Microprocessor
Cycle stealing mode of DMA operation involves

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

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Microprocessor
Which one of the following is not correct?

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

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