In the early 90ies, we used to have pocket electronic chess games. I used to have myself one that was about the size of a pocket calculator (it actually was also a pocket calculator), which included a tiny board with tiny, tiny chess pieces. Not a strong opponent and quite slow, but good enough for casual games on the road.

I doubt you could fit that JSON file in its NVRAM. Sometimes I wonder how much sooner we could have had what smartphones offer us today if some technical choices had been made more... wisely.

But that's the endless conundrum Worse is better [1].

[1] https://dreamsongs.com/RiseOfWorseIsBetter.html