(2) There are accidents of history. When DEC decided to discontinue the PDP-10, the days of the hacker community built around it were numbered. Those involved t

(2) There are accidents of history. When DEC decided to discontinue the PDP-10, the days of the hacker community built around it were numbered. Those involved then went on to build Lisp machines... Nit on this bit of history: the PDP-6/10/Decsystem 20 architecture was a dead end due to its maximum address space of 1 MiB (of 9 bit bytes), but was still a very healthy line of computers when the Lisp Machine effort started circa 1974, about a decade before DEC dumped the whole line, then a 100 million a year business (a lot of us looked at that and decided DEC's business sense was so poor we weren't going to invest any more then we could in their systems, which of course turned out to be absolutely right).