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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<html>
+<head>
+<title>Conrad parallel port radio clock</title>
+</head>
+<body>
+
+<h3>Conrad parallel port radio clock</h3>
+<hr>
+
+<h4>Synopsis</h4>
+
+<p>Address: 127.127.35.<i>u</i><br>
+Reference ID: <tt>PCF</tt><br>
+Driver ID: <tt>PCF</tt><br>
+Parallel Port: <tt>/dev/pcfclocks/<i>u</i></tt> or <tt>/dev/pcfclock<i>u</i></tt>
+</p>
+
+<h4>Description</h4>
+
+<p>This driver supports the parallel port radio clock sold by
+<a href="http://www.conrad-electronic.com/">Conrad Electronic</a> under
+order numbers 967602 and 642002.  This clock is put between a parallel
+port and your printer.  It receives the legal German time, which is
+either CET or CEST, from the DCF77 transmitter and uses it to set its
+internal quartz clock.  The DCF77 transmitter is located near to
+Frankfurt/Main and covers a radius of more than 1500 kilometers.
+
+<p>The pcfclock device driver is required in order to use this
+reference clock driver. Currently device drivers for
+<a href="http://home.pages.de/~voegele/pcf.html">Linux</a> and
+<a href="http://schumann.cx/pcfclock/">FreeBSD</a> are available.</p>
+
+<p>This driver uses C library functions to convert the received
+timecode to UTC and thus requires that the local timezone be CET or
+CEST.  If your server is not located in Central Europe you have to set
+the environment variable TZ to CET before starting <tt>ntpd</tt>.
+</p>
+
+<h4>Monitor Data</h4>
+
+<p>Each timecode is written to the <tt>clockstats</tt> file in the format
+<tt>YYYY MM DD HH MI SS</tt>.</p>
+
+<h4>Fudge Factors</h4>
+
+<dl>
+<dt><tt>time1 <i>time</i></tt></dt>
+<dd>Specifies the time offset calibration factor, in seconds and fraction,
+with default 0.1725.</dd>
+
+<dt><tt>time2 <i>time</i></tt></dt>
+<dd>Not used by this driver.</dd>
+
+<dt><tt>stratum <i>number</i></tt></dt>
+<dd>Specifies the driver stratum, in decimal from 0 to 15, with default 0.
+</dd>
+
+<dt><tt>refid <i>string</i></tt></dt>
+<dd>Specifies the driver reference identifier, an ASCII string from one to
+four characters, with default <tt>PCF</tt>.</dd>
+
+<dt><tt>flag1 0 | 1</tt></dt>
+<dd>Not used by this driver.</dd>
+
+<dt><tt>flag2 0 | 1</tt></dt>
+<dd>If set to 1, the radio clock's synchronisation status bit is
+ignored, ie the timecode is used without a check.</dd>
+
+<dt><tt>flag3 0 | 1</tt></dt>
+<dd>Not used by this driver.</dd>
+
+<dt><tt>flag4 0 | 1</tt></dt>
+<dd>Not used by this driver.</dd>
+</dl>
+
+<hr>
+<address>Andreas Voegele &lt;voegelas@users.sourceforge.net&gt;</address>
+</body>
+</html>