This is the process of a device taking over the bus and bypassing the CPU. This is somewhat similar to DMA except that the device does not use DMA channels but accesses the bus (PCI for example) directly to transfer data. For example, bus mastering hard drives is common in modern computers. Bus mastering requires a true multitasking CPU (Pentium II or later) and a multitasking operating system such as Windows NT, Windows 2000, and Windows XP.
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