/dev/ttyS? v. /dev/cua?

["Oliver Elphick" <olly@lfix.co.uk>]

Following advice in messages in this list, I have changed my UUCP 
setup to use /dev/ttyS0 instead of /dev/cua0.

I now get an error message on terminating a cu session which I did not
see before:

ops% logout        << Log out from remote machine, which drops the line
cu: Got hangup signal
cu: Can't disable hardware flow control: I/O error
cu: write: I/O error

Does anyone know the reason for this?

Oliver Elphick                                      olly@enterprise.net
Isle of Wight                      http://homepages.enterprise.net/olly