    AST RESEARCH, INC.         TECHNICAL BULLETIN # 0923A                6-28-94

                   QUANTUM HARD DRIVE DEFAULT JUMPER SETTINGS ERROR

    PROBLEM:        Quantum hard drive is not recognized due to incorrect
                    termination settings.  This may apply to various systems
                    including the Premium SE.

    CAUSE:          Terminator jumper settings were incorrectly set by the
                    manufacturer.

    SYSTEMS             AST                                              REVISION
    AFFECTED:       PART NUMBER          DESCRIPTION                       LEVEL
                    500128-003      HDISK 1.0 GB FSCSI LC CFG               All
                    500872-007      HDISK 1.0 GB FSCSI 3.5 PRM MTE          All
                    500887-XXX      PREMIUM SE 486DX/33                     All
                    500888-XXX      PREMIUM SE 486DX/50                     All
                    500998-XXX      PREMIUM SE 486DX-2/50                   All
                    500999-XXX      PREMIUM SE 486DX-2/66                   All
                    501200-007      PRM SE 4-33/1003 8MB 115V               All
                    501200-008      PRM SE 4-33/1003 8MB 230V               All
                    501202-007      PRM SE 4-66D/1003 8MB 115V              All
                    501202-008      PRM SE 4-66D/1003 8MB 230V              All
                    501203-003      PRM SE P60/2003D 16MB CD 115V           All
                    501203-004      PRM SE P60/2003D 16MB CD 230V           All
                    520076-003      HDISK 1.0 GB FSCSI W/MTG TRAY CNFG      All
                    520076-006      HDISK 1.0 GB FSCSI W/MTG TRAY XPCNFG    All
                    520123-000      MASTER CNFG PRM4-4-33S                  All
                    520124-000      MASTER CFG PRM4-33                      All
                    520125-000      MASTER CFG PRM4-66D                     All

    SOLUTION:       Change the factory default jumper settings.

                    WAS:    Jumper EP is ON and TE, WS, A1, A2, A3 are OFF
                                ON Termination Disable
                            TE  OFF Termination Enable

                    IS:     Jumpers EP, WS are ON and TE, A1, A2, A3 are OFF
                            TE  ON Termination Enable
                                OFF Termination Disable