1+_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS: B28711      ]
 ] S. VENITSKY        ]    BFS PROGRAM NOTE         ] DR:  105347      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 05/24/94   ]
 ] RID / 922-1921     ]      RELEASE NOTE ( )       ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-22 & SUBS                  ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( ) BSS(X) GNC( ) SEQ( ) SM/SP( ) IPL( )]  0, 1, 3, 6             ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: DOWNLIST                                         ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG038101 / 3.7.1.2, 3.7.1.2.3                  ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]        NON-HOMOGENEOUS NATURE OF DOWNLIST                           ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] ANY SET OF DATA THAT IS DOWNLISTED IN MULTIPLE FRAMES IS SUBJECT TO ]
 ] BEING NON-HOMOGENEOUS IN ANY GIVEN DOWNLIST CYCLE.  THIS IS DUE TO  ]
 ] THE ASYNCHRONOUS NATURE OF THE BFS DOWNLIST.  DATA IS INSERTED INTO ]
 ] THE DOWNLIST BUFFER IN VARIOUS FIXED MINOR CYCLES, WHEREAS BFS      ]
 ] DOWNLIST REPEATS ITS SEQUENCE AT EXACTLY 1.000 SECOND INTERVALS.    ]
 ]                                                                     ]
 ] EXAMPLE:  IN DR 105347, BFS DOWNLIST INCLUDED COMPLETE MESSAGES     ]
 ] FROM BOTH PASS AND BFS CONTROLLED DEUS AS A FUNCTION OF THE BFS DK  ]
 ] LISTEN CAPABILITY.  THE DOWNLIST SHOWED A NON-HOMOGENEOUS SET OF    ]
 ] KEYBOARD DATA CONSISTING OF THE DEU HEADER WORDS FROM A PREVIOUS    ]
 ] BFS KEYBOARD ENTRY COMBINED WITH THE KEYSTROKE WORDS FROM A CURRENT ]
 ] PASS KEYBOARD ENTRY.                                                ]
 ]                                                                     ]
 ] THIS NON-HOMOGENEOUS DATA IS A RESULT OF THE BFS KEYBOARD PROCESSING]
 ] OCCURING IN FIXED MINOR CYCLES (3, 11, AND 19) OF A 0.960 SECOND    ]
 ] MAJOR CYCLE, BFS DOWNLIST REPEATING ITS SEQUENCE AT EXACTLY 1.000   ]
 ] SECOND INTERVALS, AND THE FACT THAT KEYBOARD DATA IS NOT DOWNLISTED ]
 ] ALL AT ONCE, BUT IS SPREAD OVER SEVERAL DOWNLIST FRAMES.  DUE TO    ]
 ] DIFFERENCE IN TIMING, IT IS POSSIBLE FOR THE KEYBOARD PROCESSOR TO  ]
 ] INSERT NEW DATA FROM A CURRENT KEYBOARD OPERATION IN THE BUFFER FOR ]
 ] DOWNLIST AFTER THE DOWNLISTING OF OLD KEYBOARD DATA HAS BEGUN.      ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] NONE.  WAIT UNTIL THE NEXT DOWNLIST CYCLE FOR THE DATA TO BE        ]
 ] HOMOGENEOUS.                                                        ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]RI: <S> G. ALBRIGHT       DATE 06/14/94]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 07/22/94]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 07/25/94 ]
 ]PF MGR:DEBRA I. ELDRIDGE  DATE 07/20/94]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
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