H132520 - ADAPTEC 1640 SCSI ADAPTER FAILS IN PS/2 SYSTEMS                    
                                                                                
                                                                                
 SYMPTOM:                                                                       
 The Adaptec 1640 Micro Channel SCSI Adapter may fail to                        
 recognize attached SCSI devices such as the JetStore 2000 Tape                 
 Backup Unit or fail to boot from a hardfile that has DOS as                    
 the primary operating system.                                                  
                                                                                
 PROBLEM ISOLATION AIDS:                                                        
 PS/2 8556, 8557, 9556, 9557, 9576, 9577 and Server 500 systems                 
 may all be affected.                                                           
                                                                                
 Reported failures regarding the Adaptec 1640 Micro Channel SCSI                
 adapter include the following:                                                 
                                                                                
 1) PS/2 9577 running OS/2 2.11 with the Adaptec 1640 adapter                   
    and a JetStore 2000 Tape Backup Unit installed.  The                        
    "AHA1640.ADD" device driver would fail to load thus                         
    preventing the SCSI adapter from functioning properly.                      
                                                                                
 2) Any PS/2 model mentioned above with a hardfile connected to                 
    the Adaptec 1640 adapter AND loaded with either PC DOS or                   
    MS DOS would fail to boot.  The drive could be formatted with               
    DOS, but a hang condition occurs when the system is                         
    rebooted.                                                                   
                                                                                
 System and adapter diagnostics run without failures.                           
                                                                                
 FIX:                                                                           
 The Adaptec 1640 Micro Channel SCSI Adapter was not tested by                  
 IBM for use in PS/2 systems.  There is a BIOS incompatibility                  
 between the adapter and the PS/2 systems mentioned above.                      
                                                                                
 Customers that have purchased the Adaptec 1640 Micro Channel                   
 adapter for use in the PS/2 systems should be directed back                    
 to their point of purchase or to Adaptec Technical Support                     
 at 1-800-959-7274.