found these videos about the plato system https://www.youtube.com/watch?v=tTmWcGhlXqA https://www.youtube.com/watch?v=tTmWcGhlXqA https://www.youtube.com/watch

found these videos about the plato system https://www.youtube.com/watch?v=tTmWcGhlXqA https://www.youtube.com/watch?v=tTmWcGhlXqA https://www.youtube.com/watch?v=THoxsBw-UmM https://www.youtube.com/watch?v=THoxsBw-UmM also there is https://en.wikipedia.org/wiki/PLATO_(computer_system) https://en.wikipedia.org/wiki/PLATO_(computer_system) they mention that they were linked by a network, is it known what kind of transport protocol they were using on the CDC systems?