Bit lost by what you said, there is no where on the A1200 mobo for you to plug the indivision 10 way IDC lead in.
He has been working on moding his A1200 for ages. His posts are always very hard to understand as I assume english not his first language. From what he says and from his other work I am inferring that he has put a vga header somehow on the A1200 mobo which somehow displays either bvision or scan doubler.