    AST RESEARCH, INC.         TECHNICAL BULLETIN #0613A                 04-19-90

                        FASTBOARD 486/25 UPGRADE REQUIREMENTS

    When upgrading any AST "CUPID" series Premium computer with a  FASTboard
    486/25 Upgrade Kit, it is necessary to verify that the correct kit is used
    and that the system's components meet the requirements listed below.

    1.  UPGRADE KITS

        Follow the table below to identify which FASTboard 486/25 Upgrade Kit is
        required to upgrade your machine.

        +--------------------------------------------------------+
        |PRODUCT                 KIT REQUIRED         PART NUMBER|
        |--------------------------------------------------------|
        |Premium 386SX/16   FASTboard 386SX-486/25    500744-006 |
        |--------------------------------------------------------|
        |Premium 386/25     FASTboard 386-25/486-25   500744-002 |
        |--------------------------------------------------------|
        |Premium 386/33     FASTboard 386-33/486-25   500744-003 |
        +--------------------------------------------------------+

    2.  SYSTEM BOARD

        Locate the part number on the front of the system board below the slot
        connectors.  You can install the FASTboard 486/25 if the system board
        matches the part numbers shown in the following table:

                       +-------------------------------------+
                       | PRODUCT   PART NUMBER   REVISION    |
                       |-------------------------------------|
                       | 386SX/16  202273-003    F or above  |
                       |           202356-001    F or above  |
                       |           202356-004    D or above  |
                       |-------------------------------------|
                       | 386/25    202273-001    N or above  |
                       |           202356-002    D or above  |
                       |           202356-004    D or above  |
                       |-------------------------------------|
                       | 386/33    202273-002    J or above  |
                       |           202356-003    D or above  |
                       |           202356-004    D or above  |
                       +-------------------------------------+

    3.  MEMORY EXPANSION BOARD

        Locate the part number on the front of the memory expansion board.  You
        can install the FASTboard 486/25 if the memory expansion board matches
        the part numbers shown in the following table:

                       +-------------------------------------+
                       | PRODUCT    PART NUMBER   REVISION   |
                       |-------------------------------------|
                       | ALL        202275-004    A or above |
                       |            202275-006    A or above |
                       +-------------------------------------+

    If your system does not contain the necessary components, contact your
    nearest AST Authorized Reseller or Service Center.