$lsusb
ID 0a81:0205
Chesen Electronics Corp. PS/2 Keyboard+Louse Adapter
$ cd /dev/input
$ ls -la
Returns mouse0 and mouse1. This 0 or 1 index is very important when assigning controls. The thing is unplugging and re-plugging into usb can change these mouse #'s. Especially if we put into a different USB Port.
$cat /dev/input/mouse0
Trackball is now on mouse0 when booting with both Mice (spinner) plugged in