Sony enabled PS2 backwards compatibility for the PS4 without telling anyone" : r/PS4
Why PS1 and PS2 discs on PS4 doesn't sound so crazy | VentureBeat
Petition · Sony, make the PS4 backwards compatible with a patch update · Change.org
PS5 will be backward-compatible with 'almost all' of the best PS4 games at launch | TechRadar
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
Will PS5 Be Backwards Compatible With PS3, PS2, and PS One in Update? - PlayStation LifeStyle
PS4 Backwards Compatibility: Can I play classic games on PlayStation 4? | Trusted Reviews
Hackers Just Made The PS4 Compatible With PS2 Games - YouTube
NEW PS4 Backwards Compatibility News Update - Microsoft Takes Shots at Sony - YouTube