Given the following decimal numbers:
A = 68 B = 77 C = -29 D = -110
Using 8-bit two's complement arithmetic, perform the following six calculations as they would be done on an 8-bit microprocessor. Recall that subtraction is performed by negating the second operand and adding, i.e. all operations are performed with a binary adder circuit.
1. A+B
2. A-B
3. A+C
4. A-C
5. C+D
6. C-D