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    AST RESEARCH, INC.         TECHNICAL BULLETIN # 1227               6-20-95

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    POWEREXEC AND DIAMOND STEALTH/STB 64 BIT VIDEO ADAPTERS

    PROBLEM

    The Diamond Stealth 64 Bit ISA graphics accelerator and the STB Systems
    Nitro 64 Bit ISA 2MB video adapters do not function when installed in the
    PowerStation I with the PowerExec connected.  No video appears on the
    external VGA monitor connected to the video adapter card.  Simultaneous
    video or external video does not work.

    CAUSE

    The PowerExec is not compatible with the Diamond Stealth and STB 64 Bit
    VGA adapters.  These types of adapters were designed after the PowerExec
    was released.

    SYSTEMS AFFECTED
    AST PART NUMBER AND DESCRIPTION

    501114-XXX      PWRE 386SL25/3/4 US C+/8
    501115-XXX      PWRE 486SL25/3/4 US C+/9
    501165-XXX      PWRE 386SL25/3/4 US C+/9
    501192-XXX      PWRE 486SL33/3/4 US C+/9
    501138-XXX      PWRE 486SL25 MONO

    SOLUTION

    There is no solution available to have the PowerExec work with these 64 Bit
    VGA adapters.  A possible work around is to use a 32 or 16 Bit VGA adapter.