1+_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] M. QUEENER         ]    PASS PROGRAM NOTE        ]      25140       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  JULY 1987 ]
 ] IBM/282-7750       ]      RELEASE NOTE( )        ] REV B: 05/05/92  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-20 AND SUBS                ]  CREW ( )  GROUND (X)  DUMP ONLY (X)]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )]                                 ]
 ]                                   ]     ALL                         ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  I/O, BCE                                        ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  SBIO, SMIO                                    ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]         I/O ERROR LOG RESIDUAL WORD COUNT                           ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:  * REFERENCE DR 106630                                 ]
 ]                                                                     ]
 ]   THE RESIDUAL WORD COUNT FIELD IN THE I/O ERROR LOG IS ONLY        ]
 ]   ELEVEN BITS LONG, I.E. THE ELEVEN LEAST SIGNIFICANT BITS IN       ]
 ]   THE IOP LOCAL STORE REGISTER.  THEREFORE, IF AN I/O ERROR         ]
 ]   OCCURS ON A MMU TRANSACTION INVOLVING MORE THAN 2047 WORDS,       ]
 ]   THE RESIDUAL WORD COUNT MAY BE SIGNIFICANTLY IN ERROR.            ]
 ]                                                                     ]
 ]   RESIDUAL WORD COUNT VALUES IN THE I/O ERROR LOG MAY BE INACCURATE ]
 ]   BY ONE OR TWO HALFWORDS FOLLOWING AN MSC TIMEOUT I/O ERROR. THIS  ]
 ]   IS A RESULT OF THE CPU HALTING THE BCE BEFORE THE BCE HAS HAD AN  ]
 ]   OPPORTUNITY TO EXECUTE THE EXIT MICROCODE FOR ITS RECEIVE         ]
 ]   SEQUENCE.                                                         ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]    BE AWARE OF THE ABOVE CONDITIONS.                                ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 06/23/92]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 06/24/92]                             ]
 ]     -------------------      ---------] S. N. HARDEE, JR.  06/24/92 ]
 ]PF MGR:   SCOTT SEYL      DATE 06/23/92]------------------- -------- ]
 ]       ------------------     ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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