Hi everyone, I want to understand the basic electronic circuit of an old motherboard. I need some guidance about ins and outs of this circuit, e.g. what feeds power into the CR2032 battery and how does it work.
The battery used to have to do with the BIOS settings. Nowadays indeed it does nothing much except run the clock. The BIOS settings are stored in the ROM itself. As a side note, that's why BIOS goes bad so often on modern boards.
Now coming back to the question asked, there is a double diode which feeds the CMOS memory. One side comes from the RTC battery, the other from a 3.3V source which is always present as long as the device is plugged in.
Originally posted by PeteS in CA
Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
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