I thought the CrossPad worked similar to large digitizing tablets used
for  a lot of CAD work. I think they have a grid of wires in the tablet
that detects the electro magnetic field given off by the
pen/stylus/puck. I'm not sure how they then detect the actual position.
Perhaps it's just a really sensitive detector that can tell which wire
the source is closest to. Do it once for X, once for Y, and you know
where you are. I'm not really sure though.

Just a thought,

Josh
joshy@mb.sympatico.ca

Randy Glenn wrote:
>
> Before I begin, I'd like to thank all those who offered me advice with my
> university question. The information that you all offered me was very
> valuable. Thanks again.
>
> Has anyone heard of the CrossPad? It was a product from Cross, the pen
> company, that IBM was a major part of. It was basically a regular pad of
> paper with a radio receiver of some sort, and a radio transmitter in a
> special pen, that would digitize a good number of pages of written
> information.
>
> Many sources online say that then pen transmits "Pen stroke information"
> wirelessly, but how would the pen know its absolute position relative to the
> page? I'm thinking that there's some sort of triangulation going on here
> with signal strength.
>
> Does anyone have any idea as to where I can find a more in-depth discussion
> as to how this thing really works? I think it's really interesting, and
> would probably be even more interesting to try and duplicate.
>
> -Randy Glenn
>
> New record for time between Windows reinstalls: 4 months.
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