INT 14 - COMM-DRV v14.0 - SET USER INTERRUPT ROUTINE                            
	AH = 8Bh
	CX = bitmask of interrupt to process
	    00h = deinstall
	BX:DI -> DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address. containing address of function to be called
Return: AH bit 7 clear if successful
	AH bit 7 set on error