision

of the motherboard, and to account for the other outstanding issues through documentation or specification

changes as noted. This table uses the following notations:

CODES USED IN SUMMARY TABLE

Doc:

Fix:

Document change or update that will be implemented.

This erratum is intended to be fixed in a future revision of the motherboard or

BIOS.

Fixed:

This erratum has been previously fixed.

NoFix:

Shaded:

There are no plans to fix this erratum.

This erratum is either new or modified from the previous version of the document.

NO. PLANS

SPECIFICATION CHANGES

Support for 233 MHz Pentium processors with MMX technology

ERRATA

Doc

NO. PLANS

NoFix System does not meet FCC Class B with unshielded USB cables

NoFix Audio driver does not support Windows* 3.x session within OS/2* Warp*

Fixed

System BIOS does not recognize bootable USB devices

NoFix Video corruption or no video on boot

Fixed

Fix

Memory decrease warning message not displayed

Hard drive not detected on boot if user defined

Fixed

Fix

Intel^®EtherExpress™ Pro/100B fails to initialize with Windows 95

Potential battery drain if no AC power applied

LS-120 drive does not work as expected in Windows 95

Serial mouse activity does not wake system after APM shutdown

Stuck or depressed key during POST may cause system hang

Unable to define IDE heads value for secondary IDE hard drive in BIOS Setup

System BIOS may corrupt audio add-in card EEPROM

Fix

Fixed

NoFix Windows 95 will not boot if LS-120 drive is only device on IDE channel

NoFix Advanced Power Management may suspend system during CD-ROM playback

Fixed

BIOS does not correctly size 64 MB or larger DIMMs

System will not boot with network as first boot device

Unattended start feature does not require password before boot

System BIOS does not display user logo during POST

AN430TX SPECIFICATION UPDATE

NO. PLANS

ERRATA

NoFix System using 3-mode floppy drive cannot read XDF format diskettes

NoFix System will not boot from ISA video adapter if Scan User Flash is enabled

NO. PLANS

SPECIFICATION CLARIFICATIONS

Doc

Advanced Power Management (APM) will not function as expected with Universal Serial Bus

(USB) enabled

Doc

LS-120 drive and floppy will not function as expected for BIOS recovery

PCI 2.1 Specification optional features

Supervisor and user passwords

Power supply considerations

LS-120 drive configured as a boot device

Resource allocation with all PCI slots used

Using shift print screen in BIOS Setup

NO. PLANS

DOCUMENTATION CHANGES

Doc

Revision of Section 1.6.1, “Main Memory”

Addition of “Power On” section

Revision of Section 5.1, “Specifications”

Revision of Section 1.7.1, “82439TX System Controller (MTXC)”

Revision of Section 1.12, “Add-In Board Expansion Connectors”

Revision of Section 1.13.1, “Processor Configuration (J9C1-C, D)”

Revision of Section 1.6.1.1, “EDO DRAM”

Revision of Section 1.8.1, “Serial Ports”

Revision of Section 1.13.3, “Clear CMOS (J9C1-A)”

Revision of Section 1.16.1, “Power Supply Considerations”

Revision of Section 3.1.12, “USB Support”

Addition of “BIOS Beep Codes” section

Revision of Section 3.1.4, “PCI IDE Support”

Revision of video memory address

Change to description of Manufacturing Options

Addition of section describing real time clock

AN430TX SPECIFICATION UPDATE

The errata described in this specification update apply to combinations of PBA revision and BIOS revision as

shown in the table below. Descriptions of the individual errata referred to by number in the table below are

found in the ERRATA section of this document.

