Zero-wire serial auto-reset for Arduino

Various versions of the Arduino will reset the board by toggling the serial DTR line, a feature called auto-reset.  Since it relies on the DTR line, it won't work with TTL serial adapters that don't break out the DTR line.  After writing my half-duplex serial UART, I thought of using the TTL serial break signal which holds the line at 0V for several ms.  Normal serial communications would also send 0V, but ...

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