INT 4B - Virtual DMA SpecificationA set of interrupt calls which permit the use of DMA even on systems running in protected or Virtual-86 mode with their address remapping, or systems such as Micro Channel PSIBM PS/2, any model/2s with multiple bus masters independently performing DMA operations. - COPY INTO DMAsee Direct Memory Access BUFFER
	AX = 8109h
	DX = 0000h
	ES:DI -> DMAsee Direct Memory Access descriptor structure (see #03221,#03222) with buffer ID,
		  region segment/offset, and region size fields set
	BX:CX = starting offset into DMAsee Direct Memory Access 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