    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1503           6-6-96

    TITLE: IBM 3278/3279 Emulation PCB, Bravo MSP75

    SUMMARY

       An emulation session may abort intermittently when using an
       IBM 3278/3279 emulation board in a Bravo MS P75 system.

       This issue applies to the following system:  501772.

    ISSUE

       The emulation session aborts because the "RESETDRV" signal generated
       by the computer is too short.  The system displays the following
       error message when this condition occurs:

         "Could not establish session connection.  Please check
         the configuration for this session or contact your Systems
         Administrator".

       The Error Message log contains the following error description:

              The coax adapter is not installed.
              No connection on Coax DFT=0X1.
              Could not open session.

    BACKGROUND

       N/A

    ACTION

       Replace the riser card, AST part number 202755-001.

       The riser card needs to be at revision level C or higher to
       correct the error condition.

    NOTES

       The error condition exists regardless of the operating system that
       is used.  Also, the diagnostics that IBM provides for the emulation
       adapter intermittently fail to execute.

    TAN 002400PS

    ---------------------------------------------------------------------
    The information in this data sheet is subject to change without
    notice. AST Research, Inc. shall not be liable for technical or
    editorial errors or omissions contained herein; nor for incidental or
    consequential damages resulting from the furnishing, performance,
    or use of this material. This material contains information protected
    by copyright. No part of this material may be reproduced in any form
    without prior written consent from AST Research, Inc.
    All rights reserved.
    ---------------------------------------------------------------------