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Which of the following instruction is not valid?

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+1 vote
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in Microprocessor by (39.4k points)
Which of the following instruction is not valid?

(a) MOV AX, BX

(b) MOV DS, 5000H

(c) MOV AX, 5000H

(d) PUSH AX

The question was posed to me in an internship interview.

Question is taken from Instruction Set of 8086/8088 topic in division 8086/88 Instruction Set and Assembler Directives of Microprocessor

1 Answer

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by (49.2k points)
Correct answer is (b) MOV DS, 5000H

The explanation is: Both the source and destination operands cannot be memory locations except for string instructions.

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