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

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

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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
 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

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Microprocessor
When .9432 E – 4 is subtracted from .5452 E – 3 in normalized floating point mode

.9432 E – 4 is changed to .09432 E – 3 and .5452 E – 3 is not changed
.5452 E – 3 is changed to 5.452 E – 4 but .9432 E – 4 is not changed
None of the numbers is changed
Both Ihe numbers are changed and their exponents are, made equal to -5

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