    AST RESEARCH, INC.           TECHNICAL BULLETIN # 1319        10-11-95

                   ADAPTEC AHA2940 AND MANHATTAN P/V SERIES SERVERS

    PROBLEM:     When installing an Adaptec AHA2940 PCI SCSI controller in
                 the Manhattan P/V series of servers, the system will hang
                 and generate the following error message:

                    PCI error 83090020, 830B0000

                 The problem only occurs when the embedded NCR SCSI
                 controller is enabled and active (i.e. drives are attached
                 to both controllers).

    CAUSE:       A PCI resource allocation conflict exists between the
                 Adaptec 2940 card and the embedded NCR SCSI controller.

    SOLUTION:    Update the Adaptec 2940's BIOS to version 1.16/checksum
                 6E00 or current revision.

                 In order to have the firmware updated, the customer can
                 call Adaptec support (408-934-7274) and identify the issue
                 to them.  Adaptec will verify the failure and if true,
                 ship the customer an updated BIOS PROM.  The replacement
                 procedure should be completed in compliance with proper
                 electrostatic protocol. (i.e. Board and PROM should not be
                 handled without proper grounding).

    SYSTEMS
    AFFECTED:    All Manhattan P/V series servers

                 AST PART NUMBER DESCRIPTION

                 501500-XXX      Manhattan V Series  P5090
                 501502-XXX      Manhattan P Series  P5090
                 501503-XXX      Manhattan V Series  P5100
                 501830-XXX      Manhattan V Series  P5133