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
 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
 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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Microprocessor
ALU (Arithmetic and Logic Unit ) of 8085 microprocessor consists of

 Accumulator, arithmetic and logic circuits
 Accumulator, arithmetic, logic circuits and five flags
 Accumulator, temporary register, arithmetic, logic circuits and five flags
 Accumulator, temporary register, arithmetic and logic circuits

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