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Overflow error in ALU (Flags (carry flag (ON (0000 - 0001 = 1111 The…

- - - - 0000 - 0001 = 1111
        The subtraction requires a borrow in the most significant (leftmost) bits subtracted.
      - 1111 + 0001 = 0000
        The addition of two numbers causes a carry out of the most significant (leftmost) bits added.
    - - 0111 + 0001 = 1000
      - 1000 - 0001 = 0111
  - - - 0100 + 0100 = 1000
        Two numbers with the sign bits off results in the sign bit on.
      - 1000 + 1000 = 0000
        Two numbers with the sign bits on results in the sign bit off.
    - - 0100 + 0001 = 0101
      - 0110 + 1001 = 1111
      - 1000 + 0001 = 1001
      - 1100 + 1100 = 1000