One end of the electrolytic capacitor is connected to the reset circuit, and the other end is connected to EA. Please elaborate on what is going on. Is the reset circuit connected to EA at one end?

EA pin is the program memory selection pin, which is connected to high level: read the internal ROM first, and then search the external ROM. Your picture shows that the single chip microcomputer EA is connected to high level.

Has nothing to do with the reset circuit. The reset circuit in the figure is a high-level reset, which is connected to a 5V power supply.

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