Awesome - 1531 mouse. Is the speed of the mouse the same as compared to an Amiga 500 mouse operating in Workbench?
Since the mouse operates in joystick mode, there is no proportional movement. i.e. the software cannot detect how fast you are moving the mouse pointer across the screen, only in which direction you are moving the pointer.
So the speed of the mouse is fixed, and can be set in software.
It's not as nice as a real proportional mouse (try moving your mouse pointer with the amiga keyboard shortcuts to get the feeling).
The 1530 mouse also works this way.