High School

Develop a short sequence of instructions that adds AL, BL, CL, DL, and AH, and saves the sum in the DH register.

Option 1:
- MOV AL, DH
- ADD BL, DH
- ADD CL, DH
- ADD DL, DH
- ADD AH, DH

Option 2:
- ADD AL, BL
- ADD AL, CL
- ADD AL, DL
- ADD AL, AH
- MOV DH, AL

Option 3:
- ADD AL, BL
- ADD BL, CL
- ADD CL, DL
- ADD DL, AH
- MOV DH, AL

Option 4:
- ADD AL, BL
- ADD BL, CL
- ADD CL, DL
- ADD DL, AH
- MOV DH, DL

Answer :

Final answer:

The correct sequence of instructions is Option 2: ADD AL, BL | ADD AL, CL | ADD AL, DL | ADD AL, AH | MOV DH, AL.

Explanation:

The correct sequence of instructions to add AL, BL, CL, DL, and AH and save the sum in the DH register is Option 2:

  1. ADD AL, BL
  2. ADD AL, CL
  3. ADD AL, DL
  4. ADD AL, AH
  5. MOV DH, AL

This sequence first adds AL and BL, then adds the result to CL, then adds that result to DL, and finally adds AH to get the final sum. The MOV instruction is then used to move the sum from the AL register to the DH register.

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