Microprocessor
S0 and S1 pins are used for

 indicating the processor’s status
 serial communication
 acknowledging the interrupt
None of these

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Microprocessor
Cycle stealing mode of DMA operation involves

 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
 While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor
 DMA controller taking over the address, data and control buses while a block of data is transferred between memory and I/O device

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