PBA Revision

BIOS Revision

Errata That Apply

1-3, 5-15, 17-18, 20-21

669379-304

4A3NT0X0.86A.0042.P02

4A3NT0X0.86A.0047.P03

4A3NT0X0.86A.0062.P06

1-2, 5-6, 8, 10-11, 14-15, 17-18, 20-

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

4A3NT0X0.86A.0042.P02^‡

4A3NT0X0.86A.0047.P03

4A3NT0X0.86A.0062.P06

1-2, 6, 8, 10-11, 14-16, 18-21

1-2, 6, 8, 10-11, 14-16, 19-21

1-2, 6, 8, 10-11, 14-15, 20-21

1-3, 5-15, 17-18, 20-21

669379-305

669379-306

669379-307

1-3, 5-15, 17-18, 20-21

1-2, 5-6, 8, 10-11, 14-15, 17-18, 20-

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

4A3NT0X0.86A.0042.P02^‡

4A3NT0X0.86A.0047.P03

4A3NT0X0.86A.0062.P06

1-2, 6, 8, 10-11, 14-16, 18-21

1-2, 6, 8, 10-11, 14-16, 19-21

1-2, 6, 8, 10-11, 14-15, 20-21

1-3, 5-15, 17-18, 20-21

1-2, 5-6, 8, 10-11, 14-15, 17-18, 20-

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

4A3NT0X0.86A.0042.P02^‡

4A3NT0X0.86A.0047.P03

4A3NT0X0.86A.0062.P06

1-2, 6, 8, 10-11, 14-16, 18-21

1-2, 6, 8, 10-11, 14-16, 19-21

1-2, 6, 8, 10-11, 14-15, 20-21

1-3, 5-15, 17-18, 20-21

1-2, 5-6, 8, 10-11, 14-15, 17-18, 20-

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

1-2, 6, 8, 10-11, 14-16, 18-21

1-2, 6, 8, 10-11, 14-16, 19-21

1-2, 6, 8, 10-11, 14-15, 20-21

AN430TX SPECIFICATION UPDATE

PBA Revision

BIOS Revision

Errata That Apply

1-3, 5-15, 17-18, 20-21

669379-308

4A3NT0X0.86A.0042.P02^‡

4A3NT0X0.86A.0047.P03^‡

4A3NT0X0.86A.0062.P06

1-2, 5-6, 8, 10-11, 14-15, 17-18, 20-

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

4A3NT0X0.86A.0042.P02^‡

4A3NT0X0.86A.0047.P03^‡

4A3NT0X0.86A.0062.P06

1-2, 6, 8, 10-11, 14-16, 18-21

1-2, 6, 8, 10-11, 14-16, 19-21

1-2, 6, 8, 10-11, 14-15, 20-21

1-3, 5-15, 17-18, 20-21

669379-309

1-3, 5-15, 17-18, 20-21

1-2, 5-6, 8, 10-11, 14-15, 17-18, 20-

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

4A3NT0X0.86A.0042.P02^‡

4A3NT0X0.86A.0047.P03

4A3NT0X0.86A.0062.P06

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

4A3NT0X0.86A.0042.P02^‡

4A3NT0X0.86A.0047.P03

4A3NT0X0.86A.0062.P06

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

1-2, 6, 8, 10-11, 14-16, 18-21

1-2, 6, 8, 10-11, 14-16, 19-21

1-2, 6, 8, 10-11, 14-15, 20-21

1-7, 9-15, 17-18, 20-21

680904-302

1-7, 9-15, 17-18, 20-21

1, 2, 4-6, 10-11, 14-15, 17-18, 20-21

1-2, 4, 6, 10-11, 14-16, 18-21

1-2, 4, 6, 10-11, 14-16, 19-21

1-2, 4, 6, 10-11, 14-15, 20-21

1-7, 9-15, 17-18, 20-21

680904-303

1-7, 9-15, 17-18, 20-21

1, 2, 4-6, 10-11, 14-15, 17-18, 20-21

1-2, 4, 6, 10-11, 14-16, 18-21

1-2, 4, 6, 10-11, 14-16, 19-21

1-2, 4, 6, 10-11, 14-15, 20-21

AN430TX SPECIFICATION UPDATE

PBA Revision

BIOS Revision

Errata That Apply

1-7, 9-15, 17-18, 20-21

680904-304

4A3NT0X0.86A.0042.P02^‡

4A3NT0X0.86A.0047.P03^‡

4A3NT0X0.86A.0062.P06

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

4A3NT0X0.86A.0042.P02^‡

4A3NT0X0.86A.0047.P03^‡

4A3NT0X0.86A.0062.P06

4A3NT0X0.86A.0082.P07

4A3NT0X0.86A.0086.P08

4A3NT0X0.86A.0088.P09

1-7, 9-15, 17-18, 20-21

1, 2, 4-6, 10-11, 14-15, 17-18, 20-21

1-2, 4, 6, 10-11, 14-16, 18-21

1-2, 4, 6, 10-11, 14-16, 19-21

1-2, 4, 6, 10-11, 14-15, 20-21

1-7, 9-15, 17-18, 20-21

680904-305

1-7, 9-15, 17-18, 20-21

1, 2, 4-6, 10-11, 14-15, 17-18, 20-21

1-2, 4, 6, 10-11, 14-16, 18-21

1-2, 4, 6, 10-11, 14-16, 19-21

1-2, 4, 6, 10-11, 14-15, 20-21

NOTE:

‡

This combination of BIOS revision and PBA revision has not undergone regression testing. Use of a PBA with down-

revision BIOS is an untested combination and is undertaken at the user’s risk.

