@substring
Hi Substring,
thank you for your quick answer.
I was wondering how other users play Amiga, C64, Atari ST games? i use to play these games with an competition pro as an teenager. I would like to use one as its like back in the 80s and 90`s :).
The ps3 controller is not the same and feels wrong :(. How do you test these systems?
i found this on ebay as an male plug
https://www.ebay.de/i/263554257005?chn=ps&dispItem=1
The wirering should not be an problem but what do you mean with ..
"But you'll be vety limited as you won't even be able to fully configure it as expected because it's lacking buttons :/"
i only want to use it to play. For controlling recalbox i would use ps3 controller or keyboard. Is this a problem? Can i use both DB9 and ps3 controller bluetooth?
There is an intressintig way to rewire the joystick to support up to 3 Buttons (only for gaming) 
http://wiki.icomp.de/wiki/DB9-Joystick
Thank you
Gordi