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    An astonishing old calculator - Numberphile

    Numberphile

    1 HN recommender · recommended in 3 months, 2017–2023

    YouTube

    9:20 · 794K views · Nov 30, 2017

    Cliff Stoll shows and explains his two Friden EC-132 electronic calculators for Numberphile. The video covers how these early machines worked, including their unusual acoustic delay line memory.

    It is the go-to visual explanation of delay-line memory and early electronic calculators whenever the topic comes up.

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    3 comments from Hacker News

    1. @kdohertyDec 2017· in “Acoustic delay line memory (2014)”

      There is also a fantastic video where Cliff Stoll describes the Friden EC-132 calculator and shows off its acoustic delay line here: this video

      Strongly recommendsView on HN
    2. @major505Oct 2020· in “The Friden EC-130, one of the world's first electronic calculators”

      Cool way to store the bits. I saw the other day a video about an old eletronic calculator that stores itens in memory usinglike a piano wire, and microfones, and small speakers, to make the cord vibrate, and store the value. It was the Friden ec-132 this video

      CitesView on HN
    3. @db48xAug 2023· in “111,111.1 meters is reliably 1 degree of latitude”

      There were a lot of delay–line memories back in the day. It wasn’t just that they didn’t have memory chips; memory chips hadn’t been invented yet. this video

      CitesView on HN