AN430TX SPECIFICATION UPDATE

SPECIFICATION CHANGES

The Specification Changes listed in this section apply to the AN430TX Motherboard Technical Product

Specification (Order Number 282955). All Specification Changes will be incorporated into a future version of

that specification.

Support for 233 MHz Pentium processors with MMX technology

Support for 233 MHz Pentium processors with MMX technology is available in PBA revision 669379-304,

680904-302 and higher. Below are the jumper settings:

Processor

Freq. (MHz)

Jumpers

J9C1-C

Jumpers

J9C1-D

Host Bus

Freq. (MHz)

PCI Bus

Freq. (MHz)

ISA Bus

Freq. (MHz)

Bus/Processor

Freq. Ratio

100/233

5-6

1-2 and 4-5 66

8.33

1.5

NOTE:

There are no additional jumpering requirements for Pentium processors with MMX technology.

The 100 MHz Pentium processor and the 233 MHz Pentium processor with MMX technology have identical jumper

settings. The motherboard automatically detects which processor type is installed.

AN430TX SPECIFICATION UPDATE

ERRATA

System Does Not Meet FCC Class B with Unshielded USB Cables

PROBLEM: The motherboard will generate excessive electromagnetic radiation on unshielded USB cables,

even if no device or a low speed (sub-channel) USB device is attached to the cable.

IMPLICATION: The system will not meet FCC Part 15 Class B requirements when unshielded USB cable is

used. This is a violation of the USB v1.0 specification.

WORKAROUND: Use USB devices with shielded cable that meet the requirements for high speed (fully-rated)

USB devices.

STATUS: This erratum will not be fixed.

Audio Driver Does Not Support Windows* 3.x Session Within OS/2*

Warp*

PROBLEM: The AN430TX motherboard audio drivers for OS/2* Warp* or Windows* 3.x do not support audio

during a Windows 3.x session within OS/2 Warp.

IMPLICATION: No audio is available during a Windows 3.x session within OS/2 Warp. Normal audio support

will be available in native OS/2 Warp.

WORKAROUND: None.

STATUS: This erratum will not be fixed.

System BIOS Does Not Recognize Bootable USB Devices

PROBLEM: The system BIOS does not recognize a USB keyboard or mouse during a system boot. A USB

keyboard or mouse is not recognized until an operating system that supports USB is loaded.

IMPLICATION: 1. The user is not able to use a USB keyboard to enter the BIOS Setup or to respond to error

messages that are displayed before an operating system with USB support is loaded.

2. The user is not able to use a USB keyboard or mouse with any operating system that does not have USB

support.

WORKAROUND: Use a standard PS/2* style keyboard and mouse in any configuration where input is

required before an operating system with USB support is loaded.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0062.P06.

Video Corruption or No Video on Boot

PROBLEM: An ATI* 264GTU device initialization problem will occur on power up when the power supply

ramping of the 3.3 V leads the 5.0 V by 5 ms or more. The 2.01 ATX Specification recommends that the

3.3 V DC rails always be held at a lower potential than the 5 V DC rails during power-up and power-down

transition.

IMPLICATION: The onboard video device will not initialize causing the system to display video corruption or

no video on boot.

AN430TX SPECIFICATION UPDATE

WORKAROUND: Use a power supply that meets the recommendation in the 2.01 ATX Specification.

STATUS: This erratum will not be fixed.

Memory Decrease Warning Message Not Displayed

PROBLEM: During POST, the BIOS will not generate and display a memory decrease warning message on

the screen.

IMPLICATION: The user will not be warned about a decrease in the amount of memory.

WORKAROUND: None.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0082.P07.

Hard Drive Not Detected on Boot if User Defined

PROBLEM: If the drive type in BIOS Setup is set to USER, the hard drive will not be detected by the

motherboard at boot.

IMPLICATION: The hard drive will not be detected by the BIOS during the boot process and will not be

available to the operating system.

WORKAROUND: None.

STATUS: This erratum will be fixed in a future BIOS revision.

Intel^®EtherExpress^™Pro/100B Fails to Initialize With Windows* 95

PROBLEM: The system BIOS allocates 48 KB of memory at location C000H:0 rather than 44 KB as

expected.

IMPLICATION: Since the EtherExpress™ Pro/100B attempts to map memory starting at location CB00H:0 by

default, this results in a resource conflict with the system BIOS. Therefore, Windows* 95 will be unable to

initialize the EtherExpress Pro/100B and an exclamation mark will be displayed in Device Manager for this

device.

