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    AST RESEARCH, INC.         TECHNICAL BULLETIN # 1004                  10-26-94

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                             MPC MANHATTAN RESETTABLE FUSE

    PROBLEM:        During the installation of the Manhattan SMP system, the fuse
                    at location J4 may not reset.  As a result, the fuse may fail
                    causing the Mylex controller to malfunction.

    CAUSE:          Non-resettable fuse.

    SYSTEMS
    AFFECTED:           AST
                    PART NUMBER             DESCRIPTION

                    520081-XXX      MP BASE UNIT SINGLE P/S 115V CNFG
                    520163-XXX      MP BASE UNIT P54C HIGH MEM CNFG 16MB
                    590001-001      SPARE KIT SMP
                    FDPS172         BASE UNIT SMP4-50
                    FDPS172K1       BASE UNIT SMP4-50
                    FDPS173         BASE UNIT SMP4-50
                    FDPS173KZ       BASE UNIT SMP4-50
                    FDPS175K4       BASE UNIT SMP P/5
                    FDP175K5        BASE UNIT SMP P/5
                    FDPS177K6       BASE UNIT SMP P/5
                    FDPS178K7       BASE UNIT SMP P/5
                    FDPS179K8       BASE UNIT SMP 4-50
                    FDPS180KO       BASE UNIT SMP 4-50
                    FDPS181K1       BASE UNIT SMP 4-50
                    FDPS187K7       BASE UNIT SMP P/5
                    FDPS192K3       BASE UNIT SMP P/5
                    FDPS193K4       BASE UNIT SMP P/5
                    FDPS194K5       BASE UNIT SMP P/5
                    FDPS195K6       BASE UNIT SMP P/5
                    FEAS129         BASE UNIT XP 115V INTR
                    FEAS12917       BASE UNIT XP 115V INTR (CNFG)
                    FEAS129F2       BASE UNIT XP 115V INTR (OPT)

    SOLUTION:       This is an informational bulletin.  The Mylex adapter boards
                    (part numbers 202523-001, revision 05 or higher, and
                    202523-003, revision 03 or higher) have a resettable fuse.
                    If the resettable fuse is triggered, it is reset by powering
                    the system off and on.