Function  07h   Direct Console Input Without Echo         (does not check BREAK) 
      Get or wait for char at STDIN, returns char in AL 
entry   AH      07h 
return  AL      character from standard input device 
note 1) Extended ASCII codes require two function calls. The first call returns 
	00h to indicate the next call will return an extended code. 
     2) No checking for Ctrl-C or Ctrl-PrtSc is done. 
     3) Input is redirectable.