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diff --git a/contrib/xntpd/README.FreeBSD b/contrib/xntpd/README.FreeBSD
index 437d4783d1ed..8fd237e1640c 100644
--- a/contrib/xntpd/README.FreeBSD
+++ b/contrib/xntpd/README.FreeBSD
@@ -1,6 +1,8 @@
+ $Id: README.FreeBSD,v 1.7 1994/04/21 21:10:20 wollman Exp $
+
This version of NTP was converted to the BSD-style Makefile system by
Garrett Wollman (wollman@freefall.cdrom.com); it is based on version
-3.3z (late beta) from the University of Delaware.
+3.3s (late beta) from the University of Delaware.
Besides the Makefile changes, the DES code has been completely removed
in order to make this code exportable. If you have a legal copy of
@@ -8,3 +10,75 @@ in order to make this code exportable. If you have a legal copy of
to the AUTHDEFS in Makefile.inc.
You can change CLOCKDEFS in the same file to add other reference clocks.
+
+This version of xntpd knows how to talk to the kernelized NTP PLL which is
+present in versions of FreeBSD-current after 21 April 1994. When this code
+is more widely released, I'll provide the patches to Mills.
+
+----------------------------------------------------
+Support for Conrad electronic's "DCF-77 Uhr, Mobil".
+----------------------------------------------------
+Conrad electronic in Germany,, Phone (+49) 962230111 (?), sells a gadget
+called "DCF77 Uhr, mobil", which is a DCF77 timecode receiver with a
+rs-232 interface. The price is around DM130.
+ 9-pin interface is Order# 97 94 57 66
+ 25-pin interface is Order# 97 94 81 66
+
+You must define
+ -DDCF77 -DPPS -DFREEBSD_CONRAD -DDEBUG
+when you compile xntpd. You can later remove -DDEBUG, if you feel like it.
+
+You must also have
+ options COM_BIDIR
+defined in your kernel, and finally the ttyport you intend to use must
+have special interrupt vector:
+ device sio1 at isa? port "IO_COM2" tty irq 3 vector siointrts
+ ^^^^^^^^^^^^
+connect the radio-clock to the tty port and link it to /dev/refclock-0:
+
+ cd /dev
+ sh MAKEDEV cua1
+ ln -s /dev/cua01 /dev/refclock-0
+
+make a directory to gather statistics in:
+ mkdir /var/tmp/ntp
+
+Create a /etc/ntp.conf along these lines:
+
+ # DCF77 without PPS
+ server 127.127.8.20
+ # DCF77 with PPS
+ #server 127.127.8.148 prefer
+
+ driftfile /var/tmp/ntp/ntp.drift
+ statsdir /var/tmp/ntp
+ statistics loopstats
+ statistics peerstats
+ statistics clockstats
+ filegen peerstats file peerstats type day enable
+ filegen loopstats file loopstats type day enable
+ filegen clockstats file clockstats type day enable
+
+Try to start it:
+ comcontrol ttyd1 bidir
+ tickadj -A
+ xntpd -d -d -d
+
+You should see the red LED flash on the receiver every second now. You
+may have to experiment a bit with the location, and possibly adjust the
+minute variable resistor inside to get a good signal. Be aware, that just
+because you see the light flash, is not the same as the signal being
+received by the computer. The chip doing the work in the reciver uses
+less than 1 micro-ampere, so even if RTS isn't pulled low, it will happily
+receive, but be unable to buffer the signal to the rs-232 levels needed.
+
+You can see what's going on in /var/log/messages, and query the
+daemon using xntpdc and ntpq, in particular the "clockvar" command
+of ntpq will tell about the clocks healt.
+
+I live in Slagelse, Denmark, which is ~1000 Km from Mainflingen, yet
+I have +/- 2 ms precision from this cheap gadget. If you have a very
+stable signal, you can use the 'pps' address instead to improve your
+timing.
+
+Have fun... Poul-Henning Kamp <phk@login.dkuug.dk>