Mike S wrote:

If you do a bit of research, I think you'll find that the 32768 Hz input to the RTC clock isn't even exposed on most PCs. A battery supported RTC

It wasn't part of the PC architecture, but it was part of the PC AT architecture, and possibly of the PC XT. All modern Intel Architecture PCs are descendants of the AT. I've got the AT circuit diagram and can tell you the actual chip used, if you want.

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