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
 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
 The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses

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Microprocessor
In a vector interrupt

 the branch address is assigned to a fixed location in memory.
 the branch address is obtained from a register in the processor.
 the interrupting source supplies the branch information to the processor through an interrupt vector.
 none.

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