I am trying to setup ppp on a Debian Linux box. I have an internal modem and it is set to com1. I followed the instructions on http://www.debian.org/fom/40.html to set up ppp but when I so what it says I get the following error message tcgetattr: I/O error. I noticed that there is no directory under dev called ttS0, should there be one. Is there a way to test that the modem is setup properly in Linux?