I've uploaded a screen address calculator if given X,Y coordinates. It's at;

http://www.retrosoftware.co.uk/wiki/ind ... en_Address

The page includes some code for testing it too.

Please feel free to edit if you see any optimisations.

I've added a manual page to the Wiki to aid people who just want to drag and drop the code into their own project without bothering to understand the code. I'll be adding these manual sections to all my source code Wiki pages in due course.