The first computer I used was in high school an a PDP-8E with hand-threaded toroidal magnetic core memory - non-volatile - driving eight ASR-33 TeleTypes with tape reader/punches. I think total memory on this really basic system was 4K 12-bit words. For a virgin start, the bootstap loader had to be "toggled in" from the front panel, then the operating system and BASIC interpreter loaded via paper tape. It took a while and was pretty noisey.
At University, I used a PDP-11 quite a bit and loved the very flexible, high level structure of its machine code (source, destination, operation) that made programming in it almost an assembly language level task.
I still have an old 8-bit Altair 8800, Altair 680 and complete working IMSAI 8080/disk/videoterminal system in storage.
Brian - K6BRN