 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS: D019A       ]
 ] P. WILSON          ]    BFS PROGRAM NOTE         ] DR:              ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE : 06/04/86  ]
 ] RI/KSC/1-4656      ]      RELEASE NOTE ( )       ] REV A: 06/10/92  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] ALL                           ]CREW (X) GROUND (X) DUMP ONLY ( )    ]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( )BSS( )GNC( )SEQ( )SMSP( )IPL( )DCP(X)] ALL                     ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: DCP (VERSION 8.07)                               ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG017300                                       ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]        POSSIBLE ERRORS ON TERMINATOR KEYS                           ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] DURING DCP PROCESSING OF TERMINATOR KEYS (I.E. 'EXEC', 'PRO',       ]
 ] 'FAULT SUMM','SYS SUMM' AND 'RESUME'), IT IS POSSIBLE FOR ANY OF    ]
 ] THE FOLLOWING ANOMALIES TO OCCUR:                                   ]
 ]                                                                     ]
 ]   A) AN 'ILLEGAL ENTRY' MESSAGE ON A PASS CRT OR AN 'I/O ERROR      ]
 ]      CRTX' ON A BFS CRT, WHERE X IS THE CRT NUMBER;                 ]
 ]                                                                     ]
 ]   B) NO INDICATION OF A RESPONSE FROM THE GPC;                      ]
 ]                                                                     ]
 ]   C) A 'POLL FAIL' MESSAGE DISPLAYED ON THE CRT;                    ]
 ]                                                                     ]
 ] SEE SUPPLEMENTAL SHEET.                                             ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] THERE IS A DIFFERENT RESPONSE, DEPENDING UPON WHICH ANOMALY OCCURS: ]
 ]                                                                     ]
 ]   FOR A) ABOVE, PRESS 'MSG RESET', THEN RE-ENTER THE KEYBOARD       ]
 ]       COMMAND;                                                      ]
 ]                                                                     ]
 ]   FOR B) ABOVE, RE-ENTER THE KEYBOARD COMMAND IF THERE IS NO        ]
 ]       RESPONSE FROM THE GPC WITHIN A NOMINAL EXPECTED TIME;         ]
 ]                                                                     ]
 ] SEE SUPPLEMENTAL SHEET.                                             ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]RI: <S> J. AGRES          DATE 07/06/92]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD: ROBERT N. HINSON    DATE 07/20/92]                             ]
 ]    --------------------      ---------] DARRELL E. STAMPER 07/21/92 ]
 ]PF MGR:  D. STEPHENSON    DATE 07/20/92]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
 @





 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] SMS: D019A       ]
 ] P. WILSON          ]    BFS PROGRAM NOTE         ] DR:              ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE : 06/04/86  ]
 ] RI/KSC/1-4656      ]      RELEASE NOTE ( )       ] REV A: 06/10/92  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ]        POSSIBLE ERRORS ON TERMINATOR KEYS                           ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]   D) A 'ZERO MESSAGE LENGTH IN DEU RESP BUFF' PASS GPC ERROR        ]
 ]      (GROUP 06, CODE 01).                                           ]
 ]                                                                     ]
 ] THIS IS DUE TO THE EXISTENCE OF TWO DCP TIMING WINDOWS (14.5 AND    ]
 ] 45 MICROSECONDS) WHICH, IF INTERRUPTED BY A POLL REQUEST FROM THE   ]
 ] GPC, CAN CAUSE THE DCP TO TRANSFER ERRONEOUS KEYBOARD DATA TO THE   ]
 ] GPC.                                                                ]
 ]                                                                     ]
 ] IT SHOULD BE NOTED THAT THE DISPLAY OF KEYSTROKES ON THE CRT        ]
 ] SCRATCH PAD LINE IS UNAFFECTED BY THESE TIMING WINDOWS AND WILL     ]
 ] APPEAR NORMAL.                                                      ]
 ]                                                                     ]
 ] FOR A) ABOVE, BFS MAY ANNUNCIATE THE ERROR FOR ANY CRT THROUGH      ]
 ] THE DK LISTEN CAPABILITY.  THE ANNUNCIATION WILL BE A FAULT         ]
 ] SUMMARY MESSAGE WITH NO ASSOCIATED I/O ERROR LOG ENTRY.             ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ]   FOR C) ABOVE, REASSIGN THE POLL FAILED DEU TO THE PREVIOUSLY      ]
 ]       CONTROLLING GPC USING ANOTHER DEU. ENTER 'GPC/CRT XY EXEC',   ]
 ]       WHERE X IS THE PREVIOUSLY CONTROLLING GPC AND Y IS THE POLL   ]
 ]       FAILED DEU. WHEN COMMUNICATION IS ESTABLISHED, RE-ENTER THE   ]
 ]       KEYBOARD COMMAND;                                             ]
 ]                                                                     ]
 ]   FOR D) ABOVE, RE-ENTER THE KEYBOARD COMMAND.                      ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 @
