How early could something like this have been built? The Greeks could certainly have managed the construction; the Antikythera device (100 BC or so) is much more complicated. Binary arithmetic, in its modern form with the ones and zeros, dates to Leibnitz in 1703. But as far as I can tell, the first binary adders were build out of relays in 1937.
Posted by Dan on Mar 19th, 2008