After a while, we got one million (64-bit) "words" of Extended Core Storage (ECS).
That worked out to a whopping 8MB of high-speed (non-executable) storage!
With that configuration we designed reactors for the USS Enterprise, commercial Light-water breeder reactors and most of the Navy's nuclear submarines in use throughout the 70s and 80s.
We learned to write programs that were highly efficient, in terms of storage and execution speed.
(sniff) getting sentimental ...
It always amazes me how much crap modern operating system do rather than running user processes.
Mine was FORTRAN 4 (77?) on an HP9000, happily I moved on to C about a year later. C was (is) a great programming language. I like Java too but I always remember that "strong typing is for weak minds", lol, C let me get down and dirty with data stacks that would cause a Java compilers to self dis-struck.