@ CaptainHIT :
When I read your answer I thought WOW!
then I tried and I said UH!
well it is not that easy under real amiga (maybe it is better with winuae because I heard it can use ipf instead of adf).
I tried with rtype2.ipf and get an error message on stage 2 of wwarp readme (the sync part), something about raw and at the end it tells me something about a special piece of hardware I forgot the name (made by Jim Drew).
Lio