What are the contents of accumulator after execution of CMA instruction? If the initial contents of accumulator is 01H A) FEH B) FFH C) 01H D) F1H

Break Down the Problem

1. Understand the CMA instruction: It stands for "Complement Accumulator".
2. Determine the initial contents of the accumulator, which is given as 01H.

Relevant Concepts

1. The complement of a binary number inverts its bits (0s become 1s and 1s become 0s).
2. In hexadecimal format:
   • 01H in binary is 0000 0001.
   • Complementing this means changing each bit:
     • 0000 0001 becomes 1111 1110.

Analysis and Detail

1. Convert 01H to binary:
   • 01H = 0000 0001.
2. Take the complement:
   • CMA flips each bit, so:
     • 0000 0001 -> 1111 1110.
3. Convert the result back to hexadecimal:
   • 1111 1110 in binary equals FEH in hexadecimal.

Verify and Summarize

• The computation confirms that complementing 01H results in FEH.

Final Answer

After the execution of the CMA instruction, the contents of the accumulator will be FEH. Thus, the correct answer is A) FEH.