The 7.82 motherboard is fully functionally compatible with the 7.81

The pinout of the lamellae is compatible from 1 to 37.

lamella 38 (GND) additional ground

lamella 39 (K line) is raised from the bottom of the board to the common row 

Two connectors have also been added to the board, through which two additional displays can be connected, for example:

Location of the K-line contact on boards 7.81 and 7.82