Practice Two Address Instruction (24.4.3) - Lecture - 10 - Computer Organisation and Architecture

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6 sample questions

Question 1.
What does the opcode in an instruction signify?
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Think about what tells the CPU what to do.
Question 2.
In the instruction ADD R1, 30h, what are the operands?
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Look for the components after the opcode.
3Question 3.
What is the purpose of an opcode in an instruction?
- To indicate the operation
- To store data
- To define the memory address
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Focus on what keyword tells the CPU.
4Question 4.
True or False: In a two-address instruction, you can only manipulate one operand.
- True
- False
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Think about how many operands each instruction uses.
Question 5.
Design a two-address instruction for subtracting values stored in registers and explain the opcode's role.
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Think about how subtraction works in arithmetic.
Question 6.
Evaluate how a three-address instruction compares with a two-address version in terms of efficiency. Provide a reason why one might be preferred over the other.
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Consider the trade-offs in instruction design.

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