WORKAROUND: Manually move the EtherExpress Pro/100B memory range to D000 or higher in Windows 95

Device Manager.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0062.P06.

Potential Battery Drain if No AC Power Applied

PROBLEM: A potential battery drain condition caused by the AC power loss recovery circuit can cause the

battery to source approximately 500 µA current instead of the typical 3 µA drawn when the system is powered

off. This drain condition can occur if AC power is removed from the power supply and the front panel on/off

switch is depressed.

IMPLICATION: The excessive battery drain state can result in a shortened battery life. The battery will drain

completely over a period of 3 to 4 weeks if left in this state. Reapplying AC power eliminates the excessive

battery drain condition. A battery that has been completely drained will cause a CMOS checksum error to be

displayed the next time that the system is powered on.

AN430TX SPECIFICATION UPDATE

WORKAROUND: None.

STATUS: This erratum was fixed in PBA revision 669379-306.

LS-120 Drive Does Not Work as Expected in Windows* 95

PROBLEM: After restarting Windows* 95 from MS-DOS* mode, the system BIOS does not configure the

diskette parameter table correctly if an LS-120 drive is the only floppy drive in the system.

IMPLICATION: Windows 95 will report the LS-120 drive as a hard drive instead of a floppy drive and will report

a floppy drive available as Drive A. If drive A is subsequently accessed, the system will lock up. The

problem does not occur if a 1.44 MB 3-1/2” floppy drive is also present as either drive A or drive B.

WORKAROUND: None.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0062.P06.

10.

Serial Mouse Activity Does Not Wake System After APM Shutdown

PROBLEM: The system BIOS does not recognize activity from a serial mouse as an APM event.

IMPLICATION: The system will not be restored from a power-managed state until keyboard activity occurs.

WORKAROUND: The system BIOS does recognize activity from a PS/2* style mouse.

STATUS: This erratum will be fixed in a future BIOS revision.

11.

Stuck or Depressed Key During POST May Cause System Hang

PROBLEM: The BIOS is unable to detect when a key on the keyboard is stuck or depressed during Power

On Self Test (POST).

IMPLICATION: If a key is stuck or depressed during POST, the system BIOS will continue to read data from

the keyboard, resulting in a system hang condition.

WORKAROUND: None.

STATUS: This erratum will be fixed in a future BIOS revision.

12.

Unable to Define IDE Heads Value for Secondary IDE Hard Drive in

BIOS Setup

PROBLEM: The Secondary IDE Master/Slave Configuration Submenu in BIOS Setup does not display a field

for the number of hard disk drive heads and has no value assigned for it in manual configuration mode.

IMPLICATION: Since BIOS setup does not allow the user to define the number of hard disk heads, thus the

system BIOS cannot detect the secondary IDE hard drive.

WORKAROUND: None.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0062.P06.

AN430TX SPECIFICATION UPDATE

13.

System BIOS May Corrupt Audio Add-In Card EEPROM

PROBLEM: Audio add-in cards using the Yamaha OPL3-SA2 or OPL3-SA3 audio codec have the same

hardware identification number that is used by the Yamaha audio device integrated on the motherboard. This

causes the system BIOS to inadvertently write information into the audio add-in card’s serial EEPROM during

system startup, thereby corrupting the audio add-in card’s EEPROM contents.

IMPLICATION: The audio add-in card will not operate and no audio will be available.

WORKAROUND: Disable the onboard audio in BIOS Setup before installing an audio add-in card.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0062.P06.

14.

Windows* 95 Will Not Boot if LS-120 Drive is Only Device on IDE

Channel

PROBLEM: An LS-120 drive will not be recognized by Windows* 95 if it is the only device on the IDE

channel.

IMPLICATION: If an LS-120 drive is the only device on an IDE channel, a black screen with a cursor blinking

in the upper left hand corner will be displayed when Windows 95 is starting to boot and the system will hang.

WORKAROUND: The LS-120 drive is recognized when connected as either the master or the slave on an IDE

channel with another device.

STATUS: This erratum will not be fixed.

15.

Advanced Power Management May Suspend System During CD-

ROM Playback

PROBLEM: ATAPI devices (such as CD-ROM and DVD drives) do not reset the inactivity timer that is used

by Advanced Power Management to determine when to place the system into suspend mode.

IMPLICATION: When playback of an audio CD or a DVD file is the only system activity, the system will go into

suspend mode when the inactivity timer expires.

WORKAROUND: Temporarily disable the Low-power standby and Shut off monitor options on the Display

Properties, Screen Saver menu. This menu is available from the Windows 95 Control Panel.

