)
Values for 8516 Touch Screen function number:
 00h	check initialization and reset (see #03968)
 14h	set user-defined subroutine (see #03969)
Notes:	each driver function takes two stack parameters using Pascal calling
	  conventions: address of parameter block and address of results buffer
	all pointers are FAR pointers
	on return, AX contains the status of the call:
	    AX = 0000h successful
		 0001h invalid input
		 0002h interface error
		 0003h unable to perform function