[hga]

Note that according to BLS's CPI, that's $192,000 in 2016 dollars.

Still, it was an amazing achievement for nonetheless relatively affordable PDP-11/45, on which it was eminently usable, and in many ways better than anything else out there aside from it's Multics forefather.

(Originally ran on a first generation PDP-11, later the 11/20, with an extra memory unit so it could run split Instruction and Data (I&D) and have decent budgets for both; on the 11/45, that would be up to 64KiB code, 56KiB data, and 8KiB stack.)