INT 2F - MDEBUG display driver - RESERVED FUNCTION NUMBERS                      
	AH = D0h
	AL = 06h-7Fh
Note:	these functions are reserved for future use
                                                                                

INT 2F - MDEBUG display driver - USER DEFINED FUNCTION NUMBERS                  
	AH = D0h
	AL = 80h-FFh
Note:	these functions numbers are reserved for user defined features (e.g.
	  communication between the transient und resident parts of the driver)