Function  02h   Display Output 
      Outputs char in DL to STDOUT 
entry   AH      02h 
	DL      8 bit data (usually ASCII character) 
return  none 
note 1) If char is 08 (backspace) the cursor is moved 1 char to the left  
	(nondestructive backspace). 
     2) If Ctrl-C is detected after input, int 23h is executed. 
     3) Input and output are redirectable. If redirected, there is no way to  
	detect disk full.