1. Yep IDEFix software works fine on the elbox interfaces
2. I think it works on the clockports, check the subway website out (forgotten url) theres a long list of machines its been tested on.
3. the A1200/A600 connectors are identical, I have used an A600 keyboard in an A1200 before.
Not to sure what you mean in your last question.
Hope that helps :-)