STATUS: This erratum will not be fixed.

16.

BIOS Does Not Correctly Size 64 MB or Larger DIMMs

PROBLEM: Because of an incorrect register setting in the memory controller, the BIOS may not correctly

identify the size of 64 MB or larger DIMMs.

IMPLICATION: Only 16 MB of the memory will be reported by the power on self-test (POST). The additional

memory will not be available to the operating system. This erratum applies only to BIOS revision

4A3NT0X0.86A.0082.P07 and later.

WORKAROUND: None.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0088.P09.

AN430TX SPECIFICATION UPDATE

17.

System Will Not Boot with Network as First Boot Device

PROBLEM: The feature allowing the system to boot from the network is not implemented. After the attempt

to boot from a network device selected as the first boot device fails, the system BIOS does not attempt to

boot from any additional boot devices specified in the BIOS Setup program.

IMPLICATION: If Network boot is selected as the first boot device, the system will hang.

WORKAROUND: Remove Network boot from the boot sequence.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0082.P07.

18.

Unattended Start Feature Does Not Require Password Before Boot

PROBLEM: The Unattended Start feature at power on allows the system to boot without any password being

entered at the keyboard, even though a user or administrator password has been set in the BIOS Setup

program.

IMPLICATION: A system that is booted without an operator in attendance could be vulnerable to unauthorized

access.

WORKAROUND: None.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0086.P08.

19.

System BIOS Does Not Display User Logo During POST

PROBLEM: The status bit that allows display of a user logo during the POST process is disabled in some

versions of the BIOS.

IMPLICATIONS: If a user logo has been defined and loaded in the user logo flash memory area, it will not be

displayed. This erratum only affects BIOS versions 4A3NT0X0.86A.0082.P07 and later.

WORKAROUND: None.

STATUS: This erratum was fixed in BIOS revision 4A3NT0X0.86A.0088.P09.

20.

System Using 3-Mode Floppy Drive Cannot Read XDF Format

Diskettes

PROBLEM: The buffer area that stores floppy drive parameters does not have room to store the speed

information to allow a 3-mode floppy drive to read a diskette in the XDF format.

IMPLICATION: A system that has a 3-mode floppy drive cannot be used to install a program or operating

system, such as PC-DOS 7.0, that is distributed on XDF format diskettes.

WORKAROUND: None.

STATUS: This erratum will not be fixed.

AN430TX SPECIFICATION UPDATE

System Will Not Boot From ISA Video Adapter if Scan User Flash is

Enabled

PROBLEM: If the option to scan the user flash area during the boot process is enabled in the BIOS setup

program, the system will hang when the BIOS attempts to initialize an ISA video adapter. This erratum does

not affect PCI video adapters.

IMPLICATION: A user who requires an ISA video adapter will not be able to use the scan user flash area

option.

WORKAROUND: None.

STATUS: This erratum will not be fixed.

AN430TX SPECIFICATION UPDATE

SPECIFICATION CLARIFICATIONS

The Specification Clarifications listed in this section apply to the AN430TX Motherboard Technical Product

Specification (Order Number 282955). All Specification Clarifications will be incorporated into a future version

of that specification.

Advanced Power Management (APM) Will Not Function as

Expected with Universal Serial Bus (USB) Enabled

The following will be added to Section 1.7.3, Universal Serial Bus and Section 3.1.8, Advanced Power

Management:

Advanced Power Management will not function as expected when a USB keyboard or mouse is used. USB

activity is not monitored by the APM event counter, therefore, activity from a USB keyboard or mouse will not

keep the system awake or bring a system out of APM sleep mode. If a USB keyboard or mouse is being

used, APM should be disabled.

LS-120 Drive and Floppy Will Not Function as Expected for BIOS

Recovery

The following note will be added to Section 3.1.14, Recovering BIOS Data:

The LS-120 drive does not work as a legacy floppy drive when attempting to perform a BIOS recovery. A

1.44 MB disk must be used in place of an LS-120 disk in the LS-120 drive for BIOS recovery.

PCI 2.1 Specification Optional Features

The following will be added to Section 1.12, Add-in Board Expansion Connectors:

The following optional features in the PCI 2.1 Specification are not implemented on the AN430TX

motherboard:

•

Cache Support Pins SBO# and SDONE (Section 2.2.7)

PRSNTx# (Section 2.2.8)

CLKRUN# (Section 2.2.8)

64 Bit Bus Extension Pins (Section 2.2.9)

66 MHz support (Section 2.2.8)

JTAG/Boundary scan (Section 2.2.10)

Supervisor and User Passwords

The following will be added to Section 3.2.5, Security Menu:

If a supervisor password has been set, but no user password has been set, a user can create a password by

entering BIOS Setup at boot by pressing the F2 key and pressing enter at the supervisor password prompt.

