Intel 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.  
v
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.  
vi  
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  
A1  
A1  
A1  
A1  
A1  
A1  
A1  
A1  
A1  
A1  
4A3NT0X0.86A.0042.P02  
4A3NT0X0.86A.0047.P03  
4A3NT0X0.86A.0047.P03  
4A3NT0X0.86A.0047.P03  
4A3NT0X0.86A.0062.P06  
4A3NT0X0.86A.0062.P06  
4A3NT0X0.86A.0047.P03  
4A3NT0X0.86A.0047.P03  
4A3NT0X0.86A.0062.P06  
4A3NT0X0.86A.0062.P06  
1, 2, 3, 4, 5  
1, 2, 3, 4, 5  
1, 2, 3, 4, 5  
1, 2, 3, 4, 5  
1, 2, 3, 4, 5  
1, 2, 3, 4, 5  
1, 2, 3, 4, 5  
1, 2, 3, 4, 5  
1, 2, 3, 4, 5  
1, 2, 3, 4, 5  
NOTES:  
1.  
2.  
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  
A1  
S-Spec Numbers  
82439TX  
82371AB  
L238  
B0  
L23P  
3.  
4.  
5.  
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.  
3
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  
1
Doc  
NO. PLANS  
1
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*  
2
3
Fixed  
System BIOS does not recognize bootable USB devices  
4
NoFix Video corruption or no video on boot  
5
Fixed  
Fix  
Memory decrease warning message not displayed  
6
Hard drive not detected on boot if user defined  
7
Fixed  
Fixed  
Fixed  
Fix  
Intel® EtherExpress™ Pro/100B fails to initialize with Windows 95  
8
Potential battery drain if no AC power applied  
9
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  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
Fix  
Fixed  
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  
Fixed  
Fixed  
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  
4
AN430TX SPECIFICATION UPDATE  
NO. PLANS  
ERRATA  
20  
21  
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  
1
Doc  
Advanced Power Management (APM) will not function as expected with Universal Serial Bus  
(USB) enabled  
2
3
4
5
6
7
8
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
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  
1
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Doc  
Revision of Section 1.6.1, “Main Memory”  
Addition of “Power On” section  
2
3
Revision of Section 5.1, “Specifications”  
4
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”  
5
6
7
8
9
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  
10  
11  
12  
13  
14  
15  
16  
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  
5
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  
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-  
21  
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-  
21  
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  
1-3, 5-15, 17-18, 20-21  
1-2, 5-6, 8, 10-11, 14-15, 17-18, 20-  
21  
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  
1-3, 5-15, 17-18, 20-21  
1-2, 5-6, 8, 10-11, 14-15, 17-18, 20-  
21  
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  
6
AN430TX SPECIFICATION UPDATE  
PBA Revision  
BIOS Revision  
Errata That Apply  
1-3, 5-15, 17-18, 20-21  
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-  
21  
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-  
21  
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  
7
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.  
8
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.  
1.  
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  
33  
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.  
9
AN430TX SPECIFICATION UPDATE  
ERRATA  
1.  
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.  
2.  
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.  
3.  
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.  
4.  
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.  
10  
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.  
5.  
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.  
6.  
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.  
7.  
Intel® EtherExpressPro/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 EtherExpressPro/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.  
8.  
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.  
11  
AN430TX SPECIFICATION UPDATE  
WORKAROUND: None.  
STATUS: This erratum was fixed in PBA revision 669379-306.  
9.  
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.  
12  
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.  
13  
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.  
14  
AN430TX SPECIFICATION UPDATE  
21  
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.  
15  
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.  
1.  
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.  
2.  
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.  
3.  
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)  
4.  
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.  
16  
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.  
5.  
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.  
6.  
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.  
7.  
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.  
8.  
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.  
17  
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.  
1.  
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  
60 ns EDO  
60 ns EDO  
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  
16 Mbit  
16 Mbit  
16 Mbit  
16 Mbit  
16 Mbit  
64 Mbit  
64 Mbit  
CAS Latency 2 SDRAM  
CAS Latency 2 SDRAM  
CAS Latency 2 SDRAM  
CAS Latency 2 SDRAM  
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  
18  
AN430TX SPECIFICATION UPDATE  
2.  
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.  
3.  
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.  
4.  
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  
5.  
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.  
6.  
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.  
19  
AN430TX SPECIFICATION UPDATE  
7.  
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.  
8.  
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.  
9.  
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)  
20  
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.  
21  
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.  
22  
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.  
23  
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