SD — sum digits
SD x
The sum of the original contents of digit i of AC and original contents of digit i of register x becomes stored in digit i of AC. The final value of digit i of AC is 0 if the values of difit i of AC and register x are alike; the final value of digit i of AC is 1 if the values of digit i of AC and register x are different.
SD | 00110 xxxxxxxxxxx |