Thanks Adder it was 833 method.

That was a massive help pulled the screen in nice and easy with vsiz and v cen so it's as good as I can get it. However Donkey kong and 1943 are still missing top and bottom of picture so I guess I'm back over to the Groovymame forum to change it with software? not ideal but most of the games I'm going to play are horizontal I only have about 3 games that are vertical So I don't mind compromising on them.
Thanks so much guys I was starting to pull my hair out, I hope this will all be worth it soon