Here are some of the early computers I dealt with. #1 at Stevens Tech, the Univac 1105; a big room full of 12AX7s!
In my early days at AT&T, the Datapoint 2200. A discrete component version of the Intel 8008! Ours had a 9-track tape drive!
Later at AT&T, the TRS-80
And of course, I had one of these at home:
I saw somewhere online that someone has an Arduino based version of it; even looks the same!
John - WA2FZW