Microprocessor
We say that a set of gates is logically complete if we can build any circuit without using any other kind of gates. Which of the following sets are logically complete

Set of {AND,OR}
Set of {AND,OR,NOT}
Set of {EXOR, NOT}
None of these

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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
 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

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Microprocessor
A microprocessor is ALU

 register unit and control unit on a single chip.
 register unit and I/O device on a single chip.
 and control unit on a single chip.
 and memory on a single chip.

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