INT 21 P - FlashTek X-32VM - PHYSICAL ADDRESS MAPPING                           
	AX = 350Ah
	EBX = absolute physical address
	ECX = size in bytes of area to map
Return: CF clear if successful
	CF set on error (insufficient memory or service refused by DPMIsee DOS Protected-Mode Interface host)
Notes:	should not make repeated calls for the same physical address
	there is no provision for unmapping memory