Sony enabled PS2 backwards compatibility for the PS4 without telling anyone" : r/PS4
PS4 backwards compatibility: Can You Play PS1, PS2, and PS3 Games on PS4?
Is The PS4 Backwards Compatible?
Over 500 PS2 Games Now Playable For Hacked PS4 Consoles - Gameranx
PlayStation 5 backwards compatibility for PS1, PS2, and PS3 games could be provided by a revamped PS Now service with upscaling capabilities - NotebookCheck.net News
PS4 backwards compatibility: Sony asks players for PS2 wishlist | The Independent | The Independent
Is The PS4 Backwards Compatible?
PS4 backwards compatibility: Can You Play PS1, PS2, and PS3 Games on PS4?
PS5 listing shows backward compatibility for PS2, PS3, and PS4 — don't get too excited | Laptop Mag
Can you play PS3 games on PS4? PlayStation 4 backwards compatibility explained
PS4 PS3 PS2 PS1 Backwards Compatibility Update - For PS5 ! PS5 Release Date Saga ! - YouTube