1+_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] C. E. ORTIZ        ]    PASS PROGRAM NOTE        ]        33643     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  JULY 1987 ]
 ] LSIS/282-8551      ]      RELEASE NOTE( )        ] REV B: 04/08/94  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-22 AND SUBS                ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )]  ALL                            ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  DEU, IPL                                        ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  SDEU                                          ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] DEU RECOVERY PROCEDURE FOLLOWING AN INVALID DEU IPL REQUEST         ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] A DEU IPL REQUEST IS VALID ONLY IN POST IPL OPS0, PL9, SM2 AND SM4  ]
 ] WHEN BOTH THE COMMON BUFFER AND THE MASS MEMORY ARE AVAILABLE.  IF  ]
 ] A DEU IPL REQUEST IS MADE AT ANY OTHER TIME (I.E., AN INVALID DEU   ]
 ] IPL REQUEST), THEN SUBSEQUENT TIME FILLS WILL CAUSE UNPREDICTABLE   ]
 ] PROBLEMS IN THE DEU SUCH AS THE COMPLETE BLANKING OF THE DEU EXCEPT ]
 ] FOR THE TIME LINES.                                                 ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]  A.  IF 'CM BUF BSY CRT' FAULT MESSAGE(S) ARE ANNUNCIATED AND THE   ]
 ]      DEU IPL IS NOT SUCCESSFUL, THE USER SHOULD WAIT UNTIL THE      ]
 ]      COMMON BUFFER IS AVAILABLE BEFORE ATTTEMPTING ANOTHER DEU IPL  ]
 ]      REQUEST                                                        ]
 ]                                                                     ]
 ]  B.  IF 'OFF/BUSY MMU' FAULT MESSAGE(S) ARE ANNUNCIATED AND THE     ]
 ]      DEU IPL IS NOT SUCCESSFUL, THE USER SHOULD WAIT UNTIL THE MMU  ]
 ]      IS AVAILABLE BEFORE ATTEMPTING ANOTHER DEU IPL REQUEST.        ]
 ]                                                                     ]
 ]      IF 'I/O ERROR MMU' FAULT MESSAGE(S) ARE ANNUNCIATED, THE DEU   ]
 ]      IPL WILL NOT BE SUCCESSFUL.  THE USER SHOULD TROUBLE-SHOOT THE ]
 ]      MMU FAILURE BEFORE ATTEMPTING ANOTHER DEU IPL REQUEST.         ]
 ]                                                                     ]
 ]                     - CONTINUED ON SUPPLEMENT PAGE -                ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:  HUGH D. STOVALL    DATE 05/10/94]                             ]
 ]     -------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 05/17/94]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 05/18/94 ]
 ]PF MGR: KAYLENE F. KINDT  DATE 05/10/94]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
 @


1+_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] DR:              ]
 ] C. E. ORTIZ        ]    PASS PROGRAM NOTE        ]        33643     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  JULY 1987 ]
 ] LSIS/282-8551      ]      RELEASE NOTE( )        ] REV B: 04/08/94  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ] DEU RECOVERY PROCEDURE FOLLOWING AN INVALID DEU IPL REQUEST         ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ]  C.  IF AN IPL REQUEST IS MADE IN AN UNSUPPORTED MEMORY CONFIGURA-  ]
 ]      TION, THE USER SHOULD PERFORM THE FOLLOWING RECOVERY PROCEDURE:]
 ]                                                                     ]
 ]      1.  ASSIGN DEU X TO GPC 0 VIA GPC/CRT KEY - THIS WILL ISOLATE  ]
 ]          DEU X AND PREVENT TIME FILLS.                              ]
 ]                                                                     ]
 ]      2.  TOGGLE DEU LOAD SWITCH FOR DEU X.                          ]
 ]                                                                     ]
 ]      3.  CHANGE MAJ FUNC SWITCH FOR DEU X TO CORRESPOND WITH A VALID]
 ]          DEU IPL MEMORY CONFIGURATION.                              ]
 ]                                                                     ]
 ]      4.  ASSIGN DEU X TO A GPC IN THE VALID DEU IPL MEMORY CONFIGU- ]
 ]          RATION SELECTED IN STEP 3 VIA GPC/CRT KEY.                 ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
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 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
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