 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] K. BENIKE          ]    PASS PROGRAM NOTE        ]     45609 *      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] VER/282-8451       ]      RELEASE NOTE( )        ] REV A: 06/14/89  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI02 AND SUBS                 ]  CREW (X)  GROUND ( )  DUMP ONLY (X)]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )] G1, G6, PL9                     ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: DISP                                             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: STIM                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] CRT TIMER DECREMENTS DURING LAUNCH HOLDS                            ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:     * REFERENCE DR 47317                               ]
 ]                                                                     ]
 ] THE ONBOARD CRT TIMER IS CORRECT TO PLUS OR MINUS 1 SECOND DURING A ]
 ] LAUNCH HOLD OR LAUNCH ABORT. DUE TO CURRENT TIME AND LIFTOFF TIME   ]
 ] BEING UPDATED BY DIFFERENT PRIORITY PROCESSES (I.E., SIP AND HFE),  ]
 ] THE COMPUTED DELTA TIME MAY VARY BY 40 MSEC FROM ONE COMPUTATION    ]
 ] CYCLE TO THE NEXT DURING A LAUNCH HOLD. DUE TO ROUNDOFF, THIS CAN   ]
 ] APPEAR AS A 1 SECOND CHANGE IN DISPLAYED VALUE.                     ]
 ]                                                                     ]
 ] A. THE TIMER DISPLAYED MAY OSCILLATE APPROXIMATELY TWICE PER SECOND,]
 ]    E.G., 7:00 - 6:59 - 7:00 - 6:59                                  ]
 ]                                                                     ]
 ] B. THE TIMER MAY DECREMENT OR INCREMENT BY ONE SECOND, E.G.,        ]
 ]    7:00 - 7:00 - 6:59 - 6:59 - 6:59                                 ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] NOTE: THE DISPLAYED ONBOARD TIMER IS ACCURATE TO PLUS OR MINUS 1    ]
 ]       SECOND DURING LAUNCH HOLDS OR ABORTS. THIS ANOMALY AFFECTS    ]
 ]       THE DISPLAYED TIME ONLY.                                      ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 07/13/89]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 07/14/89]                             ]
 ]    --------------------      ---------] M.C. GREMILLION    08/20/89 ]
 ]PF MGR: E.A. FOUNTAIN     DATE 07/14/89]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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