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Even in embedded systems, there's still usually a distinct boundary between the OS kernel and the "application", and a well-defined API between the two.

• lloeki 6y ago
  There's an OS alright, it's just not a -general purpose- OS but a very small, statically embedded, specialised one.
• eru 6y ago
  Compare https://en.wikipedia.org/wiki/Unikernel https://en.wikipedia.org/wiki/Unikernel