Once in Setup, a user will be able to create a new user password.

AN430TX SPECIFICATION UPDATE

Once defined, a user password can be cleared by either defining a new user password in BIOS Setup, or by

moving the Password Clear jumper (J9C1-A) on the motherboard. See Section 1.13.2, Password Clear for

more information on how to use this jumper.

Power Supply Considerations

The AN430TX motherboard has been designed to be configured in a system that uses a power supply that

complies with the recommendations of ATX Specification Version 2.01. See Documentation Change 10 for

the specific recommendations that must be met by a power supply for the motherboard.

LS-120 Drive Configured as a Boot Device

The second paragraph in Section 1.7.4.1, LS-120 Support will be replaced in its entirety as follows:

The motherboard allows connection of an LS-120 compatible drive and a standard 3.5-inch diskette drive.

The LS-120 drive can be configured as a boot device, if selected as a floppy device in the BIOS setup utility.

Resource Allocation With All PCI Slots Used

The BIOS assigns resources to PCI boot devices (video cards and SCSI controllers, for example) during

POST when Plug and Play is enabled in BIOS Setup. PCI and ISA non-boot devices (network cards and

audio, for example) will not have resources assigned by the BIOS during POST. A Plug and Play operating

system assigns resources to PCI and ISA non-boot devices when it loads.

Using Shift Print Screen in BIOS Setup

In order to use the Shift Print Screen function to print screens from BIOS Setup, PnP OS must be set to no.

If PnP OS is set to yes in BIOS Setup, the Shift Print Screen function will not work. The BIOS does not

assign resources to the parallel port when PnP OS is set to yes in BIOS Setup. Resources for the parallel

port will be allocated by the plug and play operating system when it loads. If PnP OS is set to no, the BIOS

allocates resources to the parallel port.

AN430TX SPECIFICATION UPDATE

DOCUMENTATION CHANGES

The Documentation Changes listed in this section apply to the AN430TX Motherboard Technical Product

Specification (Order Number 282955). All Documentation Changes will be incorporated into a future version

of the appropriate AN430TX motherboard documentation.

Revision of Section 1.6.1, Main Memory

This section will be replaced in its entirety as follows:

The motherboard has two 168-pin DIMM sockets. Memory can be installed in one or two sockets. Minimum

memory size is 8 MB. Maximum memory size is 128 MB for EDO memory and 256 MB SDRAM memory.

The BIOS automatically detects memory type, size, and speed so no jumper settings are required.

The motherboard supports the following:

•

168-pin 3.3 V DIMMs with gold-plated contacts

60 and 66 MHz bus speeds

60 ns 3.3 V EDO DRAM

Unrestricted CAS Latency 2 unbuffered 4-clock 3.3 V SDRAM

Caching for the first 64 MB of main memory

64-bit data path

Single- or double-sided DIMMs in the following sizes:

DIMM Size

8 MB

Type

Configuration

1M x 64

Technology

16 Mbit

60 ns EDO

16 MB

32 MB

64 MB

8 MB

2M x 64

4M x 64

8M x 64

1M x 64

2M x 64

4M x 64

8M x 64

16M x 64

16 Mbit

64 Mbit

CAS Latency 2 SDRAM

16 MB

32 MB

64 MB

128 MB

Memory type, size, and speed can vary between sockets, so EDO and SDRAM can be installed on the same

motherboard. 168-pin parity DIMMs can be installed but are not recommended for the following reasons:

•

The motherboard does not provide parity checking or ECC

Parity DIMMs cause excessive capacitive loading on memory data and address lines

AN430TX SPECIFICATION UPDATE

Addition of Power On Section

The following will be added to Section 1.11.2, Front Panel Connectors:

POWER ON

This header must be connected to a front panel power switch. The switch must pull the SW_ON# pin to

ground for at least 50 ms to signal the power supply to switch on or off. (The time requirement is due to the

motherboard’s internal debounce circuitry.) At least two seconds must pass before the motherboard will

recognize another on/off signal. The system will turn on for 300 ms when AC power is first applied to the

board.

CAUTION

If you need to turn off the computer during POST or because of a system lock-up, hold the power

switch in for four seconds; otherwise the computer will not switch off.

Revision of Section 5.1, Specifications

The following note will be added to the table entry for PCI compliance:

NOTE: Certain optional PCI features have not been implemented on this motherboard, see section 1.14 for more information.

