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BIOS DOWNLOAD PAGE

Available BIOS updates for this motherboard:

(If there is more than one BIOS update to this motherboard, the newer version will contain all of the changes from previous versions. The newer version is also listed first. Some BIOS updates are sensitive to the motherboard revision you have. Please read the BIOS Update Comments for details.)

Please use the appropriate BIOS with your mainboard. The BIOS files below are made specifically for the P2B mainboard (no extension after P2B), not the other P2B series of mainboards (-L/LS/-S/-D/-DS).

    Update comments:
    • 1. DMI revised for maximal supported memory size entry.
    • 2. Fix HCT throttling test error.
    • 3. Fix for the system can't boot from some models of LS-120.
    • 4. Fixed system hang upon resume from Win95 Suspend on some special configuration like both 3COM LAN & Adaptec SCSI are installed.
    • 5. Fix for hard disk failed in diagnosis if the type is USER.
    • 6. Fix for Suspend support error: Got out of Suspend unexpectedly.
    • 7. Fix for AGOGO-XP & ATI Rage Pro failed to boot Win98 boot diskette.
    Update comments:
    • Fixed WinFast 3D S800 failed to boot if any key is pressed before VGA ROM initialization is complete.
    • Fixed for power button got no function with the following transition: Win98 (ACPI on) -> Restart to MS-DOS.
    • Opened IRQ 3 & IRQ 4 to be selected for PCI devices.
    • Fixed Win98 HCT APM 1.2 test failure: Device PM test failure.
    • Added ZIP Floppy Mode option.
    • Fixed for screen was messed up after being scrolled up.
    • Fixed QAPLUS/Norton Utility Disk-Change test failure.
    • Fixed HCT test error.
    • Added Katmai support.
    • Upgraded microcode update data to revision 014 for PII dB0 stepping. (PII 400MHz & PII 450MHz)
    • Show 'Intel(R) Celeron(TM)' for Mendocino. Show 300A MHz for Mendocino 300, show xxx MHz for others.
    • Fix for keyboard wakeup failed sometimes.
    • Show 'INTEL(R) CELERON(TM)' for Intel Celeron. Show 'PENTIUM II' for Intel Mendocino. Reconstruct system configration table for longer CPU string display.
    • Fixed HCT unreported I/O error.
    • Fixed HCT unreported memory error.
    • Speed up IDE auto detection.
    • Supoort IOMEGA Partition Hiding.
    • Show MO/Tape instead of CDROM for ATAPI MO/Tape devices.
    • Added 'VGA BIOS Sequence' item. (PCI/AGP or AGP/PCI)
    • Added ACPI RI#/PME# support.
    • Disable Ring Wakeup under Win95/Win98 (APM mode) if it's Setup disabled.
    • Support flash utility with USB keyboard.
    • Remove 'No Function' option for 'Power-Button' item.
    • Fix for fan being turned off unexpectedly when shift-restart in Win98.
    • Turned off fan when entering suspend state under ACPI OS.
    • Fixed HCT failure: PCI IRQ holders should not be visible to users.
    • Support 64MBit/2-Bank SDRAM.
    • Fix AMD AM79C970AKC LAN Card ROM initialization problem.
    • Fix hard disk fails if the color of the setup screen is not default.
    • Support Win98 USB device wakeup.
    • Fix LS120/1.44M diskete failed to boot.
    • Fix Wake-On-LAN support failed with Intel's SPD3.EXE program test.
    • Support S.M.A.R.T. feature.
    • Fix the system can't boot from Iomega Z100ATAPI ZIP with a bootable ZIP disk formatted by Iomega Tools for Windows 95.
    • Add Creative SB-Link support.
    • Fix Intel/558 LAN card failed under Win95 after exiting from Suspend mode.
    • Show Tape instead of CDROM for ATAPI tape device.
    • Support Boot from LAN.
    • Dynamically update LM78/LM75 values monitored in Setup.
    • Fix 3COM 3C905B WOL card failed with D3-cold support.
    Update comments:
    • First Release


When to flash the BIOS

    A BIOS upgrade will usually contain one or more of the following: additional BIOS features, fixes for various bugs and/or compatibility problems, and additional CPU support. The newest BIOS upgrade will always contain the fixes from earlier revisions (so you do not need to flash every BIOS revision between your current revision and the latest revision). However, if your system is working without problems or conflicts, then it isn't recommended that you flash your BIOS. If it ain't broke, don't fix it! Trying to fix a working system might result in a non-working one.

    How to determine your BIOS revision

    Boot the system. During the memory count, look for the line: #401A0-XXXX. It should be the third line from the top of the screen. The XXXX (the last four numbers in the sequence after the dash) are your BIOS revision. For example: #401A0-0202 would mean that you have BIOS revision 0202.

Instructions
    To flash the BIOS, you will need the utility aflash.zip (In zipped format). Download this as well as the BIOS update above, and then follow the instructions below: New Features of AFLASH:
    1. Support 1M or 2M Bytes Flash EPROM.
    2. Support ACPI Function.
    3. Compare "BIOS Version", "Chipset and Model" and "Date of BIOS Built" between the current and updated BIOS. If any of above items doesn't match , it will give you the warning message.

    Upon first use of the computer system:

    1. Create a bootable system floppy diskette by typing [FORMAT A:/S] from the DOS prompt without creating "AUTOEXEC.BAT" and "CONFIG.SYS" files.

    2. Copy AFLASH.EXE to your new diskette.

    3. Run AFLASH.EXE from your new diskette and select option 1 "Save Current BIOS To File."
    Please Enter File Name to Save:(Current File).

    Updating BIOS procedures (only when necessary):

    IMPORTANT: Flash Memory Type maybe "AMD Am29F002NT". If "UNKNOWN" is displayed after "Flash Memory:" then this ROM chip is not programmable or not supported with the PnP BIOS and therefore cannot be programmed by the Flash Memory Writer.
    AFLASH will check the file and flash type whether parameter block matches or not 8K4K4K(e.g. SST 29EE020 or Winbond W290020) and 16K8K8K(e.g. Atmel AT49F002T, SGS-THOMSON M29F002T or AMD Am29F002NT).

    1. Download an updated ASUS BIOS file from the internet (WWW), FTP, or a BBS (Bulletin Board Service) and save to the diskette you created above. See ASUS CONTACT INFORMATION on Page II of the User's Manual for more details.

    2. Boot from the floppy diskette you created above.

    3. At the "A:\" prompt, type: [AFLASH] and then the key.

    4. Enter 2 "Update BIOS Including Boot Block and ESCD" from the Main Menu.

    5. The program displays a second screen prompting you for the name of the BIOS file. Type in the complete file name and extension of the new BIOS, and then press the key. The utility then uploads the BIOS file from disk.

    WARNING: If you encounter problems while downloading 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, upload the original BIOS file you saved to disk above. If the Flash Memory Writer utility was not able to successfully download a complete BIOS file, your system may not be able to boot up. If this happens, your system will need service from your vendor.

    6. After successfully downloading the new BIOS file, exit the Flash Memory Writer utility and then turn off your system.

    7. Turn on your computer and hold down the key to enter BIOS setup. You must select "Setup Default" to affect the new BIOS, then you may set other items from the Main Menu.
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