bit    binary         hex      meaning
pos

bit 0: 0000 0000 0001 (0x001): carry
bit 6: 0000 0100 0000 (0x040): zero
bit 7: 0000 1000 0000 (0x080): sign
bit 11:1000 0000 0000 (0x800): overflow

          3    0    6   add
       0011 0000 0110
          3    8    6   add1
       0011 1000 0110
          b    1    7   add2
       1011 0001 0111