Relative Addressing Mode

Question

A two word instruction is stored in memory at an address designated by symbol W. The address field of the instruction (stored at W+1) is designated by symbol Y. The operand used during the execution of the instruction is stored at an address symbolized by the Z. Which of the following is/are correct if the addressing mode used is the relative addressing mode?

1.   Z = M [Y] + (Y + 1)
2.   Z = (W + 2) + M [Y]
3.   Z = M[M[Y]] + Y
4.   Both (A) and (B)

Comments

which test series question is this?

I think answer should be 1.

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https://gateoverflow.in/105369/morris-mano-excercise

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https://gateoverflow.in/79281/relative-addressing-mode

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2

Answer 1

As the Relative addressing mode is used,

Memory location of operand = PC value + Address part of instruction.

PC value = (Y+1)  or (W+2)

API=M[Y] or M[W+1]

So, the answer is option D.