I have a Praecis CT CDMA clock connected to my xServe via the serial port: http://www.endruntechnologies.com/network-time-source.htm The xServe, a G4 model, is running Mac OS X Server 10.3.5. Any suggestions? I get these error messages in the syslog: I get these messages in the ntpd debugging output (among others): Regards, Sean _______________________________________________ darwin-development mailing list | darwin-development@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-development Do not post admin requests to the list. They will be ignored. I am able to connect to the clock and see its output successfully by using ZTerm and pointing it to the /dev/tty.serial device, but I am having trouble getting NTP to recognize the device. The NTP version I'm using is 4.2.0 with TRUETIME and ATOM enabled. I made a symlink from /dev/true0 to /dev/tty.serial and likewise for /dev/pps. I turned off remote connection in /System/Library/StartupItems/SerialTerminalSupport and rebooted. My /etc/ntp.conf has the line "server 127.127.5.0 prefer". Ordinarily, on my FreeBSD box, if I tell NTP to talk to 127.127.5.0, it should see /dev/true0, but it doesn't seem to happen on my OSX box. Aug 31 11:14:07 ltlp1 ntpd[7414]: ntpd 4.2.0@1.1161-r Fri Aug 27 15:59:43 PDT 2004 (7) Aug 31 11:14:07 ltlp1 ntpd[7414]: precision = 1.000 usec Aug 31 11:14:07 ltlp1 ntpd[7414]: frequency initialized 0.000 PPM from /etc/ntp.drift Aug 31 11:14:07 ltlp1 ntpd[7414]: fcntl(F_SETOWN) fails for clock I/O: Inappropriate ioctl for device Aug 31 11:14:07 ltlp1 ntpd[7414]: internal error: refclockio structure not found Aug 31 11:14:07 ltlp1 ntpd[7414]: configuration of 127.127.5.0 failed Aug 31 11:14:07 ltlp1 ntpd[7414]: frequency initialized 0.000 PPM from /etc/ntp.drift Aug 31 11:14:11 ltlp1 ntpd[7414]: ntpd exiting on signal 2 init_io: maxactivefd 12 local_clock: at 0 state 0 getnetnum given 127.127.5.0, got 127.127.5.0 key_expire: at 0 peer_clear: at 0 assoc ID 13916 refid INIT refclock_open: fd 14 modem status 0x6 refclock_ioctl: fd 14 flags 0x1 addto_syslog: fcntl(F_SETOWN) fails for clock I/O: Inappropriate ioctl for device addto_syslog: internal error: refclockio structure not found addto_syslog: configuration of 127.127.5.0 failed