Microprocessor
At the beginning of a fetch cycle, the contents of the program counter are

 incremented by one.
 transferred to memory address register .
 transferred to memory data register.
 transferred to address bus.

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Microprocessor
In a vector interrupt

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

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