Solo Cube motor PWM output / schematic question:

[VCD]

Does the motor PWM output om the cobe come directly from microcontroller, (source/sink ~20mA)
or a buffer IC ? and if so, what's it's current capability ? - limited at 20-30mA or more ?

 

[VCD]

...there is a resistor somewhere between PWM output from the cube, and the ESC. are there schematics for the mainboard ?

 

[VCD]

the resistor is on the cube...