Microprocessor
Cycle stealing mode of DMA operation involves

 While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor
 The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses
 DMA controller taking over the address, data and control buses while a block of data is transferred between memory and I/O device
 Data transfer takes place between the I/O device and memory during every alternate clock cycle

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Microprocessor
Which one of the following is not correct?

 An interrupt signal is required at the start of every program
 Bus is a group of wires
 An instruction is a set of bits that defines a computer operation
 Bootstrap is a technique or device for loading first instruction

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