From https://news.ycombinator.com/item?id=7878679#7880362 https://news.ycombinator.com/item?id=7878679#7880362: > Genera on the Lisp Machine runs on the metal.

From https://news.ycombinator.com/item?id=7878679#7880362 https://news.ycombinator.com/item?id=7878679#7880362: > Genera on the Lisp Machine runs on the metal. [...] the network packets are Lisp arrays, ... Not a perfect system, but an interesting one.