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 OUT OF DMAsee Direct Memory Access BUFFER AX = 810Ah DX = 0000h ES:DI -> DMAsee Direct Memory Access descriptor structure (see #03221,#03223) 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=8109h