The design is modular so if you have one of each gate and a few LEDs sitting around you can give this a whirl. Posted in classic hacks , Misc Hacks Tagged binary , calculator , digital logic , dip ...

There was a brief period through the 1960s into the 1970s when the last word in electronics was the calculator. New models sold for hundreds of dollars, and owning one made you very special indeed.… ...

1954: IBM builds the first calculating machine to use solid-state transistors instead of vacuum tubes. IBM already had a business selling calculating machines, and it was humming along quite nicely.