TOPS-20 --> UNIX

[Joe Kelsey]

You obviously missed the point completely - there is a WORLD of
difference between "Bottoms-10" and TOPS-20.  I wouldn't program on
"Bottoms-10" unless you really made it worth my while, although it is
an interesting dinosaur and also manages to support very large user
communities.  Quite simply, TOPS-20 provides the best environment for
everyone from novice to "hacker" that I have ever used.

/Joe Kelsey