I remember the PET. I saw some at the computer club I went to in the early 80s along with various other machines. They were mostly incompatible with each other.

We take lots of memory and a fast CPU for granted these days, but you had to code efficiently in those days. I saw someone give a talk on programming the Atari VCS that was really under-powered. You had to be really clever to get a playable game running.

I did mostly BASIC on my Beeb, but tried some assembler.