0 1 0 1   0 1 1 0   1 0 0 0   1 1 0 1
         + 0 0 1 1   0 0 0 1   1 1 0 0   1 1 1 0
(+carry) 0 1 1 1 0   1 1 1 1   0 0 0 1   1 0 0
         _______________________________________
           1 0 0 0   1 0 0 0   0 1 0 1   1 0 1 1
Zero:off  
Carry:off  
Sign:on  
Overflow:on (addition of 2 positives should not give a negative)


           1 0 0 0   1 1 1 1   0 0 1 1   1 0 0 1
         + 0 1 1 1   0 0 0 0   1 1 0 0   0 1 1 1
(+carry) 1 1 1 1 1   1 1 1 1   1 1 1 1   1 1 1
        ________________________________________
           0 0 0 0   0 0 0 0   0 0 0 0   0 0 0 0
Zero:on
Carry:on
Sign:off
Overflow:off (positive plus a negative always give correct 2's Complement results)



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