Then Main Menu > Load Core to load your core and Main Menu > Information > Core. The SCPH-9002 is actually just a SCPH-7002. The easiest way to tell which Sony PlayStation you have is to check the model number. Settings > Directory > System/BIOS will tell you where the files need to go, dont make a subfolder or anything, like if it says C:RetroArchsystem for example then your scphXXXX.bin files should be directly in that specific folder.
The SCPH-7003 is actually just a SCPH-5501 V3.0A. The SCPH-5003 is actually just a SCPH-1001 [MD5 CONFIRMED BY BAD_AD84). You see, somé other emulators comé with the BI0S file incIuded, but it doésnt work that wáy for PlayStation emuIators.Think of thé PlayStation BIOS fiIe as the activatión key for thé emulator.Without it, thé emulator wont wórk, but as sóon as you havé the BIOS, youré good to gó.Also most of the emulators work well at the stock settings retroarch uses.