Revision of Section 1.7.1, 82439TX System Controller (MTXC)

The fourth bullet in this section will be replaced in its entirety as follows:

•

Fully synchronous minimum latency PCI bus interface

PCI compliance (see Section 5.1 for compliance level)

30 and 33 MHz bus speeds

PCI to DRAM data transfers up to or greater than 100 MB/sec

Up to four PCI masters in addition to the PIIX4

Revision of Section 1.12, Add-In Board Expansion Connectors

The text in the first paragraph of this section will be replaced in its entirety as follows:

The motherboard Expansion Slots support up to four bus mastering PCI and up to three ISA add-in boards.

One of the PCI slots may be shared with an ISA slot.

Revision of Section 1.13.1, Processor Configuration (J9C1-C, D)

The following note will be added to the bottom of Table 30 in this section:

NOTE:

Pins 1, 2 and 3 on Jumper J9C1-C are not used.

AN430TX SPECIFICATION UPDATE

Revision of Section 1.6.1.1, EDO DRAM

The following will be added to the end of this section:

EDO DIMM should meet the Intel 60 ns 64-bit 3.3 V unbuffered EDO DIMM v1.2 specification.

CAUTION

Due to loading anomalies, using EDO DIMMs with a n x 4 DRAM base in the AN430TX motherboard

is not recommended. For example, a DIMM that uses sixteen 16 Mbit x 4 devices should not be

used.

Revision of Section 1.8.1, Serial Ports

This section will be replaced in its entirety as follows:

The motherboard has one 9-pin D-Sub serial port connector located on the back panel, and one keyed 10-pin

header located on the motherboard for cabling to the back panel. The 16540 and 16550A compatible UARTs

allow data transfers at speeds up to 115.2 Kbaud with BIOS serial port support.

Revision of Section 1.13.3, Clear CMOS (J9C1-A)

This section will be replaced in its entirety as follows:

Allows CMOS settings to be reset to default values by moving the jumper from pins 4-5 to pins 5-6 and

turning the system on. When the system reports that “NVRAM cleared by jumper”, the system can be turned

off, and the jumper should be returned to the 4-5 position to restore normal operation. Default is for this

jumper to be on pins 4-5.

Caution: This procedure should only be done if, after a BIOS update, the system does not boot to a point

where Setup can be entered or if, after CMOS default settings have been restored from within the Setup

program, the system does not boot to the operating system.

10.

Revision of Section 1.16.1, Power Supply Considerations

This section will be replaced in its entirety as follows:

For typical configurations, the motherboard is designed to operate with at least a 200 W power supply (see

Section 5.1 for the specification). A higher-wattage power supply should be used for heavily-loaded

configurations. The power supply must comply with the following recommendations found in the indicated

sections of that specification:

•

The potential relation between 3.3VDC and +5VDC power rails (Section 4.2)

All timing parameters (Section 4.2.1.3)

All voltage tolerances (Section 4.2.2)

AN430TX SPECIFICATION UPDATE

11.

Revision of Section 3.1.12, USB Support

This section will be replaced in its entirety as follows:

USB LEGACY SUPPORT

USB legacy support enables USB keyboards and mice to be used even when no operating system USB

drivers are in place. By default, USB legacy support is disabled. USB legacy support is only intended to be

used in accessing BIOS Setup and installing an operating system that supports USB.

This sequence describes how USB legacy support operates in the default (disabled) mode.

1. When you power up the computer, USB legacy support is disabled.

2. POST begins.

3. USB legacy support is temporarily enabled by the BIOS. This allows you to use a USB keyboard to enter

the Setup program or the maintenance mode.

4. POST completes and disables USB legacy support (unless it was set to Enabled while in Setup).

5. The operating system loads. While the operating system is loading, USB keyboards and mice are not

recognized. After the operating system loads the USB drivers, the USB devices are recognized.

To install an operating system that supports USB, enable USB Legacy support in BIOS Setup and follow the

operating system’s installation instructions. Once the operating system is installed and the USB drivers

configured, USB legacy support is no longer used. USB Legacy Support can be left enabled in BIOS Setup if

needed.

Notes on using USB legacy support:

•

If USB legacy support is enabled, don't mix USB and PS/2* keyboards and mice. For example, do not

use a PS/2 keyboard with a USB mouse, or a USB keyboard and a PS/2 mouse.

Do not use USB devices with an operating system that does not support USB. USB legacy is not

intended to support the use of USB devices in a non USB operating system.

