One that shows up on HN occasionally is Setun: https://en.wikipedia.org/wiki/Setun https://en.wikipedia.org/wiki/Setun Setun used balanced ternary logic instea

One that shows up on HN occasionally is Setun: https://en.wikipedia.org/wiki/Setun https://en.wikipedia.org/wiki/Setun Setun used balanced ternary logic instead of binary logic. Each trit could be -1, 0, or +1. For numeric values, there was no need to store a sign, since the sign of a number would be inherent in its ternary value. Then the Soviets decided that it would be easier and faster to just copy western computers, and the concept wasn't developed any further.