Microprocessor
Let the content of accumulator and register B be 0000 0100 and 0100 0000 respectively before execution of instruction SUB B. The content of accumulator after the execution of this instruction will be

 11000100
 01000000
 00000100
 010001000

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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.
 none.
 the interrupting source supplies the branch information to the processor through an interrupt vector.

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