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NIELIT 2017 DEC Scientist B - Section B: 59

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A two-word instruction is stored in a location $A$. The operand part of instruction holds $B$. If the addressing mode is relative, the operand is available in location

  1. $A+B+2$
  2. $A+B+1$
  3. $B+1$
  4. $A+B$
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In relative addressing mode Effective address= Program counter+ Address specified.

Here Program counter= A+2, Address specified.=B

Effective address= A+2+B

Answer: A

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It is given that instruction size is 2 words, and it’s starting address is A.
When executing the present instruction program counter gets incremented to the address of the next instruction.
So, latest value in PC=A+2.
In the instruction operand value is B, which is used as a offset for the effective address calculation.
So, Effective address= Program counter + Offset.
Here Program counter= A+2, Offset = B
Effective address= A+2+B
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