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Previously, the TX pin would be set to output first and then written high (assuming non-inverted logic). When the pin was previously configured for input without pullup (which is normal reset state), this results in driving the pin low for a short when initializing. This could accidenttally be seen as a stop bit by the receiving side. By first writing HIGH and then setting the mode to OUTPUT, the pin will have its pullup enabled for a short while, which is harmless.
Arduino
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Arduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP). The boards can be assembled by hand or purchased preassembled; the open-source IDE can be downloaded for free.
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For more information, see the website at: http://www.arduino.cc/ or the forums at: http://arduino.cc/forum/
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To report a bug in the software or to request a simple enhancement go to: http://github.com/arduino/Arduino/issues
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More complex requests and technical discussion should go on the Arduino Developers mailing list: https://groups.google.com/a/arduino.cc/forum/#!forum/developers
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If you're interested in modifying or extending the Arduino software, we strongly suggest discussing your ideas on the Developers mailing list before starting to work on them. That way you can coordinate with the Arduino Team and others, giving your work a higher chance of being integrated into the official release https://groups.google.com/a/arduino.cc/forum/#!forum/developers
Installation
Detailed instructions are in reference/Guide_Windows.html and reference/Guide_MacOSX.html. For Linux, see the Arduino playground: http://www.arduino.cc/playground/Learning/Linux
Credits
Arduino is an open source project, supported by many.
The Arduino team is composed of Massimo Banzi, David Cuartielles, Tom Igoe, Gianluca Martino, Daniela Antonietti, and David A. Mellis.
Arduino uses the GNU avr-gcc toolchain, avrdude, avr-libc, and code from Processing and Wiring.
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