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    AST RESEARCH, INC.          TECHNICAL BULLETIN # 1198               5-31-95

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    BRAVO MT HANGS RUNNING 800x600x16M IN WINDOWS NT 3.5

    PROBLEM

    After selecting the video mode from 'Display' in the 'Control Panel' menu,
    the Bravo MT system (with a 2MB video memory) hangs when trying to run
    the Windows NT 3.5 Workstation in 800x600x16.8 million color graphics mode.

    The system also hangs at the 800x600x16.8 million color video mode in
    Windows NT 3.1 server systems.

    In Windows 3.1 (ATI Mach 32 driver Ver. 1.02 ), the system can not select
    the 800x600x16.8 million color mode from the ATI driver.

    CAUSE

    The RAMDEC for the integrated ATI Mach 32 video chip on the Bravo MT system
    does not support the graphic type of 800x600x16.8 million color mode.

    SYSTEMS AFFECTED
    AST PART NUMBER AND DESCRIPTION

    501278-XXX      BRAVO MT 4/33
    501279-XXX      BRAVO MT 4/66D
    501447-XXX      BRAVO MT 4/33S
    501459-XXX      BRAVO MT 4/50S

    SOLUTION

    The Bravo MT system does support the 800x600x16.8 million color graphic
    mode.  However, the system does support 640x480x16.8 million colors,
    1280x1040x256 colors, and other standard video modes.