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The document discusses interrupt driven data transfer and program interrupts. It describes how an external device can interrupt the computer when it is ready to transfer data, allowing the computer to momentarily pause its current program. This interrupt driven approach is more efficient than programmed data transfer which wastes computer time checking flags. The document also outlines the microoperations for fetch and decode cycles and interrupt cycles in interrupt driven data transfer, noting how the interrupt enable flip flop (IEN) allows the computer to be interrupted when set to 1.
