Microprocessor
A microprocessor differentiates between op code, data/address at any time by

 its internal registers
 the program counter
 the sequence in which memory contents are fetched by it
 the stack pointer

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Microprocessor
Cycle stealing mode of DMA operation involves

 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
 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

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Microprocessor
In an 8085 microprocessor based system, the contents of SP are 2000H. POP H instruction will transfer the contents of memory location

 2001H and 2002H to H and L registers respectively
 2001H and 2000H to H and L registers respectively
 2000H and 1999H to H and L registers respectively
 2000H and 1FFFH to H and L registers respectively

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