 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] CHRISTY CARDA      ]    PASS PROGRAM NOTE        ]        101410    ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  05/12/87  ]
 ] LSIS/282-7506      ]      RELEASE NOTE( )        ] REV A: 09/29/95  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI-07 AND SUBS               ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )] 0, G1, G2, G3, G6, G8, G9, S2,  ]
 ]                                   ] S4, P9                          ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: I/O, FTS, MDM                                    ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: SS2                                            ]
 ]_____________________________________________________________________]
 ] TITLE: MDM HARDWARE FAILURE MAY CAUSE CONTINUOUS I/O ERRORS AND     ]
 ]        REDUNDANT SET FAIL TO SYNC                                   ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] AN MDM HARDWARE FAILURE MODE EXISTS WHICH CAN CAUSE CONTINUOUS      ]
 ] OUTPUT OF RESPONSE DATA WORDS IN RESPONSE TO A GPC READ COMMAND.    ]
 ] IF THIS FAILURE OCCURS, THE GPC BUS COMMANDER WILL LOG I/O ERRORS   ]
 ] WITH A BCE STAT REG=0000 0100, INDICATING MIA BUSY, ON BOTH INPUT   ]
 ] AND OUTPUT TRANSACTIONS.  IN A RS, LISTENER GPCS WOULD LOG MSC T/O  ]
 ] ERRORS ON THE INPUT TRANSACTIONS.  INPUT ERRORS WILL CAUSE BCE      ]
 ] ELEMENT AND/OR BTU SEGMENT BYPASSES.  THERE IS A VERY REMOTE POSSI- ]
 ] BILITY THESE ERRORS COULD CAUSE A NON-UNIVERSAL I/O ERROR RESULTING ]
 ] IN A FTS.                                                           ]
 ]                                                                     ]
 ] ERRORS ON OUTPUT TRANSACTIONS WILL CONTINUE AS LONG AS THE MDM/BTU  ]
 ] OUTPUTS UNSOLICITED DATA WORDS.                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] BE AWARE THAT THIS TYPE OF SOFTWARE SIGNATURE INDICATES THE PRESENCE]
 ] OF A SUSPECT MDM/BTU.                                               ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:  HUGH D. STOVALL    DATE 11/21/95]                             ]
 ]     -------------------      ---------]                             ]
 ]ASD:   ERIC C. BINGHAM    DATE 11/21/95]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 12/01/95 ]
 ]PF MGR: KAYLENE F. KINDT  DATE 11/30/95]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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