Well as you can see, there are 5 inputs on the left side. From top to bottom: 21a 20a 21b 20b and a reset function. you spark the inputs that you want to initiate to signify the number, and the 3x3 squares of LCRY signify 21o 20o. The 21 a and b do not work yet (as I said, only 1 bit numbers can be added). The reset input just resets the LCRY "display". If you still need a diagram I could make one or use the sign things and upload it.