IBM Selectric Typewriter & its digital to analogue converter
4 人推荐 · 跨 5 个月 · 2016–2025
中文导读
engineerguy 的 Bill Hammack 借助高速慢镜头摄影，拆解了 IBM Selectric 电动打字机鬼斧神工的内部机械，重点展示了其纯机械实现的数模转换器（DAC）如何将按键动作精妙转化为打字球的立体旋转。
为什么 HN 推它
每当大家聊起打字机或复古机械设计时，Hacker News 读者必然首推这个视频，称得上用几分钟吃透精密机械内幕的最佳科普。
「强烈推荐大家都去看一看。」HN 网友原话：I highly recommend watching
英文原摘要（HackerTube / Claude 整理）
Bill Hammack of engineerguy uses slow motion video to show how the IBM Selectric typewriter works. He focuses on its fully mechanical digital-to-analog converter, which turns key presses into rotation of the type ball.
HN commenters recommend it whenever the Selectric comes up, as a short, excellent explanation of its internals.
HN 上的提及
You may enjoy Bill Hammack's video
Explains Selectric swappable typeballs
Example of hidden complexity behind familiar hardware
One of the interesting things about the Selectric is that it contains a mechanical digital-to-analog converter
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