Question

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

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

Hint:

Always move segment values through general-purpose registers in 8086 microprocessors.

Answer 1

The Correct Option is D

- Directly loading an immediate value into the segment register (like DS) is invalid. 
- Instead, the value must first be loaded into a general-purpose register and then moved to the segment register. 
Conclusion: The invalid instruction is given by option (d).