When my great grandma gave me an alarm clock I took it apart to see what was inside -and to play with those parts...
The best toys at my grandparents place were grandmas calculators (this was in an age before micro-processors and ICs so calculators were big mechanical things) and typewriters -not because I had a lot to calculate or write, just because I really
liked those machines
As I grew older and LEGO didn't do it all for me any more (was brilliant to build phasers and tricorders with when us suburban kids were playing "Enterprise" though) I started 'playing with' electronics; the transistor (and later: ICs) were brilliant toys
Yeah, I'm one of those geeks that originally build their own very first computer themselves
There was no such thing as an OS in those days though.