Datapen
From CPCWiki - THE Amstrad CPC encyclopedia!
The Datapen is a light-pen from Datapen Microtechnology Ltd. The Datapen was also available for ZX Spectrum.
Unlike most other CPC light-pens it does include a button for working without keyboard. And, according to the advert it does calibrate itself to ambient light and works with dark screen colors.
Advert (ACU Dec 1985)
