This mod features a homemade calculator that is designed with a look of the 70s by using a wooden box to house multiple small circuit boards while everything is connected together by the reams of colored wires. The final product would look like the one in the below image.

Using one of the then-new-single-chip 4-function calculator ICs available at the time, a calculator was built from scratch in 1972 by an engineer. The single chip during that time is responsible for doing all the mathematical calculations. It is not designed to directly drive a display. This implies that building such a calculator would require a lot of parts. Using the common method back then of drawing the circuit traces and pads with a Sharpie pen and etching the copper clad phenolic board using ferric chloride, several circuit boards were designed and fabricated. Shown below are the connections inside the calculator as well as the setup of the power supply.