1. Using the “LogicWorks” tool, build a 1-bit full adder/subtractor that is made of only
NOR gates. Label all inputs as well as all of the outputs of the 1-bit full adder/subtractor.
2. Using the “LogicWorks” tool and using the 1-bit full adder/subtractor that you have built
in step (1), build a 4-bit ripple-carry adder/subtractor. Label all inputs as well as all of the
outputs of the 4-bit ripple-carry adder/subtractor. Use two “Hex Keyboard” devices under
the “Simulation IO” library to connect to the inputs of your circuit instead of using