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Module 2: x86 Architecture, CPU Control, I/O, Memory System Design

20252m

Which addressing mode uses the contents of a register to determine the effective address?
(i) Signed integers
(ii) Indirect addressing
(iii) Direct addressing
(iv) Register addressing

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Answer: (iv) Register addressing (closest; more precisely Register Indirect)

Explanation: Register addressing uses register contents as address: EA = (R). Options given are confusing; (ii) Indirect addressing uses memory contents pointed by register. (iii) Direct uses address field directly. Register addressing means operand is in register. If question expects "Register indirect", choose Indirect or Register addressing. Here Register addressing (iv) is marked correct.

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