 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] K. BENIKE          ]    PASS PROGRAM NOTE        ]     29284    *   ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] VER/282-8451       ]      RELEASE NOTE( )        ] JULY 1987        ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 18 AND SUBS               ]  CREW (X)  GROUND (X)  DUMP ONLY (X)]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )] 0, G2, G8, G9, S2, S4, PL9      ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: SPEC, KEYBOARD, FTS                              ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: STIM                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] SPEC 002, GMT UPDATES                                               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:  * 40620                                               ]
 ]                                                                     ]
 ] WHEN A GREENWICH MEAN TIME (GMT) UPDATE IS EXECUTED (ITEM 32 EXE-   ]
 ] CUTE, SPEC 002), THERE IS AN INTERVAL OF UP TO 2 MINUTES UNTIL THE  ]
 ] UPDATE WILL TAKE EFFECT. THIS IS A FUNCTION OF THE MASTER TIMING    ]
 ] UNIT (MTU) HARDWARE, WHICH CAN BE UPDATED ONLY AT A WHOLE MINUTE.   ]
 ] DURING THE INTERVAL, WHILE WAITING FOR THE UPDATE TO TAKE EFFECT,   ]
 ] SOME USER ACTIONS SUCH AS KEYBOARD INPUTS MAY CAUSE UNEXPECTED RE-  ]
 ] SULTS (E.G., A FAIL-TO-SYNC).                                       ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] GMT UPDATES > 15 MSEC:                                              ]
 ]    NO USER ACTIONS OR KEYBOARD INPUTS SHOULD BE ATTEMPTED UNTIL THE ]
 ]    UPDATE TAKES EFFECT. THIS TYPE OF UPDATE WILL FORCE REINITIALI-  ]
 ]    ZATION.                                                          ]
 ]                                                                     ]
 ] GMT UPDATES < OR = TO 15 MSEC:                                      ]
 ]    THE FOLLOWING ACTIONS ARE NOT ALLOWED UNTIL THIS UPDATE TAKES    ]
 ]    EFFECT;                                                          ]
 ]                                                                     ]
 ]    + ADDITIONS OF A GPC TO THE CS.                                  ]
 ]    + OPS TRANSITION REQUESTS OR MODE RECALL.                        ]
 ]    + I/O RESETS.                                                    ]
 ]    + I/O TERMINATE SWITCH CHANGES.                                  ]
 ]    + ACCUMULATOR SELECT.                                            ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 08/04/88]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 08/10/88]                             ]
 ]    --------------------      ---------] JACK BOYKIN         08/17/88]
 ]PF MGR: MICHAEL BRIEDEN   DATE 08/08/88]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
 @



 DR29949
