cmos电池_为什么PC依靠电力运行仍需要CMOS电池？

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cmos电池

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With all the progress and improvements that have been made with computer hardware, why are some things like the CMOS battery still necessary? Today’s SuperUser Q&A post has the answer to a curious reader’s question.

随着计算机硬件的所有进步和改进，为什么仍需要像CMOS电池这样的东西？今天的“超级用户问答”帖子回答了一个好奇的读者的问题。

Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites.

今天的“问答”环节由SuperUser提供，它是Stack Exchange的一个分支，该社区是由社区驱动的Q＆A网站分组。

Photo courtesy of Jim Bauer (Flickr).

图片由Jim Bauer(Flickr)提供。

问题 (The Question)

SuperUser reader Joseph Philipson wants to know why PCs still require a CMOS battery:

超级用户读者Joseph Philipson想知道为什么PC仍然需要CMOS电池：

Why do PCs still require a CMOS battery even though they run on electricity? We are providing lots of power to the PC by switching the CPU plug to our electric board, so why does it still require a CMOS battery?

为什么PC即使依靠电仍需要CMOS电池？通过将CPU插头切换到我们的电路板上，我们可以为PC提供大量电源，那么为什么它仍需要CMOS电池？

Why do PCs still require a CMOS battery?

为什么PC仍需要CMOS电池？

答案 (The Answer)

SuperUser contributors nhinkle and smokes2345 have the answer for us. First up, nhinkle:

超级用户贡献者nhinkle和smokes2345为我们提供了答案。首先，nhinkle：

The CMOS battery is not there to provide power to the computer when it is in operation, it is there to maintain a small amount of power to the CMOS when the computer is powered off and unplugged.

CMOS电池在运行时不提供电源给计算机，而在计算机断电并拔下电源时却可以为CMOS供电。

The primary function of this is to keep the clock running even when the computer is turned off. Without the CMOS battery, you would need to reset the clock every time you turned on the computer.

其主要功能是即使关闭计算机也可以保持时钟运行。如果没有CMOS电池，则每次打开计算机时都需要重置时钟。

On older systems the CMOS battery also provided the small amount of charge required to maintain the non-volatile BIOS memory, which remembered BIOS settings between reboots. On modern systems this information is typically stored in flash memory and does not require a charge to be maintained.

在较旧的系统上，CMOS电池还提供了维护非易失性BIOS内存所需的少量电荷，该内存可记住重启后的BIOS设置。在现代系统上，此信息通常存储在闪存中，不需要维护费用。

Followed by the answer from smokes2345:

接下来是smokes2345的回答：

Think of it like your car battery. When you unplug the battery, your radio looses all of its presets and the clock resets. Originally, the CMOS battery held a similar function, maintaining the memory that held the BIOS settings and keeping the Real-Time Clock running.

可以将其视为您的汽车电池。拔下电池时，收音机将失去其所有预设，并且时钟会重置。最初，CMOS电池具有类似的功能，即保留用于保存BIOS设置的内存并保持实时时钟运行。

However, with modern computers the CMOS battery plays a lesser role as most BIOS firmware is smart enough to automatically detect the correct settings and those settings are stored such that they do not need power to persist. The CMOS battery is still required to maintain the RTC though.

但是，在现代计算机中，CMOS电池的作用较小，因为大多数BIOS固件足够智能，可以自动检测正确的设置，并且存储了这些设置，因此它们不需要电源即可持久。尽管如此，仍然需要CMOS电池来维持RTC。

More information is available at the following Wikipedia page: Nonvolatile BIOS Memory (CMOS Battery)

可在以下Wikipedia页面上获得更多信息：非易失性BIOS内存(CMOS电池)

Have something to add to the explanation? Sound off in the comments. Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here.

有什么补充说明吗？在评论中听起来不错。是否想从其他精通Stack Exchange的用户那里获得更多答案？在此处查看完整的讨论线程。