Daniel Bali has posted a breakdown of how he achieved this feat on Medium.com.In an article called "Cities: Skylines is Turing Complete", the creator talks about how he's created a four-bit adder ...

This full adder is constructed using two Feynman gates and a multiplexer. Fig. 8: Internal RTL of a reversible full adder. A Feynman Gate is a 2*2 reversible logic circuit. This gate placed in the ...

Anyone reading this uses computers, and a few very cool people have built their own computer out of chips, [zaphod] is doing something even cooler over on hackaday.io: he’s building a compute… ...