I'm going to provide a terrible answer, but include a couple references that might be great for nostalgia. One is NostalgiaNerd on youtube, he provides a British viewpoint of IBM's shift to ASCII (OK they only did it through codepages, not really fully/completely ASCII).

The video is strangely titled, nothing about ASCII or EBCDIC in the name: "These keys shouldn't exist" (It's about the pipe sign, one has a space halfway down it on some keyboards) https://youtu.be/BktIY7VbrUs

And he references some handwritten notepads from early development days of ASCII here: https://longstreet.typepad.com/thesciencebookstore/2012/03/heres-the-link.html

I'm going to provide a terrible answer, but include a couple references that might be great for nostalgia. One is NostalgiaNerd on youtube, he provides a British viewpoint of IBM's shift to ASCII (OK they only did it through codepages, not really fully/completely ASCII).

The video is strangely titled, nothing about ASCII or EBCDIC in the name: "These keys shouldn't exist" (It's about the pipe sign, one has a space halfway down it on some keyboards) https://youtu.be/BktIY7VbrUs [Do note, this video might have a lot wrong info (per the comments on stack) I wasn't sure if I should strike or completely remove the link.]

If the video is error filled, NostalgiaNerd at least gives us some references to handwritten notepads from early development days of ASCII here: https://longstreet.typepad.com/thesciencebookstore/2012/03/heres-the-link.html