1+_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] S. JACKSON         ]    PASS PROGRAM NOTE        ]      105015      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] IBM/(713)282-8542  ]      RELEASE NOTE( )        ]      02/01/93    ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-21 AND SUBS                ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC ( )  VU (X)  SM/PL ( )] G9                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  TCS, IMU                                        ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  L5.3, V4.11A, V4.11                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]     SIMULTANEOUS I/O ON BOTH PORTS - FF1, FF2, FF3                  ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] TCS OPERATORS USING THE PORT SELECTION OPTION (ISSUE, READ, OR TEST ]
 ] OPERATORS, PORT MODE SPECIFIED IN DW 3 BIT 11) MAY RESULT IN THE    ]
 ] FF MDMS RECEIVING COMMANDS FROM BOTH TCS AND IMU I/O SIMULTANEOUSLY.]
 ] THIS WILL RESULT IN BIT 7 OF THE AFFECTED MDM'S BSR BEING SET ON    ]
 ] WHEN THE BSR IS NEXT READ.  ADDITIONALLY, THE CYCLE OF IMU I/O ON   ]
 ] WHICH THE SIMULTANEOUS COMMANDS WERE RECEIVED WILL SHOW STALE DATA. ]
 ] IF THE TCS COMMAND CONFLICTING WITH THE IMU I/O IS FROM A READ OR   ]
 ] TEST OPERATOR, INITIAL TIME OUT I/O ERRORS FOR THE TCS COMMAND MAY  ]
 ] BE SEEN AS WELL AS INITIAL TIME OUT I/O ERRORS FOR THE IMU I/O.     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] THE TCS COMMANDS WILL BE AUTOMATICALLY RETRIED UP TO 2 TIMES. THE   ]
 ] USER SHOULD WAIT UNTIL THESE RETRIES HAVE COMPLETED AND THEN THE    ]
 ] DATA REQUESTED VIA TCS SHOULD BE AVAILABLE.  IF NOT, REISSUING THE  ]
 ] TCS COMMAND SHOULD RESULT IN OBTAINING GOOD DATA.  THE CYCLIC IMU   ]
 ] I/O WILL PRODUCE VALID DATA ON THE NEXT NON-CONFLICTING I/O CYCLE.  ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM:    JEAN L. ZOPHY     DATE 03/24/93]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 03/30/93]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 04/01/93 ]
 ]PF MGR: ERIC C. BINGHAM   DATE 03/24/93]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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