22 lines
1.1 KiB
Text
22 lines
1.1 KiB
Text
This port provides the pcfdate utility which reads the time of day from a
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pcfclock device, writes it to stdout or, optionally, sets the system time.
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You can benefit from pcfdate in case that
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- your geographic location is in Central Europe within a radius of roughly
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1500 km from the DCF77 transmitter near Frankfurt/Main, Germany,
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- you have the Conrad parallel port radio clock attached to your machine,
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- you have the pcfclock device driver enabled in your kernel configuration.
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The primary use of pcfdate is to initialize the system time on boot. In its
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normal operation the Conrad clock synchronizes with the transmitter once a
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day, and the time of day displayed refers to its internal quartz clock which,
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however, suffers from a considerable drift. The resulting accumulated error
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can reach about 0.6 sec after 24 hours. Combined with the clockspeed port
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this can still be considered a useful initialization: sntpclock can later be
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used to gradually adjust the system time with the global network time very
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effectively within a few minutes.
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WWW: http://www-stud.ims.uni-stuttgart.de/~voegelas/pcf.html
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