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What will be contents of AL and status of CF in 8086 after the execution of the following instruction?


69. What will be contents of AL and status of CF in 8086 after the execution of the following instruction?
AL : 73
CL : 29
ADD AL, CL
DAA
Step 1: Addition Operation

Perform hexadecimal addition: 73H + 29H = 9CH.
After ADD AL, CL, AL = 9CH, CF = 0, and AF = 0.

Step 2: Decimal Adjust (DAA) Logic
  • Lower Nibble Check: The lower nibble (CH) is > 9. Therefore, add 06H to AL.
    9CH + 06H = A2H
  • Upper Nibble Check: The new upper nibble (AH) is > 9. Therefore, add 60H to AL.
    A2H + 60H = 102H
Step 3: Final Register State

The 8-bit register AL takes the lower two digits, and the overflow sets the carry flag.

AL = 02, CF = 1

Correct Option: 1. AL = 02, CF = 1
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