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165 lines
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<TITLE>The Answer Guy 37: Using "odd" modem settings</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<font color="#B03060">The Answer Guy</font>
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<BR>
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<H4>By James T. Dennis,
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<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a><BR>
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Starshine Technical Services,
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<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
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height="50" width="60" alt="(?) " border="0"
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>Using "odd" modem settings</H3>
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<p><strong>From rdefoe@reichert.com on Fri, 08 Jan 1999
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</strong></p>
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<!-- ::
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Using "odd" modem settings
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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:: -->
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<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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>
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I am trying to use diald to connect to compuserve.
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Compuserve requires that the port settings be set at 7 bits - Even Parity
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before the login and then set back to 8 bits with no parity after sending
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the password.
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</STRONG></P>
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<P><STRONG>
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I can't seem to find a way to do this with chat. What am I missing?
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</STRONG></P>
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<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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>
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Terminal line settings are normally controlled
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with 'stty' using commands like:
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</BLOCKQUOTE>
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<BLOCKQUOTE><BLOCKQUOTE><CODE>
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stty -parodd parenb cs7 < <TT>/dev/ttyS?</TT>
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</CODE></BLOCKQUOTE></BLOCKQUOTE>
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<BLOCKQUOTE>
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... not the redirection <EM>from</EM> the modem serial device node
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not <EM>to</EM> it. That's a quirk of this command; it works
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by issuing ioctl()'s on it's input file descriptor.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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Just offhand I don't know how to invoke stty during
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'chat' --- it might not be possible. In the worst case
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you might have to hack together your own version of 'chat'
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to add a command or two (which could then invoke the
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appropriate 'stty' command through a system() call --- or
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could incorporate some of the 'stty' sources directly.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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I'm not enough of a programmer to do this in a reasonable
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time --- but it's a possibility.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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Did you do a Yahoo! and Alta Vista search on the
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phrase "+Linux +CompuServe"? Is anyone else using Linux
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to access their CompuServe accounts?
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</BLOCKQUOTE>
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<P> <hr> <P>
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<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
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>Copyright ©</a> 1999, James T. Dennis
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<BR>Published in <I>The Linux Gazette</I> Issue 37 February 1999</H5>
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