INT 67,49 - Get I/O Port Addresses (LIM EMS ≤ 3.0)

	AH = 49h
	ES:DI = far pointer to storage array


	on return:
	AL = board count  (0 < AL <= 4)
	AH = 00 success
	   = error code (see EMS STATUS)


	- defined in EMS 3.0, but undocumented in EMS 3.2;  new software
	  should not use this function, but old software still works
	- registers not listed are preserved