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Multi-serial port protocol analysers
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http://www.gumbley.demon.co.uk/ncp.html
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Linux, freeware, originally developed for Psion communication analysis
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http://www.dunfield.com/dlm.htm
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Dos, commercial ($29.95) solution
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In system analysers (one serial port)
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ftp://metalab.unc.edu/pub/Linux/utils/terminal/ttysnoop-0.12c.tar.gz
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Linux, freeware, designed for terminal snooping, but can be used with
anything that communicates through STDIN/STDOUT/STDERR.
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http://www.sysinternals.com/portmon.htm
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Win95, freeware, designed for debugging port communications but can be
used for protocol analysis
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strace -x -ff -e trace=file,read,write,close -o
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linux, part of the main distribution. To be effective, it really needs
some kind of perl wrapper. But it's very general purpose.
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