Thanks all for your replies - I looked into errno - will be useful for future issues.
Thanks to Eric, found my problem was although Cygwin happy with using port labelled COM1 (and presumably picking up Windows settings thereof - hence their changing after Hyperterminal), it couldn't do the tcgetattr and tcsetattr for that port successfully. Using the correct POSIX labelled port of "/dev/ttyS0" allowed get and set to work perfectly in C! Thanks all! Andy Burgess -- __ __ __ __ __ ___ _____________________________________________ |__||__)/ __/ \|\ ||_ | / | || \\__/\__/| \||__ | /...Internet access for all Acorn RISC machines ___________________________/ [EMAIL PROTECTED] -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
