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maruk2@hotmail.com
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 Posted: Tue May 15, 2007 2:08 am Post subject: Any way to upgrade CMOS clock?? |
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As the starting point, assume a PC with Intel Core-2 6300
at 1.86GHz, 32-bit Vista
The CMOS clock (is it still called CMOS clock?) drifts about
2 secs/day on my machine. Is there any way to replace it
with a much more precise clock? Are there any expansion
cards available with high quality clocks to replace
the default CMOS clock. I do not want the drift to
exceed 1 second/week.
Please do not bring up the synchronization issue with
Internet servers. I want to synchronize only once/week
at the most and not every day. |
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Guest
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| Posted: Tue May 15, 2007 2:08 am Post subject: Re: Any way to upgrade CMOS clock?? |
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<maruk2@hotmail.com> wrote in message news:1179186845.026503.203460@e65g2000hsc.googlegroups.com...
| Quote: | As the starting point, assume a PC with Intel Core-2 6300
at 1.86GHz, 32-bit Vista
The CMOS clock (is it still called CMOS clock?) drifts about
2 secs/day on my machine.
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That's very accurate as motherboard clocks go. Consider yourself
lucky.
There's no way to replace a clock on a modern motherboard. If
you don't mind paying way too much for a clock card:
http://www.beaglesoft.com/clcahome.htm |
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Franc Zabkar
Guest
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| Posted: Tue May 15, 2007 11:50 am Post subject: Re: Any way to upgrade CMOS clock?? |
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On 14 May 2007 16:54:05 -0700, "maruk2@hotmail.com"
<maruk2@hotmail.com> put finger to keyboard and composed:
| Quote: | As the starting point, assume a PC with Intel Core-2 6300
at 1.86GHz, 32-bit Vista
The CMOS clock (is it still called CMOS clock?) drifts about
2 secs/day on my machine. Is there any way to replace it
with a much more precise clock?
|
You could add trimmer capacitors to the 32.768kHz and 14.31818MHz
crystals. The original IBM AT had a trimmer cap for the latter.
| Quote: | Are there any expansion
cards available with high quality clocks to replace
the default CMOS clock. I do not want the drift to
exceed 1 second/week.
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AIUI, the RTC/CMOS RAM chip provides the initial hardware time
reference using the 32.768kHz crystal. After bootup, the 14MHz crystal
takes over and provides the reference for a "software" clock.
| Quote: | Please do not bring up the synchronization issue with
Internet servers. I want to synchronize only once/week
at the most and not every day.
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If you are losing time after synchronising with an Internet time
server, then I'd suspect that the 14MHz crystal needs trimming.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email. |
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