Every story and comment from the Hacker News API, in a layout borrowed from 2001.
A comment on Tetris-OS: An operating system that only plays Tetris. Parent comment
(You'd have them in userland. Whether you count that as part of the OS or not, is a different question.)
There are no comments on this comment yet.
(You'd have them in userland. Whether you count that as part of the OS or not, is a different question.)