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    AST RESEARCH, INC.       TECHNICAL BULLETIN # 1098                  3-10-95

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    	    PROBLEMS WITH DPT 2122 CONTROLLERS AND BANYAN VINES

    PROBLEM

    Extremely slow performance has been reported using DPT 2122 controllers under
    Banyan Vines version 5.54, in an AST Manhattan V 5090 system.  System crashes
    occurred after changing DPT firmware from version 5E to version 6B.

    CAUSE

    DPT firmware 5E, and 6B have problems running under Banyan Vines version 5.54.

    SYSTEMS AFFECTED
    AST PART NUMBER AND DESCRIPTION

    501500-XXX     MANHATTAN V 5090
    501502-XXX     MANHATTAN P 5090

    SOLUTION

    DPT firmware version 7A2 resolves all known problems with the 2122 controllers
    under Vines 5.54. To obtain this firmware call Distributed Processing Technology
    at (407) 830-5522 and ask for Firmware version 7A2 for the 2122 controller.