 +_____________________________________________________________________
  AUTHOR:                                          SMS: B26016A     
     LEMUEL GRADY        BFS PROGRAM NOTE          DR: 109638       
 ____________________                             __________________
  ORG/PHONE:          OPS NOTE (X)  USER NOTE ( )  DATE:  09/20/95  
  RID/(310) 922-0128       RELEASE NOTE ( )        REV A: 06/18/96  
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  OI/FLIGHT EFFECTIVITY:          USER AFFECTED:                     
   OI-23 THROUGH OI-26B           CREW (X)  GROUND (X)  DUMP ONLY ( )
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            MAJOR SOFTWARE AREA:             OPS MODES AFFECTED:     
 BSL( ) BSS( ) GNC( ) SEQ( ) SM/SP( ) IPL(X)        N/A              
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  SOFTWARE SUB-AREA:               IPL                                
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  PRINCIPAL FUNCTIONS:     AP101S P.O.O.; 85-C67-001 / 4.6 &          
                           GPCIPL P.R.D.; MG017202 / 3.1              
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  TITLE: CLOCK-1 HANDLER LIMITS FOR THE GPCIPL SCHEDULER ARE INCORRECT
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  DESCRIPTION:                                                        
                                                                      
  A FULLWORD THAT CONTAINS THE ADDRESS LIMITS FOR THE GPCIPL SCHEDULER
  THAT ARE USED BY A COMPARE BETWEEN LIMIT (CBL) INSTRUCTION IN THE   
  CLOCK-1 INTERRUPT HANDLER IS FORMATTED INCORRECTLY.  THIS FULLWORD  
  DEFINES THE UPPER AND LOWER LIMITS THAT ARE USED BY THE CBL         
  INSTRUCTION TO CHECK IF AN OPERAND IS WITHIN ITS LIMITS.            
                                                                      
  IF A CLOCK-1 INTERRUPT OCCURS DURING THE EXECUTION OF THE SCHEDULER,
  AN ERRONEOUS PUT-AWAY MAY BE PERFORMED.  THIS ERRONEOUS PUT-AWAY CAN
  POSSIBLY CAUSE A FAILURE THAT WOULD RESULT IN A BIG X AND POLL FAIL 
  MESSAGE ON THE DEU CRT.                                             
                                                                      
                                                                      
  NOTE: THIS PROBLEM AFFECTS ONLY THE CRITICAL MMU OPERATIONS.        
 _____________________________________________________________________
  USER RESPONSE:                                                      
                                                                      
  DURING A CRITICAL MMU OPERATION, IF A BIG-X AND A POLL FAIL         
  MESSAGE APPEAR ON THE CRT:                                          
                                                                      
  1. PUT THE GPC IN THE HALT MODE.                                    
  2. PERFORM A HISAM GPC MEMORY DUMP.                                 
  3. RECYCLE POWER AND RE-IPL THE GPC.                                
                                                                      
                                                                      
                                                                      
 _____________________________________________________________________
 CONCURRENCE:                           APPROVAL:                    
 RI: <S> D. CORBIN         DATE 06/25/96                             
     --------------------      ---------                             
 ASD:  ERIC C. BINGHAM     DATE 07/31/96                             
     --------------------      --------- DARRELL E. STAMPER 08/12/96 
 PF MGR: MARCIA KERR/EV5   DATE 07/31/96------------------- -------- 
        -----------------      --------- CHAIRMAN, SASCB      DATE   
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