INT 67,4F - Get/Set Partial Page Map (LIM EMS 4.0+)

	AH = 4Fh

	AL = 00  get partial page map
	     DS:SI = pointer to structure containing list of segments whose
		     mapping contexts are to be saved
	     ES:DI = pointer to array to receive page map

	AL = 01  set partial page map
	     DS:SI = pointer to structure containing saved partial page map

	AL = 02  get size of partial page map
	     BX = number of mappable segments in the partial map to be saved


	on return:
	AH = 00  success
	   = error code (see EMS STATUS)
	AL = size of partial page map (if AL=2)