To this day, it is unknown how the Inka calculated with their mysterious abacus, the Yupana.

Perhaps of interest to you:

Bruderer, H. (2024). How did the Inka Calculate? The Yupana, a Mysterious Peruvian Abacus.

Bruderer, H. (2024). Yupana, ein rätselhafter peruanischer Abakus. Wie haben die Inka gerechnet?

And:

The fake chess-playing automaton:

Chess robots, from a fake automaton to a world champion-defeating program.