Modders ran RPCS3 on PS5 via Linux, letting many PS3 discs play on PS5. Works only on PS5 firmware 3.XX–4.XX, needs a Linux install and your own decryption key. It's unofficial and complex to set up; ...
TL;DR: Digital Foundry tested PS3 emulation on a hacked PS5 using RPCS3, finding games that avoid heavy Cell processor use run well with improved visuals, while CPU-intensive titles perform poorly due ...