    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1638          12/10/96

    TITLE:  Bravo MS Video Conflict w/Stealth64 PCI

    ISSUE

       After installing the Diamond Stealth64 2001TV PCI video adapter
       into a Bravo MS/MS-T system, the video adapter may cause a
       conflict with the integrated ATI Mach64 video controller.

       The conflict occurs when the Diamond Stealth64 video adapter card
       attempts to use the same memory address as the System Board
       Extension for the Plug-and-Play (PnP) BIOS.

       During boot, with the Diamond Stealth64 installed, the following
       error message is displayed:

          "12.35  The computer encountered an error during the
           resource autoconfiguration process."

       Windows 95 continues to load, and eventually displays the
       following message:

          "Your display adapter conflicts with another device in
           your computer."

       The system then prompts the user to run the Hardware Conflict
       Troubleshooter. Examination of the Display Adapter section in
       Device Manager reveals both video adapters with yellow
       exclamation marks, representing the conflict.

       This issue affects the following systems: 501951, 501952, 501954,
       503088, 501955, 501956, 501972, and 503043.

    BACKGROUND

       Resources on the Stealth64 are allocated as follows:

       No conflict

       Memory Range      C0000-C7FFF
       Memory Range      A0000-AFFFF
       Memory Range      B0000-BFFFF
       I/O Range         3B0-3BB
       I/O Range         3C0-3DF
       IRQ               11
       Memory Range      F8000000-FBFFFFFF

       Conflict

       Memory Range      00000000-03FFFFFF used by System Board
                         Extension for PnP BIOS

    ACTION

       The conflict may be resolved by clearing non-volatile memory.
       From a command prompt, run the utility CLEARNVS.EXE (AST filename
       12493031.EXE), available from any AST On Line! services.

    NOTES

       N/A

    TAN TPR 400CK

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