    AST RESEARCH, INC.         TECHNICAL BULLETIN #0637                  10-04-90

                        AST COMPUTERS AND EVEREX TAPE DRIVES

    When installing an Everex EV-811 tape backup with a QIC-02 tape controller in
    an AST computer that uses an IDE interface controller, customers will
    experience random lockups at different times during tape back operations.

    Everex has confirmed that this problem is caused by a chip which is located
    on the QIC-02 tape controller at location U10.  A Signetics or Texas
    Instruments chip must be used for the tape unit to function properly with an
    IDE interface controller.

    Anyone experiencing this problem should contact Everex Product Support
    directly and refer to "ECO 4188".