That’s a scary thought… I think I must have acquired one of these when I was sixteen or so, that makes them about 20 years old now!
It came second hand from a friend of my Gran at work. The case came off with a nice satisfying “pop” noise. There were two slots in the back for expansion packs, of which I had a few.
Some were simple memory storage units (I had a 32kb one!!) and others had simple apps (like a Dictionary).
I do remember the OPL or Organiser Programming Language was quite powerful, and I’d programmed in a pac-man style game. Can’t remember where that came from now tho, or was it even built in? Not sure!