Howard Brazee wrote:
On 21 May 2007 12:33:45 -0700, [EMAIL PROTECTED] (Andy Wood)
wrote:
The magnetron in my microwave oven cycles at a sub-nanosecond rate. That
does not mean it would be be suitable as a low drift clock source.
Personal computers have had built in clocks forever - but they have
been cheap and unreliable. The solution was to synchronize often. I
bought a program that did this calculating the lag in my modem and
phone line, but nowadays it is part of the OS.
First PCs wre sold without the clock. That's why MS-DOS asks for current date and time at startup (only when no autoexec.bat is present). Of course I mean battery-operated clock, working even if computer is powered off.
When the PC is up, the clock is present even in those veeeery old XT machines.
However the clock is inaccurate by design. The time is measured in "ticks".
There are 64k per hour. Due to round erors the time is always drifting.
--
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