Quote:
If you are going to play in a system that needs a BIOS (e.g. PS1), place the BIOS files in RetroArch's 'system' directory.
Mednafen is very picky about which BIOS to use. The ones that you might need are:
scph5500.bin
scph5501.bin
scph5502.bin
If you can't find one of these, just rename the respective scph100x.bin BIOS (such as scph1001.bin) to scph550x.bin (such as scph5501.bin) and it will take it.
I use Retroarch myself, can be a bit of a pain in the rear to get it set up the way you want it but once you do , (and do that annoying procedure with multi disc PSX games) its pretty fun to use.