 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS:             ]
 ] C.WOHL/M.PHILLIPS  ]    BFS PROGRAM NOTE         ] DR: 55331        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] RID/3686           ]      RELEASE NOTE ( )       ] REV. 10/04/84    ]
 ]____________________]_____________________________]__________________]
 ] 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 (DCP 8.07)                                   ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG017300                                       ]
 ]_____________________________________________________________________]
 ] TITLE: INVALID KEYCODES(POSSIBLE POLL FAIL)                         ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] THERE IS A KNOWN 1.2 MICRO-SECOND WINDOW DURING WHICH THE DEU IS    ]
 ] SUSCEPTIBLE TO INVALID KEYCODES INPUT FROM THE KEYBOARD ADAPTER     ]
 ] UNIT. THE DCP SENSES THE PROBLEM AND THEN SETS THE MEMORY PARITY,   ]
 ] CPU ERROR, AND CRITICAL BITE INDICATORS. THIS CAUSES THE COMMAND-   ]
 ] ING GPC TO TERMINATE POLLING OF THAT DEU AND ANNUNICATE A DEU(N)    ]
 ] BITE ERROR MESSAGE ON THE ERROR MESSAGE LINE AND THE FAULT SUMMARY  ]
 ] PAGE. THEN DEU(N) DISPLAYS "POLL FAIL" IN THE LOWER RIGHT HAND      ]
 ] CORNER OF THE CRT. THERE HAVE BEEN ISOLATED INSTANCES OF INVALID    ]
 ] KEYCODES NOT NECESSASRILY ATTRIBUTABLE TO THIS TIMING WINDOW.       ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] USE OTP TO OBTAIN DATA AND THEN REASSIGN THE DEU TO THE COMMANDING  ]
 ] GPC. IF THE ERROR PERSISTS THEN THE DEU SHOULD BE SUSPECTED OF A    ]
 ] HARD FAILURE AND APPROPRIATE ACTION TAKEN.                          ]
 ]                                                                     ]
 ]  ACTION                      COMMENT                                ]
 ] ITEM D + 0F49    DISPLAY THE ERROR KEYCODE AND ERROR REGISTERS      ]
 ]                  BUFFERS. RECORD THE DATA.                          ]
 ]                                                                     ]
 ]            SEE SUPPLEMENTAL SHEET                                   ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]RI:<S>M. PHILLIPS         DATE 10/04/84]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 9/21/88 ]                             ]
 ]    --------------------      ---------] JACK G BOYKIN       9/22/88 ]
 ]PF MGR: MICHAEL BRIEDEN   DATE 9/19/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
 @




 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] SMS:             ]
 ]C.WOHL/M.PHILLIPS   ]    BFS PROGRAM NOTE         ] DR: 55331        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] RID/3686           ]      RELEASE NOTE ( )       ] REV. 10/04/84    ]
 ]____________________]_____________________________]__________________]
 ] TITLE: INVALID KEYCODES(POSSIBLE POLL FAIL)                         ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] ITEM E EXEC     EXIT THE OTP.                                       ]
 ] ITEM A EXEC     RE-INITIALIZE DEU.                                  ]
 ]  ON ANOTHER KEYBOARD                                                ]
 ] GPC/CRT ON EXEC ISOLATE DEU(N).                                     ]
 ] GPC/CRT YN      ASSIGN DEU(N) TO GPC Y: RE-ESTABLISHES POLLING      ]
 ]                                                                     ]
 ] FOR THE 1.2 MICRO-SECOND WINDOW PROBLEM, THE CONTENTS OF LOC.       ]
 ] 0F56 = 0102 AND LOC. 0F50 = FFF8. THERE COULD BE OTHER DATA IN      ]
 ] 0F50 REFLECTING OTHER INVALID KEYCODES.                             ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 @
