Number of addresses in an instruction, Computer Engineering

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Generally the Instruction Set Architecture (ISA) of a processor can be distinguished using five categories:

Operand Storage in the CPU - Where are the operands kept other than memory?
Number of explicitly named operands - How many operands are named in an instruction?
Operand location - Can any ALU instruction operand be located in memory? Or should all operands be kept internally in CPU registers?
Operations - What operations are offered in the ISA?
Type and size of operands - What is the type and size of every operand and how is it specified?

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