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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H4>By James T. Dennis,
<a href="mailto:answerguy@ssc.com">answerguy@ssc.com</a><BR>
LinuxCare,
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
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>Null Modems: Connecting MS-DOS to Linux as a Serial Terminal</H3>
<p><strong>From phax on Mon, 31 May 1999
</strong></p>
<!-- ::
Null Modems: Connecting MS-DOS to Linux as a Serial Terminal
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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<P><STRONG>
Would the terminal program start the null modem connection or
would you have to have it be connected before hand through DOS
(I don't know a whole lot about DOS)? I know Linux will be
looking for a terminal on <tt>ttyS0</tt> but will a terminal emulator
show up as a terminal connected on that port?
Sorry to be such a nag,
</STRONG></P>
<P><STRONG>
Richard Mills
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Linux will look for terminal connections on
a line (<TT>/dev/ttyS0</TT>, <TT>/dev/ttyS1</TT>, whatever) if it
it has a "<tt>getty</tt>" process running on that port.
</BLOCKQUOTE>
<BLOCKQUOTE>
You set up a getty process by modifying your <TT>/etc/inittab</TT>
and adding a line like:
</BLOCKQUOTE>
<blockquote><pre>d1:23:respawn:/sbin/agetty -L 38400,19200,9600,2400,1200 ttyS1 vt100
</pre></blockquote>
<BLOCKQUOTE>
... where you can use <tt>agetty</tt>, <tt>uugetty</tt>, <tt>mgetty</tt>, or
<tt>getty_ps</tt> (but not <tt>mingetty</tt>). The syntax and additional
configuration of each of these other getty packages differs slightly.
Search through old issues of the Answer Guy for more
detailed explanations and examples.
</BLOCKQUOTE>
<BLOCKQUOTE><em>[ Issues 16, 17, 18, 21, 22, and 23 mention getty, and more
recently, issues 34 and 37 describe using X over serial lines.
-- Heather ]
</em></BLOCKQUOTE>
<BLOCKQUOTE>
As far as the DOS side of this, you generally just have to
start up your terminal emulation package and configure it
for "direct" or "null-modem" use.
</BLOCKQUOTE>
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