USB legacy support is for keyboards and mice only. Hubs and other USB devices are not supported.

12.

Addition of BIOS Beep Codes Section

The following will be added after Section 4.2. Remaining tables will be renumbered accordingly.

BIOS BEEP CODES

Whenever a recoverable error occurs during Power-On Self Test (POST), the BIOS displays an error

message describing the problem. The BIOS also issues a beep code (one long tone followed by two short

tones) during POST if the video configuration fails (no card installed or faulty) or if an external ROM module

does not properly checksum to zero.

An external ROM module (e.g video BIOS) can also issue audible errors, usually consisting of one long tone

followed by a series of short tones. For more information on the beep codes issued, check the

documentation for that external device.

AN430TX SPECIFICATION UPDATE

There are several POST routines that issue a POST Terminal Error and shut down the system if they fail.

Before shutting down the system, the terminal-error handler issues a beep code signifying the test point error,

writes the error to I/O port 80h, attempts to initialize the video and writes the error in the upper left corner of

the screen (using both mono and color adapters).

If POST completes normally, the BIOS issues one short beep before passing control to the operating system.

Table 43.

Beeps

1-2-2-3

1-3-1-1

1-3-1-3

1-3-3-1

1-3-3-2

1-3-3-3

1-3-4-1

1-3-4-3

1-4-1-1

2-1-2-2

2-1-2-3

2-2-3-1

2-2-4-1

1-2

BIOS Beep Codes

Port 80h Code

16h

Explanation

BIOS ROM checksum

20h

Test DRAM refresh

22h

Test 8742 Keyboard Controller

28h

Autosize DRAM

29h

Initialize POST Memory Manager

Clear 512 KB base RAM

2Ah

2Ch

RAM failure on address line xxxx

RAM failure on data bits xxxx of low byte of memory bus

RAM failure on data bits xxxx of high byte of memory bus

POST device initialization

2Eh

30h

45h

46h

Check ROM copy right notice

58h

Test for unexpected interrupts

5Ch

Test RAM between 512 and 640 KB

Search for option ROMs. One long, two short beeps on checksum failure

98h

13.

Revision of Section 3.1.4, PCI IDE Support

This section will be replaced in its entirety as follows:

If you select “Auto” in Setup, the BIOS automatically sets up the two local bus IDE connectors with

independent I/O channel support. The IDE interface supports hard drives up to PIO Mode 4 and recognizes

any ATAPI devices, including CD-ROM drives, tape drives and Ultra DMA drives (see Section 5.1 for the

supported version of ATAPI). Add-in ISA IDE controllers are not supported. The BIOS determines the

capabilities of each drive and configures them to optimize capacity and performance. To take advantage of

the high capacities typically available today, hard drives are automatically configured for Logical Block

Addressing (LBA) and to PIO Mode 3 or 4, depending on the capability of the drive. You can override the

auto-configuration options by specifying manual configuration in Setup. The ATAPI Specification

recommends that ATAPI devices be configured as shown in Table 41.

AN430TX SPECIFICATION UPDATE

14.

Revision of Video Memory Address

In Table 34, Memory Map, the address ranges for Video memory and BIOS will be changed to 640K-812K

(decimal) and A0000-CAFFF (hex). This will also change the ranges for Available High DOS memory to

812K-896K (decimal) and CB000-DFFFF (hex). The following note will be added applicable to Video Memory

and BIOS:

Note: Applies only to boards with onboard video. Video memory usage for other boards is determined by the

add-in video card.

15.

Change to Description of Manufacturing Options

The following will be added as the first paragraph of Section 1.2, Motherboard Manufacturing Options:

The following are manufacturing options. Not all manufacturing options are available in all marketing

channels. Please contact your Intel representative to determine what manufacturing options are available to

you.

16.

Addition of Section Describing Real Time Clock

The following will be added as Section 1.8.5. Following sections will be renumbered as necessary:

1.8.5 Real-Time Clock, CMOS SRAM, and Battery

The real-time clock is compatible with DS1287 and MC146818 components. The clock provides a time-of-

day clock and a multicentury calendar with alarm features and century rollover. The real-time clock supports

256 bytes of battery-backed CMOS SRAM in two banks that are reserved for BIOS use.

The time, date, and CMOS values can be specified in the Setup program. The CMOS values can be returned

to their defaults by using the Setup program.

An external coin-cell battery powers the real-time clock and CMOS memory. When the computer is not

plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in,

the 3.3 V standby current from the power supply extends the life of the battery. The clock is accurate to ± 13

minutes/year at 25 ºC with 3.3 V applied.

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