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Previous Year Question (PYQs)

An instruction is stored at location $500$ with its address field at location $501$. The address field has the value $400$. A processor register $R_1$ contains the number $200$. Match the addressing mode $($List-I$)$ given below with effective address $($List-II$)$ for the given instruction:
List-I Addressing Mode List-II Effective Address
(a) Direct (i) 200
(b) Register indirect (ii) 902
(c) Index with $R_1$ as the index register (iii) 400
(d) Relative (iv) 600




Solution

Direct addressing:

$EA=400$

So, (a) $\rightarrow$ (iii)

Register indirect addressing:

$EA=R_1=200$

So, (b) $\rightarrow$ (i)

Index addressing:

$EA=Address+R_1$

$EA=400+200=600$

So, (c) $\rightarrow$ (iv)

Relative addressing:

Instruction is stored at location $500$, address field is at $501$, so next instruction location is $502$.

$EA=PC+Address$

$EA=502+400=902$

So, (d) $\rightarrow$ (ii)

Hence, correct matching is:

$(a)-(iii),\ (b)-(i),\ (c)-(iv),\ (d)-(ii)$


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