 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] M. SOMERS          ]    PASS PROGRAM NOTE        ]      103002      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  09/09/88  ]
 ] IBM/282-7324       ]      RELEASE NOTE( )        ] REV A: 01/03/91  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]   OI7D AND SUBS               ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )] G1, G9                          ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:   CYCLE-WRAP                                     ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  SBIO                                          ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]         SRB I/O CYCLE WRAP GPC ERRORS                               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]      AN SRB PRE-INITIALIZED IOQE BUSY (I/O CYCLE WRAP) GPC ERROR    ]
 ]      (GROUP 7 CODE 6) MAY OCCUR DUE TO I/O ERROR PROCESSING ON      ]
 ]      FLIGHT CRITICAL OR LAUNCH DATA BUSES.  THIS FREQUENTLY OCCURS  ]
 ]      AT T-20 MIN. POINT IN THE LAUNCH COUNTDOWN PROFILE, WHERE THE  ]
 ]      G1 (ASCENT) OPS TRANSITION TAKES PLACE.  IT IS A RESULT OF     ]
 ]      I/O ERROR PROCESSING REQUIRED TO HANDLE THE 3 BUS I/O ERROR    ]
 ]      ENCOUNTERED DUE TO THE MSBLS'S BEING POWERED OFF AT THAT TIME. ]
 ]                                                                     ]
 ]      THIS GPC ERROR MAY ALSO OCCUR DURING PERIODS OF HIGH CPU       ]
 ]      ACTIVITY, E.G. AT SRB IGNITION, AT A LAUNCH HOLD OR ABORT,     ]
 ]      ETC., AS A RESULT OF EXTRA FC I/O REQUESTS WHICH ARE HIGHER    ]
 ]      PRIORITY.                                                      ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]                                                                     ]
 ]      THIS ERROR IS AN INDICATION THAT THE SRB DATA ACQUISITION      ]
 ]      FOR THAT CYCLE WILL BE SKIPPED.  THE ONLY USE OF THIS DATA     ]
 ]      IS FOR DOWNLIST, AND FOR THE CYCLE ON WHICH THE SRB DATA       ]
 ]      IS NOT READ, THE SRB DATA THAT IS DOWNLISTED WILL BE STALE,    ]
 ]      I.E. THE SAME AS THE PREVIOUS CYCLE.                           ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 02/05/91]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 02/07/91]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 02/08/91 ]
 ]PF MGR:ELIZABETH FOUNTAIN DATE 02/05/91]------------------- -------- ]
 ]       ------------------     ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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