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Delved into this a bit, and found some claims that there's no PPP driver for A/UX, so I guess there's the answer. I know about NetBSD. However, in my somewhat irrational mind, it lacks the cool factor of A/UX, the spiritual stepfather of Mac OS X (the biological one being NeXTStep, obviously).

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The PPP protocol isn't very complicated, how easy it would be to add to a binary-only UNIX is another question. You could have a look for whether the A/UX network stack is from BSD or System V. One thing that would make a big difference is whether it supports STREAMS [1].

[1] https://en.wikipedia.org/wiki/STREAMS

A few minutes of googling make it look like SLIP and PPP solutions exist for A/UX.

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