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If you're running on Unix (and probably Win32 too, but I don't know much about it) then you can treat a serial line just like a regular file. On Linux, for example:
serial _ FileStream oldFileNamed: '/dev/ttyS0'. serial nextPutAll: 'Hello, serial device!; cr.
It may work but will have some disadvantages. You have to change the comm settings manually (using "stty" on Unix or "mode" on Dos/Win32). Also, using a semaphore for signaling incoming data is probably more convenient. But anyways, give it a try!
Andreas
squeak-dev@lists.squeakfoundation.org