INT 4B - Virtual DMA Specification - COPY INTO DMA BUFFER

	AX = 8109h
	DX = 0000h
	ES:DI -> DMA descriptor structure (see #03221,#03222) with buffer ID,
		  region segment/offset, and region size fields set
	BX:CX = starting offset into DMA buffer
Return: CF clear if successful
	CF set on error
	    AL = error code (see #03218)
BUG:	Windows 3.0 Enhanced mode does not correctly interpret the copy count
SeeAlso: AX=810Ah