The Friendly Orange Glow (which a few of these reference) has easily the most information I've ever seen about PLATO in one place. (Perhaps more than you'd like, if you don't care for the university politics surrounding it - but hey, it's comprehensive.) For anyone who's at all interested in PLATO, I'd recommend giving it a read.
Irata.online: A PLATO service for retro computing enthusiasts - https://news.ycombinator.com/item?id=32600338 - Aug 2022 (26 comments)
The PLATO Project - https://news.ycombinator.com/item?id=29782661 - Jan 2022 (1 comment)
Irata.online a modern implementation of the PLATO computing system - https://news.ycombinator.com/item?id=24207044 - Aug 2020 (1 comment)
John Hunter’s World Peace Game, Roger Ebert, and the PLATO System - https://news.ycombinator.com/item?id=23460259 - June 2020 (9 comments)
PLATO, Graphics, Time-sharing in 1960s - https://news.ycombinator.com/item?id=21830810 - Dec 2019 (1 comment)
PLATO Notes released 40 years ago today - https://news.ycombinator.com/item?id=21186845 - Oct 2019 (1 comment)
A Look Back at the 1960s PLATO Computing System - https://news.ycombinator.com/item?id=16615420 - March 2018 (45 comments)
When Star Trek’s Spock Met PLATO - https://news.ycombinator.com/item?id=16019201 - Dec 2017 (1 comment)
The Internet That Wasn’t: Review of “The Friendly Orange Glow” by Brian Dear - https://news.ycombinator.com/item?id=15784052 - Nov 2017 (24 comments)
The Friendly Orange Glow: The Untold Story of the PLATO System - https://news.ycombinator.com/item?id=15747924 - Nov 2017 (1 comment)
The Greatest Computer Network You’ve Never Heard of (PLATO) - https://news.ycombinator.com/item?id=15703024 - Nov 2017 (3 comments)
Performing History on PLATO: A Response to a Recent SIGCIS Presentation - https://news.ycombinator.com/item?id=15542999 - Oct 2017 (1 comment)
Want to see gaming’s past and future? Dive into the “educational” world of PLATO - https://news.ycombinator.com/item?id=12957552 - Nov 2016 (7 comments)
Ars Technica on the history of PLATO games - https://news.ycombinator.com/item?id=12827672 - Oct 2016 (1 comment)
PLATO (computer system) - https://news.ycombinator.com/item?id=6666430 - Nov 2013 (23 comments)