Emulation is a new project for me on Apple Devices and I really like the RetroArch system. I was able to keep track of my game saves and open all games, except playstation. With the help of google I was able to find the appropriate bios files, but I didn’t know where to put them.
If you are searching, hopefully this will help you.
As of version 1.5.0 you will navigate inside RetroArch to: settings > directory > system/BIOS
now you will navigate your file system to locate the files you want to use. I navigated to the folder holding the appropriate 4 files and now my Playstation games work.
I hope this saves you the time it took me to find the answer!
thanks Your a life saver… I just signed up on this site so I could reply…lol. But that did worked… i put the BIOS in same folder as the game i had issues with and did like you said (just point it in the direction) i tried many different things and was about to give up… 