[Coco] Spectrum Light Pen (was: Diecom light gun adapter)

[Al Hartman]

When I worked at Zebra Systems, we used to make the Spectrum Light Pens for 
Bob Rosen which were simply a photo detector mounted into a magic marker 
body.

I can't find anything on Rainbow with a programming example. So I can't say 
if the pen was attached to a button or the x/y axis for reading.

It was amazingly simple, and I must have built over 100 of them.

-[ Al ]-