dev_hdd0/game/CORE_FOLDER/roms/ (The exact folder depends on whether you are using a standalone MAME PKG or RetroArch).
Follow this guide carefully. The process assumes you already have a jailbroken PS3 running CFW or HEN. Ps3 Mame Emulator Pkg
The PS3 cannot natively read NTFS or exFAT drives in its default file manager, so your USB drive must use the FAT32 file system. Plug your USB drive into your PC. Right-click the drive, select , and choose FAT32 . Ps3 Mame Emulator Pkg
Launch the emulator once to auto-generate the folder structure. Then, use Multiman’s file manager to move your MAME ROMs ( .zip files) into that directory. Ps3 Mame Emulator Pkg