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+Notes for NTP Version 3
+
+This version operates in much the same manner as Version 2 with the
+following changes and additions:
+
+1.   The protocol machinery operates in conformance with the RFC1305 NTP
+     Version 3 specification. The most visible characteristic of this
+     version is that the poll intervals for all polls, even selected
+     ones, is significantly increased. This is especially desirable when
+     serving a large client population. This implementation supports
+     previous versions as non-configured peers; for version-2 configured
+     peers a "version 2" keyword should be included on the "peer" line.
+
+2.   The configuration file has a new keyword: statfile <file>, where
+     <file> is the name of a statistics file." When present, each clock
+     update generates an entry of the form:
+
+     <day> <sec>.<frac> <addr> <status> <offset> <delay> <disp>
+
+     where <day> is the modified Julian day, <sec>.<frac> is the time of
+     day, <addr> is the peer address and <status> is the peer status.
+     The <offset>, <delay> and <disp> are the measured offset, delay and
+     dispersion, respectively, of the peer clock relative to the local
+     clock. About once per day the current file is closed and a new one
+     created with names <file>.<gen>, where <gen> starts at one and
+     increments for each new generation.
+
+3.   A number of additional platforms are supported. See ./Config file
+     for details.
+
+4.   A driver for the TrueTime 468DC GOES Synchronized Clock is
+     included. This driver (refclock_goes.c) should also work for other
+     TrueTime radio clocks, since all use the same format.
+
+5.   A replacement driver for the Spectracom 8170 WWVB Synchronized
+     Clock is included. This driver (refclock_wwvb.c) (a) does not
+     require a 1-pulse-per-second signal, (b) supports both format 0
+     (original 8170) and format 2 (Netclock/2 and upgraded 8170), (c)
+     can be connected to more than one computer and (d) automatically
+     compensates for all serial baud rates.
+
+6.   A driver for the German time/frequency station DCF77 is included.
+     This requires a special STREAMS module.
+
+7.   In Version 2 special line-discipline modules were required for the
+     CHU and WWVB drivers. This code continues to work in Version 3,
+     although it is no longer needed for the WWVB driver. However, this
+     code does not work under STREAMS, as used in SunOS 4.1.1.
+     Equivalent STREAMS modules are supplied with Version 3.
+
+8.   Support for an external 1-pulse-per-second (pps) signal is
+     provided. The signal is connected to a serial port (see
+     xntpd/ntp_loopfilter.c for details). When present the leading edge
+     of the pulse establishes the on-time epoch within an interval
+     established by the selected radio clock or other NTP time server.
+     Use of the pps is indicated when the tattletale displayed by ntpq
+     changes from "*" to "o".
+
+9.   The clock-selection and poll-update procedures have been modified
+     slightly in order to achieve better performance on high speed LANs
+     with compromise in performance on typical WANs.
+
+10.  In order to comply with U.S. Commerce Department regulations, the DES
+     encryption routine lib/authdes.c cannot be exported. For exportable
+     versions of this distribution a DES-encrypted version of this routine
+     lib/authdes.c.des is included along with an unencrypted version
+     lib/authdes.c.export, which allows normal operation, but without the
+     NTP authentication feature. Further information is available in the
+     lib/authdes.c.export file.
+
+11.  As an alternative to the DES-based authentication mechanism, an
+     implementation of the RSA Message Digest 5 algorithm is provided.
+     (see applicable copyright information in the library files).
+
+12.  A driver for the Magnavox MX4200 GPS clock.
+
+13.  A STREAMS module which captures carrier-detect data-lead transitions to
+     connect a precision source of 1-pps, yet avoid the ugly overhead in the
+     usual STREAMS processing. See the ppsclock subdirectory.
+
+14.  Support for the Apple A/UX operating system and enhanced support for the
+     Hewlet-Packard HP/UX operating system. See the various README and Config
+     files for further information. 
+
+See the COPYRIGHT file for authors and copyright information. Note that some
+modules in this distribution contain copyright information that supersedes
+the copyright information in that file.
+
+If I missed something or neglected to give due credit, please advise.
+
+David L. Mills
+University of Delaware
+31 May 1992, amended 23 July 1992, 25 October 1992
+
+Bugs and notes
+
+A bug in the original tty_clk_STREAMS.c module has been fixed.
+
+The poll-interval randomization feature of poll_update (in
+xntpd/ntp_proto.c) has been extended to apply when the poll interval is
+increased, as well as reduced. This spreads the update messages in time
+and helps avoid unpleasant bursts of messages.
+
+In the clock_select algorithm the peers selected for combining are
+limited to those survivors at the lowest stratum, not the entire list.
+This helps avoid whiplash when large numbers of peers are at the same
+stratum.
+
+The number formerly displayed by ntpq as "compliance" is now the time
+constant of integration.
+
+The DNS resolver xntpd/ntp_intres.c is now integrated into xntpd, making
+configuration of multiple hosts easier.
+
+System and peer event are now written to the system log at priority
+LOG_INFO.
+
+The leap-second code was fixed to avoid broadcasting leap warnings on
+all except the last day of June and December.