    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1557          08/30/96

    TITLE:  Video Refresh AST 20H Monitor, Bravo

    SUMMARY

       The AST 20H monitor screen may experience gray shading over the
       entire screen when connected to a Bravo MS-T P200 system.
       This issue affects any system that uses the ATI Mach 64 chip with
       the specific monitor mentioned above.

    ISSUE

       A Bravo MS-T P200 system, AST part number 503058-003, connected
       to an AST 20H monitor, AST part number 501328-002, may experience
       incorrect video. The problem may be most evident when a screen is
       displayed with a white background. Gray shading may be seen over
       the entire screen instead of the normal white background expected.

    BACKGROUND

       When a Bravo MS-T P200 uses the ATI video driver at a resolution
       of 640 X 480, the refresh rate is set by default to 120Hz .
       The timing specification of the AST 20H has a maximum recommended
       refresh rate of 72 Hz at this resolution.

    ACTION

       1. Open the Control Panel in Windows 95 and double-click
          on the Display icon.

       2. Select the Adjustment tab.

       3. Click on Change Refresh Rate and set the refresh rate
          from 120 Hz to 70 Hz and click on Change.

       4. Select OK and answer OK to Save Settings.

    NOTES

       N/A

    TAN 000951CH

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