I remember their Coherent UNIX-like OS for PCs that they were selling for $99 in the early 1990s which was mentioned in the article. It came with an excellent p

I remember their Coherent UNIX-like OS for PCs that they were selling for $99 in the early 1990s which was mentioned in the article. It came with an excellent paper manual which was like a thousand pages. If it had come out five years earlier than it did it would have been a huge success. But in the early 1990s it soon faced competition from Linux and the various BSDs.