Microprocessor
When referring to instruction words, a mnemonic is

 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.
 a short abbreviation for the operand address.

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Microprocessor
Ready pin of microprocessor is used

 to indicate that microprocessor is ready to receive inputs
 to introduce wait state
 to indicate that microprocessor is ready to receive outputs
 to provide direct memory access

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