There appears to be a bit more silkscreened text on the pcb that is covered by the wires in the pictures. Something before the word "Amitek".
I would think that the switch on the back might disable the floppy drive without having to remove it from your Amiga. There are, or were a few Amiga games that would refuse to run if a second/external floppy drive is connected to the Amiga.
The switch on the digital to analog Joystick converter might be for improving sensitivity or compatibility. I actually think I have one of those converters somewhere new in the box. I will try to find it and its documentation and let you know.
