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 Z. An index register contains the value X. State how Z calculated from other addresses if the addressing mode is the instruction is
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The instruction is stored at address W. This means the instruction itself is located in memory at this address. Show more…
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The 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 the symbol $Y$. The operand used during the execution of the instruction is stored at address symbolized by $Z$. An index register contains the value $X$. State how $Z$ is calculated from the other addresses if the addressing mode of the instruction is (A) Direct (1) $Z=\operatorname{Mem}(Y)$ (B) Indirect (2) $\quad Z=Y+W+2$ (C) Relative (3) $Z=Y+X$ (D) Indexed (4) $\quad Z=Y$ (A) $\mathrm{A}-4, \mathrm{~B}-1, \mathrm{C}-2, \mathrm{D}-3$ (B) $\mathrm{A}-3, \mathrm{~B}-1, \mathrm{C}-2, \mathrm{D}-4$ (C) $\mathrm{A}-4, \mathrm{~B}-2, \mathrm{C}-1, \mathrm{D}-3$ (D) $\mathrm{A}-3, \mathrm{~B}-2, \mathrm{C}-1, \mathrm{D}-4$
Computer Organization and Architecture
Machine Instructions, Addressing Modes
A relative mode branch type of instruction is stored in memory at an address equivalent to decimal 750 . The branch is made to an address equivalent to decimal 400 . The relative address value in binary using 12 -bits, will be (A) 000101011111 (B) 100101011111 (C) 111010100000 (D) 111010100001
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