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Terminal “0” drives the cathode “0” and so on.
Some of the components are mounted on the back of the board! Q7, Q8, R26 and R27 are on the reverse side of the board:
If you install the RTC instead of the the WiFi circuit, there is no reason to install the WiFi circuitry.
Cathode “0” is next to the tiny “o” printed on the board next to the connector.