Even Japan is switching away from TRON to Linux. TRON is really limited. Made sense for controlling hardware in the 80s & 90s, but it lacks most of the abstractions expected in a system today. I've developed for it.
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"China already has the most advanced and extensive high-speed rail lines in the world."
No, it doesn't.
You probably noticed what was more foreign to you.
I live in Tokyo for about 4 years, and in my 30 min daily communte I see at least 20 iPhones everyday (I avoid crowded trains, so that's no small number). There's so many young people with iPhones here. It's true that many of those, specially the Japanese, also have some other Japanese cell phone to deal with the "Galapagos" system that is the Japanese.
As people said above, it's true that it's 46% of the smartphone market, which is not big here. But the iPhone is actually doing quite well. There are so many companies and individuals developing Japanese apps (many to make them more compatible with the "Galapagos" system, that's also true).
I hear a lot of people in America complaining about the iPhone and AT&T. Now imagine you could have an iPhone in a 3G only network with high-coverage. That's Japan.
We've had single Atom CPUs for some years now...
I believe Santa Cruz Operation is not supported.