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. - SCATTER/GATHER UNLOCK REGION AX = 8106h DX = flags (see #03225) ES:DI -> Extended DMAsee Direct Memory Access descriptor structure (see #03222,#03223) returned by AX=8105h Return: CF clear if successful CF set on error AL = error code (see #03218) Note: according to the Microsoft version of the VDSsee Virtual DMA Specification specification, the actual scatter/gather list is ignored, while according to the IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. version of the specification, "the result of a LOCK operation" must be provided to this function SeeAlso: AX=8104h,AX=8105h Bitfields for VDSsee Virtual DMA Specification flags: Bit(s) Description (Table 03225) 0-5 reserved (zero) 6 EDDS contains page table entries 7 EDDS may contain not-present pages (entry = 0000h) 8-15 reserved (zero)