 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] J. SOLLINGER       ]    PASS PROGRAM NOTE        ]     100718       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  09/22/88  ]
 ] IBM/282-8461       ]      RELEASE NOTE( )        ] REV A: 01/03/91  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]   OI7D AND SUBS               ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )] G9, P9                          ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: LDB                                              ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: LDB                                            ]
 ]_____________________________________________________________________]
 ] TITLE:   DUAL LDB CONFIGURATION SYMPTOMS                            ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] AFTER A COMMON SET CONFIGURATION IS ESTABLISHED IN WHICH TWO DIF-   ]
 ] FERENT MEMORY CONFIGURATIONS (E.G. G9 AND P9) ARE EACH GIVEN CON-   ]
 ] TROL OF A LAUNCH DATA BUS WITH POLLING ENABLED, THERE ARE SEVERAL   ]
 ] UNIQUE SYMPTOMS WHICH ARE INCONSISTENT WITH POLLING IN A SIMPLEX    ]
 ] GPC ENVIRONMENT.                                                    ]
 ]                                                                     ]
 ] FOR EXAMPLE, V92X7746XX MAY BE INCONSISTENT WITH ACTUAL LDB I/O     ]
 ] ERRORS IN THE G9 GPC SINCE THIS PARAMETER IS BASED ON A CS PARA-    ]
 ] METER ICC'D FROM A CS GPC WHICH HAS PERFORMED A BUS SWITCH BASED    ]
 ] ON ERROR CONDITIONS.  IN ADDITION, THE LDB AUTO SWITCH PARAMETER    ]
 ] MAY BE AUTOMATICALLY RE-ENABLED BY THE S/W (IF PREVIOUSLY DISABLED  ]
 ] BY TCS/SACS OP CODE 7) IN EITHER CS GPC AS A RESULT OF OPS TRANSI-  ]
 ] TION/MODE RECALLS.                                                  ]
 ]                                                                     ]
 ] UPON RECOVERY FROM THE DUAL LDB CONFIGURATION, THE FSW MAY AUTOMATI-]
 ] CALLY SWITCH TO THE ALTERNATE LDB AS A RESULT OF PARAMETERS ICC'D   ]
 ] DURING THE CS DUAL LDB CONFIGURATION.                               ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ] BE AWARE OF THESE UNIQUE MANIFESTATIONS OF DUAL LDB POLLING CONFIG- ]
 ] URATIONS.  MORE SEVERE MANIFESTATIONS (E.G. CS FTS, LOSS OF POLLING,]
 ] DUAL COMMANDERS ON THE SAME BUS, ETC.) MAY OCCUR IF PROPER PROCE-   ]
 ] DURES ARE NOT FOLLOWED IN SETTING UP OR RECOVERY FROM A CS DUAL     ]
 ] LDB CONFIGURATIONS.                                                 ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 01/15/91]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:  ROBERT N. HINSON   DATE 01/16/91]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 01/22/91 ]
 ]PF MGR:ELIZABETH FOUNTAIN DATE 01/16/91]------------------- -------- ]
 ]       ------------------     ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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