Lobsters retrocomputing - 21 Aug 2026

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Unsurprisingly, the ambitious and politically targeted desktop variant failed. But it was the embedded variant nobody in the West paid attention to that managed to succeed to the point of becoming an important building block of day-to-day infrastructure. The same project produced what could well be the world's most-used operating system and an operating system that failed entirely, and it was the project that everyone was paying attention to that actually failed. You can still buy a BTRON implementation today if you know where to look, since Personal Media Corporation's website is still up and still selling Cho-Kanji, in Japanese only. The project's lasting mark on computing is invisible, though, running in the devices around you that you never think about as having an operating system at all.

Sakamura received the Takeda Prize jointly with Linus Torvalds and Richard Stallman, for spreading open architecture worldwide. After all, the same open approach that made TRON vulnerable in a trade dispute, the assumption that being open was protection enough, is what let ITRON spread without friction afterwards. Sakamura's apology, though, arrived after the damage had been done over dinner in 1989. The industry had already abandoned the project by that stage.

BTRON's hypermedia ideas are being rediscovered by a new generation of tools that don't know they're recreating a 40-year-old design. The character encoding is archived and the CPU is a museum piece. But the real-time kernel that nobody seemed to think of as an important piece of the puzzle still runs in places you'd never guess, and it's hard to think of a better legacy than that.

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Original: https://www.xda-developers.com/japan-tried-build-operating-system-entire-world-us-government-intervened/