They were initially in SPI Mode. For I2C some soldering has to be done: Move resistor R3 to R1 and bridge R8.
Two IO Pins are sufficient, if Res Pin goes with 100nF to ground and with 10k Resistor to 3.3V.
DC, CS are on ground.
With Micropython on a Wemos d1 mini:
There is only one small font usable in micropython so I used the very good Adafruit_SSD1306 lib:
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