 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] K. BENIKE          ]    PASS PROGRAM NOTE        ]     33304        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] VER/282-8451       ]      RELEASE NOTE( )        ] JULY 1987        ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 19 AND SUBS               ]  CREW ( )  GROUND (X)  DUMP ONLY (X)]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )] 0, G1, G2, G3, G6, G8, G9, S2,  ]
 ]                                   ] S4, PL9                         ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: BUS, DOWNLIST                                    ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: SBIO                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] RESETTING BTU PORT FAILURE INDICATORS                               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ] BTU PORT FAILURE INDICATORS ARE RESET (ZEROED) IN FOUR SITUATIONS.  ]
 ]                                                                     ]
 ] A. WHEN BUS MASKS ARE RESET FOR FC, PAYLOAD (PL), OR LDB BUSES      ]
 ]    (E.G., WHEN THE BUS IS REASSIGNED TO A GPC OR ITS RS), THE       ]
 ]    CORRESPONDING BTU PORT FAILURE INDICATORS ARE ALSO RESET.        ]
 ]    FOR MODABLE STRINGS (FC AND PL), ONLY THE BTU PORT FAILURE       ]
 ]    INDICATORS FOR THE CURRENT MODE ARE RESET.                       ]
 ]                                                                     ]
 ] B. THE BTU PORT FAILURE INDICATORS FOR AN FC OR PL STRING NEW       ]
 ]    MODE ARE RESET WHEN THE STRING IS MODED BETWEEN PRIMARY AND      ]
 ]    SECONDARY MODES (UNLESS BUS MASKS ARE SET FOR THE STRING).       ]
 ]                                                                     ]
 ] C. WHEN AN SOLID ROCKET BOOSTER (SRB) BUS IS SELECTED, THE BTU      ]
 ]    PORT FAILURE INDICATOR FOR THE SELECTED SRB BUS IS RESET         ]
 ]    (UNLESS A BUS MASK IS SET FOR THE BUS).                          ]
 ]                                                                     ]
 ] D. THE MANIPULATOR CONTROLLER INTERFACE UNIT (MCIU) PORT FAILURE    ]
 ]    INDICATOR IS CLEARED WHEN SM LOGIC CAUSES THE MCIU BCE ELEMENT   ]
 ]    TO BE RESTORED AFTER TWO MCIU ERRORS HAVE BEEN DETECTED.         ]
 ]                                                                     ]
 ] NOTE THAT THE STATUS OF THE BTU PORT FAILURE INDICATOR FOR A BUS    ]
 ] IS NOT MEANINGFUL IF A BUS MASK IS SET FOR THE BUS. THE BTU PORT    ]
 ] FAILURE INDICATOR WILL BE RESET WHEN THE BUS MASK FOR THE BUS IS    ]
 ] RESET.                                                              ]
 ]                                                                     ]
 ] IGNORE THE BTU PORT FAIL INDICATORS IN THE DOWNLIST IF THE          ]
 ] ASSOCIATED BUS IS DESELECTED.                                       ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 9/20/88 ]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 9/20/88 ]                             ]
 ]    --------------------      ---------] JACK G BOYKIN       9/22/88 ]
 ]PF MGR: GEORGE BULL       DATE 9/19/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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