Microprocessor
In a vector interrupt

 none.
 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.

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Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 More than one device can transmit information over the data bus by enabling only one device at a time
 The data line can be multiplexed for both input and output
 More than one device can transmit over the data bus at the same time
 It increases the speed of data transfer over the data bus

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Microprocessor
Program counter in a digital computer

 Counts the number of times the loops are executed.
 Counts the number of times a subroutine is called.
 Counts the numbers of programs run in the machine.
 Points the memory address of the next instruction to be fetched.

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