DISK ERROR MESSAGES
 
     These error messages are returned through the DS and DS$ reserved 
     variables.
 
         NUM.    MESSAGE                     NUM.    MESSAGE
 
         01      <deleted>                   71      DIRECTORY ERROR         
         02      -                           72      DISK FULL               
         03      -                           29      DISK ID MISMATCH        
         04      -                           73      DOS MISMATCH            
         05      -                           74      DRIVE NOT READY         
         06      -                           63      FILE EXISTS             
         07      -                           62      FILE NOT FOUND          
         08      -                           61      FILE NOT OPEN           
         09      -                           52      FILE TOO LARGE          
         10      -                           64      FILE TYPE MISMATCH      
         11      -                           67      ILLEGAL SYSTEM T OR S   
         12      -                           66      ILLEGAL TRACK AND SECTOR
         13      -                           65      NO BLOCK                
         14      -                           70      NO CHANNEL              
         15      -                           51      OVERFLOW IN RECORD      
         16      -                           20      READ ERROR              
         17      -                           21      READ ERROR              
         18      -                           22      READ ERROR              
         19      -                           23      READ ERROR              
         20      READ ERROR                  24      READ ERROR              
         21      READ ERROR                  27      READ ERROR              
         22      READ ERROR                  50      RECORD NOT PRESENT      
         23      READ ERROR                  30      SYNTAX ERROR            
         24      READ ERROR                  31      SYNTAX ERROR            
         25      WRITE ERROR                 32      SYNTAX ERROR            
         26      WRITE PROTECT ON            33      SYNTAX ERROR            
         27      READ ERROR                  34      SYNTAX ERROR            
         28      WRITE ERROR                 39      SYNTAX ERROR            
         29      DISK ID MISMATCH            25      WRITE ERROR             
         30      SYNTAX ERROR                28      WRITE ERROR             
         31      SYNTAX ERROR                60      WRITE FILE OPEN         
         32      SYNTAX ERROR                26      WRITE PROTECT ON        
         33      SYNTAX ERROR            
         34      SYNTAX ERROR            
         35      -
         36      -
         37      -
         38      -
         39      SYNTAX ERROR            
         40      -
         41      -
         42      -
         43      -
         44      -
         45      -
         46      -
         47      -
         48      -
         49      -
         50      RECORD NOT PRESENT      
         51      OVERFLOW IN RECORD      
         52      FILE TOO LARGE          
         53      -
         54      -
         55      -
         56      -
         57      -
         58      -
         59      -
         60      WRITE FILE OPEN         
         61      FILE NOT OPEN           
         62      FILE NOT FOUND          
         63      FILE EXISTS             
         64      FILE TYPE MISMATCH      
         65      NO BLOCK                
         66      ILLEGAL TRACK AND SECTOR
         67      ILLEGAL SYSTEM T OR S   
         68      -
         69      -
         70      NO CHANNEL              
         71      DIRECTORY ERROR         
         72      DISK FULL               
         73      DOS MISMATCH            
         74      DRIVE NOT READY         
 
 NOTES
 
     Error message numbers 02-19, 35-38, 40-49, 53-59, and 68-69 should be 
     ignored. Message number 01 (<deleted>) gives information about the 
     number of files deleted with the SCRATCH command.