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
When referring to instruction words, a mnemonic is

 a short abbreviation for the data word stored at the operand address.
 a short abbreviation for the operand address.
 shorthand for machine language.
 a short abbreviation for the operation to be performed.

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