Microprocessor
A mask programmed ROM is

 programmed by the user
 erasable electrically
 programmed at the time of fabrication
 erasable and programmable

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Microprocessor
In a vector interrupt

 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.
 none.
 the branch address is assigned to a fixed location in memory.

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