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