After 'graduating' from the GPIO 8 module, I notice there are no built in pull up resistors 'on board' the 16 input version. Is there a command that can be issued to option them in the circuit, or perhaps a jumper I am missing that will do same? Just for reference, the GPIO 8 module had small solder 'pads' allowing the inclusion of the 10k pull-up resistor for each input. Optionally, I notice this is a 3.3v system, and if I have to place my own external resistors, where can I safely tap a 3.3v source to supply said resistors? Many thanks.