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Originally Posted by Rickertsen2
As a side note, if your program crashes with the serial port open, there is no way to close it and make it available again other than restarting the computer. This is true in windows 2000. I assume it is true in other version as well. I share this because it caused me a day of frusteration thinking there was something wrong with my program.
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When I killed the cygwin version of picloader, it freed the serial port. (Windows XP.) Could be driver-specific, or a fixed bug.