Question

The instruction that is not possible among the following is

(a) MOV AX, [BX].

(b) MOV AX, 5555H

(c) MOV AX, [SI].

(d) MOV [SI], [DI].

This question was posed to me in an international level competition.

My enquiry is from Do’s and Don’ts While Using Instructions topic in chapter Special Architectural Features and Related Programming of Microprocessor

Answer 1

The correct answer is (d) MOV [SI], [DI].

Easy explanation: Both the operands cannot be memory operands.