3 D F 6
        +  2 5 9 A    (6+A)h = (6+10)d = 16d = (16+0)d = 10h
(+carry) 0 1 1 1      (F+9+1)h = (15+9+1)d = 25d = (16+9)d = 19h
        __________    (D+5+1)h = (13+5+1)d = 19h = (16+3)d = 13h

           6 3 9 0
Zero:off
Carry:off
Sign:off (6(h)= 0110(b))
Overflow:off (adding 2 positives; result positive --> OK)



           8 C 0 B
         + B 8 E 7
(+carry) 1 1 0 1
         _________
           4 4 F 2
Zero:off
Carry:on
Sign:off
Overflow:on (adding 2 negatives should give a negative result)




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