This story was discussed a few days ago¹, including with some fond personal recollections from users. There was a link posted to Vint Cerf's story collection² too. Also, a link to the source of Mills' fuzzball OS was posted³.
¹ https://news.ycombinator.com/item?id=39051246
² https://news.ycombinator.com/item?id=39063732
³ https://news.ycombinator.com/item?id=39052051