H01721 - WHITE SCREEN OR TRAP SWITCHING FROM WIN-OS/2 TO OS/2                
                                                                                
                                                                                
                                                                                
 SYMPTOM:                                                                       
 IBM PC 300 Series 6577 and 6587 may exhibit an all or partially                
 white screen or a Trap error when switching between a WIN-OS/2                 
 session and the OS/2 WARP Desktop.                                             
                                                                                
 PROBLEM ISOLATION AIDS:                                                        
 The following scenario is required to recreate the failing                     
 symptom:                                                                       
         1) Open the OS/2 System folder.                                        
         2) Open the Command Prompts folder.                                    
         3) Open an OS/2 or DOS Full Screen session.                            
         4) Type "WIN" or "WINOS2" and press Enter.                             
         5) Press ALT + ESC until the system hangs or traps.                    
            If the system hangs, the display will be all or                     
            partially white and the cursor may be displayed                     
            as a large black box.                                               
         6) Press Ctrl-Alt-Del to recover the system.                           
                                                                                
 The failure does not occur if the system is configured for VGA                 
 mode.                                                                          
                                                                                
 FIX:                                                                           
 The following changes must be made to the system configuration                 
 to eliminate this failure:                                                     
                                                                                
 1. Obtain the latest S3 Trio64/64V+ video device drivers.  The                 
    current driver level is v2.81-05 and is located in the IBM                  
    PC 300/700 Files section (#21) on the IBM PC Company BBS                    
    at 919-517-0001.                                                            
                                                                                
 2. Update the DOS Full Screen video settings in the following                  
    manner:                                                                     
    1) Click the right mouse button over the DOS Full Screen                    
       session icon.                                                            
    2) Click on Settings.                                                       
    3) Click on Session                                                         
    4) Click on DOS settings...                                                 
    5) Click on DOS video settings, then OK.                                    
    6) Verify that: VIDEO_8514A_XGA-IOTRAP = OFF                                
                    VIDEO_SWITCH_NOTIFICATION = ON                              
    7) Click on Save.  Exit, shutdown and reboot the system.                    
                                                                                
 3. View the README file on the video device driver update                      
    diskette to determine if the users system requires the                      
    following command to be added to the AUTOEXEC.BAT file:                     
                                                                                
        "COPY C:\WINDOWS\WINOS2.COM C:\WINDOWS\WIN.COM"                         
                                                                                
    The AUTOEXEC.BAT file executes whenever WIN or WINOS2                       
    is entered at an OS/2 or DOS Full screen command prompt.                    
                                                                                
 NOTE - When starting a Windows session from a DOS command line,                
        use the WINOS2 command rather than the WIN command.