Alex

Yes, I totally understand this. Thank you for such quick response. According to this [RUMBA32 pin scheme](https://github.com/makerbase-mks/MKS-RUMBA32/blob/master/hardware/MKS%20RUMBA32%20V1.0_002/MKS%20RUMBA32%20V1.0_002%20PIN.pdf) and this [RUMBA+ pin scheme](https://github.com/Aus3D/RUMBA-Plus/blob/master/Resources/Images/PinoutDrawing.png) pins definition is ok. As I can see...

Yes. Now I switched to fork from original MarlinFirmware here https://github.com/alex18881/Marlin/tree/2.0.x-rumba32. It has a Discount smart controller enabled instead of OLED - I'd commited it when tested if it works....

I'm not sure I correctly understand the question. But this screen works fine with the original Marlin on 8bit RUMBA and RAMPS. If you have this hardware you can check...

The interesting thing according to schematics in this repository and in the Aus3d's RUMBA+ exp1 and exp2 have absolutely the same pinout. All pins are the same.

In my research I came to the same conclusion. But there are several posts and articles in internet where people make oled displays to work on stm32 based mainboards (most...