Record number:       H132166                                                 
   Device:              D/T6571                                                 
   Model:               M                                                       
   Hit count:           UHC00000                                                
   Success count:       USC0000                                                 
   Publication code:    PC50                                                    
   Tip key:             003                                                     
   Date created:        O96/01/11                                               
   Date last altered:   A96/01/11                                               
   Owning B.U.:         USA                                                     
                                                                                
   Abstract:  PC300 486 Jumper Corrections                                      
                                                                                
                                                                                
                                                                                
 TEXT:                                                                          
 Below are items that have been reported to IBM as errors and/or                
 missing information in the area of PC 300 (486) jumpering                      
 and configuration.                                                             
                                                                                
 This tip will be periodically updated with additional                          
 information as required.                                                       
 ================================================================               
 IBM PC 300 486 based systems may contain a label on the                        
 underside of the top cover assembly that shows incorrect                       
 PCI/VL-Bus jumper settings.                                                    
                                                                                
 The correct positions for the PCI/VL-Bus jumper are documented                 
 in the May 1995 300/700 Series HMM on page 100 and illustrated                 
 below:                                                                         
                                                                                
 Selection |  JP3   |  JP4   |  JP13   |  JP7   |                               
 ----------+--------+--------+---------+--------+                               
 VESA      |  1-2   |  1-2   |  Open   |  Open  |                               
 Local     |        |        |         |        |                               
 Bus       |        |        |         |        |                               
 ----------+--------+--------+---------+--------+                               
 PCI       | 2-3    | 2-3    |  Close  | Close  |                               
 BUS       |        |        |         |        |                               
 ----------+--------+--------+---------+--------+                               
                                                                                
================================================================                
                                                                                
 PROCESSOR SPEED jumpers or CPU SPEED SELECTION jumpers:                        
                                                                                
 Some earlier field documentation was misleading or incorrect                   
 when addressing the CPU Speed Selection jumpers.  The chart                    
 below illustrates the correct orientation of the jumpers                       
 depending on the processor installed.                                          
                                                                                
  Speed     |  J35   !  J36   !  J37    |                                       
  ----------+--------+--------+---------+                                       
  20Mhz     |   ON   |  OFF   |  OFF    |                                       
  --------------------------------------|                                       
  25Mhz (D) |  OFF   |   ON   |   ON    |                                       
  ----------+--------+--------+---------|                                       
  33Mhz     |  OFF   |   ON   |  OFF    |                                       
  --------------------------------------|                                       
  40Mhz     |  OFF   |  OFF   |   ON    |                                       
  ----------+--------+--------+---------|                                       
  50Mhz     |  OFF   |  OFF   |  OFF    |                                       
  --------------------------------------+                                       
                                                                                
NOTE - Incorrect placement of the speed selection jumper may                    
       cause system failures and an incorrect Processor Speed                   
       designation in the systems Setup Utility.                                
                                                                                
       Always check the jumper settings on replacement system                   
       board FRU's to match the processor installed.  The                       
       default setting for replacement boards is the 25Mhz                      
       setting.                                                                 
 ================================================================               
                                                                                
                                                                                
 SAS KEYWORDS:                                                                  
    PSY2               PSVP               PSY2PART           PSVPPART           
    IBMPC              PC300              PC 330             PC350              
    6571               6573               6581               6583               
    D/T6571            D/T6573            D/T6581            D/T6583            
    PSVPERR            PSY2ERR            PSVPBRD            PSY2BRD