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To make the circuit work, Set the first number using the four inputs in the left, and under that activate and deactivate the one under them in the left, to load the second number, set the numbers again, and press the one under them to the right. You will see the first number in hex in the "units" part of the display, the other display is the "16ths" part of the display. Activate the input on the far right to begin the adding, the circuit will add to the first number and subtract from the second number, until the second number is 0. When the displays stop changing, you can read the output. When you want to reset the numbers, activate and deactivate the input under the "first or second number" inputs. Enjoy!
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