Online HelpPC 2.10      Quick Reference Utility     Copyright 1991 David Jurgens

 
                Device Command Codes (Device Request Header)                
                                                                                
      Code              Function                                                
                                                                                
        0    INIT                                                               
        1    MEDIA CHECK        (block devices,character = NOP)                 
        2    BUILD BPB          (block devices,character = NOP)                 
        3    IOCTL                                                              
        4    INPUT              (read)                                          
        5    NONDESTRUCTIVE INPUT NO WAIT (character devices)                   
        6    INPUT STATUS       (character devices)                             
        7    INPUT FLUSH        (character devices)                             
        8    OUTPUT             (write)                                         
        9    OUTPUT             (write with verify)                             
        10   OUTPUT STATUS      (character devices)                             
        11   OUTPUT FLUSH       (character devices)                             
        12   IOCTL OUTPUT                                                       
        13   DEVICE OPEN        (DOS 3.x)                                       
        14   DEVICE CLOSE       (DOS 3.x)                                       
        15   REMOVABLE MEDIA    (DOS 3.x)                                       
                                                                                
                                                                                
 

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