An instruction is stored at location 301 with its address...

An instruction is stored at location 301 with its address field at location 300 . The address field has the value 400. A processor register $R$, contains the number 200 . Evaluate the effective address and Match the following: (A) Direct (1) 702 (B) Immediate (2) 600 (C) Relative (3) 301 (D) Register Indirect (4) 400 (E) Index with $R_{1}$ as index (5) $\quad 200$ Register (A) $\mathrm{A}-4, \mathrm{~B}-3, \mathrm{C}-1, \mathrm{D}-5, \mathrm{E}-2$ (B) $\mathrm{A}-3, \mathrm{~B}-4, \mathrm{C}-1, \mathrm{D}-5, \mathrm{E}-2$ (C) $\mathrm{A}-4, \mathrm{~B}-3, \mathrm{C}-1, \mathrm{D}-2, \mathrm{E}-5$ (D) $\mathrm{A}-3, \mathrm{~B}-3, \mathrm{C}-1, \mathrm{D}-2, \mathrm{E}-5$

An instruction is stored at location 301 with its address field at location 300 . The address field has the value 400. A processor register $R$, contains the number 200 . Evaluate the effective address and Match the following:
(A) Direct
(1) 702
(B) Immediate
(2) 600
(C) Relative
(3) 301
(D) Register Indirect
(4) 400
(E) Index with $R_{1}$ as index
(5) $\quad 200$
Register (A) $\mathrm{A}-4, \mathrm{~B}-3, \mathrm{C}-1, \mathrm{D}-5, \mathrm{E}-2$
(B) $\mathrm{A}-3, \mathrm{~B}-4, \mathrm{C}-1, \mathrm{D}-5, \mathrm{E}-2$
(C) $\mathrm{A}-4, \mathrm{~B}-3, \mathrm{C}-1, \mathrm{D}-2, \mathrm{E}-5$
(D) $\mathrm{A}-3, \mathrm{~B}-3, \mathrm{C}-1, \mathrm{D}-2, \mathrm{E}-5$

Key Concepts

Direct Addressing

Direct addressing mode involves specifying the memory address of the operand explicitly within the instruction. When this mode is used, the effective address of the operand is taken directly from the address field provided in the instruction without further modification.

Immediate Addressing

Immediate addressing mode provides the operand itself within the instruction. Rather than referring to a memory location, the operand's value is embedded directly into the instruction, eliminating the need for an additional memory fetch.

Relative Addressing

Relative addressing mode calculates the effective address by adding a constant value or displacement, provided in the instruction, to a base value such as the program counter. This allows instructions to refer to operands in a flexible way that is position-independent or relative to the current instruction location.

Register indirect addressing mode uses the content of a specified register as the memory address where the operand is located. The instruction contains the register identifier, and the effective address is determined by the value stored in that register.

Index Addressing

Index addressing mode involves adding the contents of an index register to an address field within the instruction to compute the effective address. This mode is often used for array processing and accessing data structures, allowing the effective address to be calculated dynamically during program execution.

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