Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 2Eh
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  Interrupt:   21h     Function:   2Eh
 
  Title:       Set Verify Flag
 
  See also:    Get Verify Flag
 
  Description:
 
     Turns off or turns on the operating-system flag for automatic
     read-after-write verification of data.
 
     Input                                     Output
 
     AH = 2Eh                                  None
     AL = 00h (if turning off verify flag)
        = 01h (if turning on verify flag)
     DL = 00h
                                    -♦-