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An astonishing old calculator - Numberphile
About this video
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.
Why it appears in the archive
It is the go-to visual explanation of delay-line memory and early electronic calculators whenever the topic comes up.
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From the Hacker News discussion
There is also a fantastic video where Cliff Stoll describes the Friden EC-132 calculator and shows off its acoustic delay line here: [VIDEO]
Read original comment ↗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 [VIDEO]
Read original comment ↗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. [VIDEO]
Read original comment ↗