 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] PAUL TICE          ]    PASS PROGRAM NOTE        ]        37706     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  SEPT 1987 ]
 ] LSIS/282-7297      ]      RELEASE NOTE( )        ] REV E: 04/03/95  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI-22 AND SUBS               ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )]  ALL                            ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  DEU, IPL, ANNUNCIATION                          ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: SDEU                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]        I/O ERRORS AND FAULT MESSAGES ASSOCIATED WITH DEU IPLS       ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ] THERE ARE FIVE DIFFERENT DEU IPL SCENARIOS WHERE A CRT FAULT        ]
 ] MESSAGE MAY BE ANNUNCIATED AND/OR AN I/O ERROR MAY BE LOGGED        ]
 ] IN THE I/O ERROR LOG.                                               ]
 ] 1)  DURING A NOMINAL DEU IPL REQUEST, ONE INTERWORD TIMEOUT I/O     ]
 ]     ERROR (RWC=15) IS LOGGED IN THE I/O ERROR LOG.  THIS I/O        ]
 ]     ERROR IS EXPECTED WITH NO FAULT MESSAGE BEING ANNUNCIATED.      ]
 ]     THE DEU IPL COMPLETES SUCCESSFULLY.                             ]
 ] 2)  IF THE DEU LOAD SWITCH IS TOGGLED JUST PRIOR TO A POLL BY THE   ]
 ]     GPC (117 MILLISECONDS WINDOW), AN "I/O ERROR CRT" FAULT         ]
 ]     MESSAGE IS ANNUNCIATED, AND TWO I/O ERRORS ARE LOGGED IN THE    ]
 ]     I/O ERROR LOG.  THE FIRST I/O ERROR IS AN INITIAL TIMEOUT       ]
 ]     AND THE SECOND AN INTERWORD TIMEOUT I/O ERROR (RWC=15).         ]
 ]     THE DEU IPL COMPLETES SUCCESSFULLY.                             ]
 ] 3)  IF THE DEU IPL IS REQUESTED IN AN INVALID MEMORY CONFIGURATION, ]
 ]     TWO I/O ERRORS WILL BE LOGGED, AN "I/O ERROR CRT" FAULT MESSAGE ]
 ]     MAY BE ANNUNCIATED, AND THE DEU IPL WILL NOT COMPLETE.          ]
 ] 4)  IF THE COMMON BUFFER IS BUSY WHEN THE DEU IPL REQUEST IS MADE   ]
 ]     TWO I/O ERRORS WILL BE LOGGED, AND "I/O ERROR CRT" AND POSSIBLY ]
 ]     MULTIPLE "CM BUF BSY CRT" FAULT MESSAGES MAY BE ANNUNCIATED. THE]
 ]     DEU IPL MAY OR MAY NOT BE SUCCESSFUL.  IF SUCCESSFUL, THE NUMBER]
 ]     OF "CM BUF BSY CRT" MESSAGES WILL DEPEND ON HOW LONG THE COMMON ]
 ]     BUFFER IS BUSY.                                                 ]
 ]                                                                     ]
 ]                                                                     ]
 ]                   - CONTINUED ON SUPPLEMENT PAGE -                  ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:  JEAN L. ZOPHY      DATE 05/09/95]                             ]
 ]     -------------------      ---------]                             ]
 ]ASD:   ERCI C. BINGHAM    DATE 05/09/90]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 05/11/95 ]
 ]PF MGR: KAYLENE F. KINDT  DATE 05/10/95]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
 @





 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] DR:              ]
 ] PAUL TICE          ]    PASS PROGRAM NOTE        ]        37706     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  SEPT 1987 ]
 ] LSIS/282-7297      ]      RELEASE NOTE( )        ] REV E: 04/03/95  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ]        I/O ERRORS AND FAULT MESSAGES ASSOCIATED WITH DEU IPLS       ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] 5)  IF THE MMU IS FAILED, OFF OR BUSY WHEN THE DEU IPL REQUEST IS   ]
 ]     MADE, AT LEAST TWO I/O ERRORS WILL BE LOGGED AND "I/O ERROR     ]
 ]     CRT", "OFF/BUSY MMU" OR "I/O ERROR MMU" FAULT MESSAGE(S) MAY    ]
 ]     BE ANNUNCIATED.  FOR THE MMU OFF/BUSY CASES, THE DEU IPL MAY OR ]
 ]     MAY NOT BE SUCCESSFUL.  IF SUCCESSFUL, THE NUMBER OF "OFF/BUSY  ]
 ]     MMU" MESSAGES WILL DEPEND ON HOW LONG THE MMU IS OFF/BUSY.  FOR ]
 ]     THE "I/O ERROR MMU" FAULT MESSAGE CASE, THE DEU IPL WILL NOT BE ]
 ]     SUCCESSFUL.                                                     ]
 ]                                                                     ]
 ] FOR CASES 3, 4, AND 5, IF TIMING WINDOW DESCRIBED IN PARA. 2 IS NOT ]
 ] ENCOUNTERED, THE FIRST I/O ERROR WILL BE AN INTERWORD (RWC=15)      ]
 ] TIMEOUT FOLLOWED BY EITHER AN INITIAL TIMEOUT OR ANOTHER INTERWORD  ]
 ] TIMEOUT I/O ERROR.                                                  ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]  1) IGNORE THE FAULT MESSAGE(S) AND OR I/O ERROR LOG ENTRIES IF THE ]
 ]     DEU IPL COMPLETES SUCCESSFULLY.                                 ]
 ]                                                                     ]
 ]  2) IF THE CAUSE OF THE DEU IPL FAILURE IS DUE TO AN INVALID MEMORY ]
 ]     CONFIGURATION, COMMON BUFFER BUSY, OR THE MASS MEMORY BEING     ]
 ]     FAILED/OFF/BUSY, REFER TO USER NOTE 33643 FOR THE RECOVERY      ]
 ]     PROCEDURES                                                      ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 @
