Thanks DamienD ^^
I ll put all these settings on and make an other test
I had noticed that I should play lemmings on A500 and that s I will do for my next game session but I ve shown the config I had in A1200 because that was the config I had set when I played all the other games before, I thought that could be interesting to show the config I used to play the games before I come on this forum, this was a preset of a website who gave settings for winUAE. But when I ll play these game next time I ll put them on A500 like you said
I m sorry, I know that I m a pure noob but I ll remind all your advice and save the settings like you said to play on the correct Amiga after all that ^^