 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] L. ORTIZ           ]    PASS PROGRAM NOTE        ]        102825    ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  08/23/88  ]
 ] LSIS/282-7458      ]      RELEASE NOTE( )        ] REV C: 07/17/95  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI-25 AND SUBS               ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC ( )  VU (X)  SM/PL ( )]     G1, G9                      ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:   I/O                                            ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: SBIO                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]         MEC E-BIT I/O ERROR                                         ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] IF A MEC PREFLIGHT BITE READ COMMAND IS ISSUED TO THE MEC WITHIN    ]
 ] 6.51 MILLISECONDS FOLLOWING THE OUTPUT OF MEC CRITICAL COMMAND OR   ]
 ] WITHIN 30 MILLISECONDS FOLLOWING A MASTER RESET COMMAND, THE MEC    ]
 ] WILL RESPOND TO THE PREFLIGHT BITE REQUEST WITH AN E-BIT ERROR.     ]
 ]                                                                     ]
 ] NO CHECKING IS PERFORMED BY THE FSW TO ENSURE THAT INDIVIDUAL       ]
 ] REQUESTS DO NOT FALL WITHIN THE 6.51 OR THE 30 MILLISECOND WINDOWS  ]
 ] WHERE THE MEC WILL RESPOND WITH AN E-BIT ERROR.  THE FSW DOES       ]
 ] HAVE A 40 MILLISECONDS BUILT-IN DELAY FOR TCS MEC COMMANDS WITH A   ]
 ] READ-BITE-AFTER OPTION.                                             ]
 ]                                                                     ]
 ] ALTHOUGH CURRENT FLIGHT PROCEDURES NO LONGER ISSUE MEC PREFLIGHT    ]
 ] BITE COMMANDS VIA SACS IN G1 WHICH CAN CONFLICT WITH THE MEC QUAD   ]
 ] CRITICAL COMMANDS FROM THE HFE OUTPUT, A SIMILAR SITUATION          ]
 ] IS PRESENTED IN G9 WHEN A TCS SEQUENCE THAT ISSUES MEC CRITICAL     ]
 ] COMMANDS IS RUNNING.                                                ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] BE AWARE THAT ONE AND POSSIBLY TWO E-BIT I/O ERRORS CAN OCCUR WITH  ]
 ] A TCS/SACS REQUEST FOR MEC PREFLIGHT BITE DATA.                     ]
 ]                                                                     ]
 ] EXPECTED I/O ERROR SIGNATURES:                                      ]
 ]  MEC 1 READ:  BCE=14; DEV ID=70; STAT REG=0290 0000                 ]
 ]  MEC 2 READ:  BCE=15; DEV ID=71; STAT REG-02A0 0000                 ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:  JEAN L. ZOPHY      DATE 08/15/95]                             ]
 ]     -------------------      ---------]                             ]
 ]ASD:   ERIC C. BINGHAM    DATE 08/15/95]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 08/24/95 ]
 ]PF MGR: ERIC C. BINGHAM   DATE 08/15/95]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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