In the Register Indirect addressing mode, the effective address of the datum in the base register or an index register that is specified by the instruction is

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UGC NET Paper 2: Electronic Science Nov 2020 Official Paper

\(EA = \left\{ {\begin{array}{*{20}{c}} {\left( {AX} \right)}\\ {\left( {DI} \right)}\\ {\left( {SI} \right)} \end{array}} \right\}\)
\(EA = \left\{ {\begin{array}{*{20}{c}} {\left( {BX} \right)}\\ {\left( {DI} \right)}\\ {\left( {SI} \right)} \end{array}} \right\}\)
\(EA = \left\{ {\begin{array}{*{20}{c}} {\left( {CX} \right)}\\ {\left( {DI} \right)}\\ {\left( {SI} \right)} \end{array}} \right\}\)
\(EA = \left\{ {\begin{array}{*{20}{c}} {\left( {DX} \right)}\\ {\left( {DI} \right)}\\ {\left( {SI} \right)} \end{array}} \right\}\)

Answer 1

Register Indirect Addressing mode:

In this addressing mode, the operand’s offset is placed in any one of the registers BX, BP, SI, DI as specified in the instruction.

The effective address of the data is in the base register or an index register that is specified by the instruction.

Hence, Option 2 is correct because it only contains the base register or index register for effective address.