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. - ENABLE DMAsee Direct Memory Access TRANSLATION
	AX = 810Ch
	BX = DMAsee Direct Memory Access channel number
	DX = 0000h
Return: CF clear if successful
	    ZF set if disable count decremented to zero
	CF set on error
	    AL = error code (see #03218)
SeeAlso: AX=810Bh