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
(-borrow) 0 0 1 0 0   0 0 1 1   1 1 1 1   1 1 0
          _______________________________________
            0 0 1 0   0 1 0 0   1 0 1 1   1 1 1 1
Zero:off  
Carry:off  
Sign:off
Overflow:off (subtraction of two like-signed values is always valid in 2's Complement)



            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
(-borrow) 0 1 1 1 0   0 0 0 1   1 0 0 0   1 1 0
          ________________________________________
            0 0 0 1   1 1 1 0   0 1 1 1   0 0 1  0
Zero:off
Carry:off
Sign:off
Overflow:on (negative minus a positive should be negative)



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