Function  2Eh  Set/Reset Verify Switch 
     Set verify flag                                                      
entry   AH      2Eh 
	AL      00      to turn verify off (default) 
		01      to turn verify on 
return  none 
note 1) This is the call invoked by the DOS VERIFY command 
     2) Setting of the verify switch can be obtained by calling call 54h 
     3) This call is not supported on network drives 
     4) DOS checks this flag each time it accesses a disk