[Coco] The Power Sword info

[Charlie]

Hello list.

I'm looking for some information on a basic game called The Power Sword by David Dawson.
This game is one of my all time favorites for the coco. 

I think it came from Rainbow Magazine? If so, would anyone know what month / year and where I can grab this issue.
I'd love to read the article that goes along with the game. I'm sure I did as a kid but my family threw away all my Rainbow Mags years ago.
Here is a (bad) picture of the game on my coco.

http://flic.kr/p/dTnp5j

Thank you.

Charlie