Microprocessor
The instruction set of a microprocessor

 is stored inside the microprocessor
 is specified by the manufacturers
 is specified by the user
 cannot be changed by the user

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Microprocessor
When referring to instruction words, a mnemonic is

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

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