    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1658          01/28/97

    TITLE:  Ascentia 950N, P NT 4.0 Video Drivers

    ISSUE

       Under Windows NT 4.0, an Ascentia 950N or an Ascentia P may
       exhibit corruption on the LCD display panel. This issue will
       usually occur on systems with DSTN (Passive Matrix) LCD display
       panels.

       This issue affects the following systems:

       501707, 501708, 501741, 501742, 501743, 501744, 501897, 501898,
       501905, 501996, 501997, 503039, and 503041.

    BACKGROUND

       The Ascentia 950N and early Ascentia P systems use the Cirrus
       7543 video controller. Later production Ascentia P systems use
       the Cirrus 7548 video controller.

    ACTION

       Download the Windows NT 4.0 video drivers from the Cirrus Logic
       BBS at 510-440-9080 and update your system's video drivers.

       Before downloading a new video driver, determine the video
       controller in your system.

       The following units have the 7543 controller: 501707, 501708,
       501897, 501898, 501741, 501742, 501743, 501744, 501905, 501996,
       501997. For these systems download version 2.40a or higher.

       The following units have the 7548 controller: 503039 and 503041.
       For these systems download version 1.40 or higher.

       For systems with the 7543 controller, download filename
       K7543nt4.ZIP.

       For systems with the 7548 controller, download filename
       K7548D7.ZIP.

    NOTES

       N/A

    TAN 000956JB

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