Function  16h   Create A Disk File                                        (FCB) 
      Search and open or create directory entry for file 
entry   AH      16h 
	DS:DX	pointer to an Struct -FCB
return  AL      00h     successful creation 
		0FFh    no room in directory 
note 1) If a matching directory entry is found, the file is truncated to zero 
	bytes. 
     2) If there is no matching filename, a filename is created. 
     3) This function calls function 0Fh (Open File) after creating or  
	truncating a file. 
     4) A hidden file can be created by using an extended FCB with the attribute 
	byte (offset FCB-1) set to 2.