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

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Microprocessor
Assertion(A): Segment override prefix (SOP) is used when a default offset register is not used with its default base segment register but with a different base register. Reason(R): The offset registers IP and SP can never be associated with any other segment registers apart from their respective default segments.

 Both A & R are true but R is not the correct explanation of A.
 A is false but R is true.
 Both A & R are true and R is the correct explanation of A.
 A is true but R is false.

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