INT 31 - DOS32 v3.0+ - ALLOCATE 16KB DMA BLOCK

	AX = EE41h
Return: CF clear if successful
	    EBX -> 16KB DMA block (physical address)
	    EDX -> 16KB DMA block (offset address)
	CF set on error
SeeAlso: AX=EE40h,AX=EE42h