By chance I came across a Dart Light Pen. Does anyone have software for this?
I made some photos and uploaded them in the wiki:
http://www.cpcwiki.eu/index.php/Dart_Light_Pen
Oh... I was given one of those when I was a kid. Sadly I don´t remember the name of the software I used with it. What I remember quite clearly is that, after many tries, I ended using my keyboard, as always. The pen was never very accurate :D
They usually are not very accurate, that is due to the hardware.
Good software scans 3 times (or takes some scans out of a time window, depending of vicinity of values) and middle the x and y position out.
That kind of pens can be fun with the right software though...