Question

For the given 8086 microprocessor instructions below, which is an invalid instruction?

• A. MOV BX, [0301 Η]
• B. MOV CX, 037AH
• C. MOV AL, BL
• D. MOV DS, 4100H

Hint:

Always remember the valid modes for memory addressing in microprocessors, especially segment registers. Segment registers cannot be loaded directly with values.

Answer 1

The Correct Option is D

In the 8086 microprocessor, the instruction MOV DS, 4100H is invalid because the data segment register (DS) can only be loaded using another register like AX, and not a direct value. All other instructions are valid and can be executed.