On Mon, Jul 27, 2020 at 12:50 PM jim kraai <jimgkraai at gmail.com> wrote: > just skim this with ASCII & line printers or IBM 5151 green screens in mind > https://link.springer.com/content/pdf/bbm%3A978-1-137-31355-3%2F1.pdf That's the history of Unix right there! -- Todd