 +_____________________________________________________________________
  AUTHOR:                                          SMS: B28029      
    D. D. PROSEK         BFS PROGRAM NOTE          DR:  109645      
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  ORG/PHONE:          OPS NOTE (X)  USER NOTE ( )  DATE: 08/02/95   
  RID/(310) 922-3701       RELEASE NOTE ( )                         
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  OI/FLIGHT EFFECTIVITY:          USER AFFECTED:                     
   OI-23, OI-24, OI-25 & OI-26A   CREW ( )  GROUND (X)  DUMP ONLY ( )
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            MAJOR SOFTWARE AREA:             OPS MODES AFFECTED:     
 BSL( ) BSS(X) GNC( ) SEQ( ) SM/SP( ) IPL( )  0,1,3 & 6              
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  SOFTWARE SUB-AREA: BOS                                              
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  PRINCIPAL FUNCTIONS: BSS PRD MG038101/TABLE 3.1.8.1-2               
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  TITLE: DUAL I/O ERROR CODES FOR DDU OUTPUTS                         
                                                                      
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  DESCRIPTION:                                                        
                                                                      
  WHENEVER A DDU OUTPUT ERROR IS DETECTED BY BOS, TWO DIFFERENT I/O   
  ERROR CODES WILL BE LOGGED.  THE I/O ERROR CODES LOGGED ARE AS      
  FOLLOWS:                                                            
                                                                      
         OI-23 & 24 :    "41" & "40" (HEXIDECIMAL)                    
         OI-25 & 26A:    "41" & "45" (HEXIDECIMAL)                    
                                                                      
  I/O ERROR CODE "41" IS CORRECT.  ERRORS "40" & "45" ARE ERRONEOUS.  
                                                                      
  NOTE: (1) DDU OUTPUT ERRORS ARE ONLY POSSIBLE WHEN BFS IS ENGAGED.  
        (2) I/O ERRORS ARE VISIBLE TO THE GROUND VIA THE DOWNLIST.    
                                                                      
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  USER RESPONSE:                                                      
                                                                      
   THERE IS NO USER RESPONSE.  OUTPUT ERRORS ARE RARE AND MOST LIKELY 
   INVOLVE A GPC BCE HARDWARE FAILURE.  IN THAT CASE, MULTIPLE I/O    
   ERRORS WOULD FLOOD THE ERROR LOG AND WOULD EASILY MASK ANY         
   ERRONEOUS DDU ERRORS.                                              
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
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 CONCURRENCE:                           APPROVAL:                    
 RI: <S> G. ALBRIGHT       DATE 08/04/95                             
     --------------------      ---------                             
 ASD:  ERIC C. BINGHAM     DATE 09/05/95                             
     --------------------      --------- DARRELL E. STAMPER 09/06/95 
 PF MGR: DAVID STEPHENSON  DATE 09/06/95------------------- -------- 
        -----------------      --------- CHAIRMAN, SASCB      DATE   
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