Here is a pops compatibility list please add to it by leaving a comment if you can help with the list. The in-built PSX emulator for the PSP, developed by Sony. Each firmware has it’s own, though some share the same binary. A plugin use to load different versions of pops. When you download a PSOne Classic form the PSN store, it comes with keys.
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The old popstations generate one, but this is not required anymore with the newer popstations.