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Bill Hammack (engineerguy) has an excellent video on the IBM Selectric titled IBM Selectric Typewriter & its digital to analogue converter.[1] [1] https://www.

• chiph 1y ago
  One of the Teletypes I used to work on had an eccentric-driven Wiffletree to position the typebox. This was necessary because of it's high speed[0] to decode the ASCII character set (it wasn't a Baudot machine). The selector cam at the end of the machine would do the serial-to-parallel conversion, then clutches would rotate the eccentrics powering the wiffletree to select the character. If you look at the ASCII chart [1] you can select a character via binary tree - the Wiffletree being a mechanical equivalent. [0] For a Teletype [1] https://en.wikipedia.org/wiki/ASCII#/media/File:USASCII_code_chart.svg https://en.wikipedia.org/wiki/ASCII#/media/File:USASCII_code...