diskcomp A: A:    
with a compressed floppy, you get the message:                 
       Insert FIRST Diskette in Drive E:                       
       Press any key to continue. . .                          
       FIRST diskette bad or incompatible                      
       Compare process ended.                                  
       Compare another diskette (Y/N) ?                        
diskcomp B: B:
with B not compressed gives the error         
"You are attempting to DISKCOMP a STACKER compressed disk. 
Please unmount the diskette prior to copying by issuing a  
STACKER -(drive letter) command.  Example: STACKER -a:"  
The update diskcomp fixes both issues.  The first statement
has an incorrect error and the second issues prevents diskcomp
from working.