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posted by Jason Kottke  ·  gift link

A Gesture-Controlled Touchscreen Calculator Watch from 1984

In 1984, Casio released their AT-552 Janus watch, which had a feature that seems years ahead of its time to these modern eyes: a calculator that worked by drawing numbers and arithmetic operators right on the screen. Check out this demo:

As the video notes, this touchscreen tech didn’t take off back in the 80s because it was quite unreliable.