> If i understand correctly the PC sends a break when it [powers] up

It may be.  But I think more likely it's generating some other framing
error, which the host is treating the same way.

{\rant I really wish more people building systems like this would take
the trouble to distinguish between a break condition and other framing
errors.}  Not that that would help people with existing systems, which
don't make the distinction, any....

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