> > serial - 1 unit
> > PS/2  - 5 units
> > USB  - 200+ units
> All of the dead ends I have been running into made me suspect this.  But
> the Microsoft Intellimouse, looking through a relay lens is real good a
> tracking concrete.  I will turn my efforts to extracting the tracking
> signal from the mouse before if gets to the USB interface chip.

The Intellimouse is also available with PS-2 interface.  I'm using one right
now.

Bob is right, doing a USB root controller is ***not trivial***.  All the low
cost USB chips are meant for end devices.  Implementing a root controller
requires a *lot* of software.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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