PS4 may add PS1, PS2 emulation - Gaming Discussion - Social Forums - ZIv
The PS4 can now emulate PlayStation 2 games | Ars Technica
PS2 Emulation on PS4 is Impressively Good. | GBAtemp.net - The Independent Video Game Community
As PS2 Turns 20, These Classics Must Come to PS4 - Feature | Push Square
PS2 Emulation / Directory Structure on PS4 Exploited Firmware by Flat_z | PSXHAX - PSXHACKS
GitHub - xXxTheDarkprogramerxXx/Ps2-Classics-emulators-for-Ps4: Ps2 Classics emulators for Ps4, this will allow you to use many different versions of emulator, which could improve or decrease the compatibility
PS2 Emulation on PS4 Confirmed! Sony Bringing PS2 Games to PS4. - [LTPS #179] - YouTube
PS1/PS2 emulator for the PS4 - YouTube
PS4 Getting PS2 Emulation Support - Wololo.net
Performance Analysis: PlayStation 2 emulation on PS4 | Eurogamer.net