If any one wants to create a mechanical keyboard and use the controller board of the logitech k120 , there are some extra keys on the keymap that are not present on the actual keyboard but was present in the matrix , like the shortcut keys and the volume up and down keys , as well as the power and sleep keys.
Hey i was mapping out my broken keyboard :) to try and making a mechanical keyboard. But the pin out makes it hard to design a pcb