Engineering College

The opcode of MOV AX, BX is AX or BX. Select one: True False

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Answer 1

The opcode of the instruction MOV AX, BX is neither AX nor BX, but rather the binary code 10001011. This instruction moves the contents of register BX into register AX in the x86 assembly language.

This can be explained as follows:Opcode is the hexadecimal value of the operation code (op code) used to specify the instruction to be executed in a computer's central processing unit (CPU).It tells the processor what to do with the operands of the instruction (such as AX, BX in this case). The opcode is used to assemble machine code, which the CPU can then execute. In general, opcodes are used to specify operations that can be performed by a processor, such as moving data between registers (MOV), adding numbers (ADD), and comparing data (CMP).The opcode of MOV AX, BX is a two-byte instruction in which the first byte specifies the opcode (8B in hexadecimal) and the second byte specifies the registers involved in the instruction (C3 in hexadecimal). The instruction is encoded as follows: 8B C3. Hence, we can say that the answer is false.

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