This was created in my test world by myself with the use of too many items and sp commands. Its a pretty simple calculator that consists of a few parts. The binary inputs (32 of them) go into rsnor latches (grey wool) which remember the input until the reset button is pressed, then the signal passes through xnor gates (light green) being used as a multiplexer, this is so that when the lever next to that is switched the b inputs are inverted for subtraction, then there is the 3 wide adders in orange and finally the input goes through the binary to hexadecimal to 7 segment decoders. In front of the decoders is some red wool vertical and gates, that's for the power switch to the display. Then the display itself uses pistons instead of torches. Its capable of adding up to 65000 something in hexadecimal, and doing subtraction, but no negative numbers yet. It still needs a control panel, but I was too lazy to make one! Big thanks to scjoiner on youtube for the idea of compacting this design down like this! And yes the display is hexadecimal, it is just too much of a hassle to do it in normal decimal on this scale! If you are unfamiliar with hex, search google for how to read it, you'll be glad you did! I placed signs around to help you operate it, any questions, just ask! Cheers!