Microprocessor
The first machine cycle of an instruction is always

 An I/O read cycle
 A memory read cycle
 A memory write cycle
 A fetch cycle

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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.
 a short abbreviation for the data word stored at the operand address.
 shorthand for machine language.

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