INT E0 - REAL/32 - "MP_ALLOC" - ALLOCATE PHYSICAL MEMORY

	CL = B3h
	DX = number of 4K pages to allocate
Return: AX = number of first 4K page allocated, or FFFFh on error
Note:	memory allocated with this function is not automatically freed when
	  the process terminates
SeeAlso: INT E0/CL=B4h,INT E0/CL=B5h