My oldest computer is an altair (original home computer available).
I have fully functional trs 80 model 1's, 2's, 3's and 4's.

The model 2 aka Model II has 4 8inch floppy drives a daisywheel printer. My first hard drive was 5mb.

All of NCR's home/small business machines.
hp kit machines (those were fun back in the day)
Tons of pocket computers from the early 80's. Glorified calculators by todays standards but they do run basic at least.

Im lucky enough to be old enough that I have had and had access to computers since the beginning of it all home computer wise. Pretty decent museum worth of them even today. I get kids today wanting me to "teach" them but I cant explain to them why they cant learn all I did because everything was new as it came out back then. The most they can hope for now is just to learn whats out now. Today's techs know how to fix stuff but they dont know how any of it actually works