Proceeding his Sega Game Gear / Master System PS4 Demos and PS4NES / PS4GearSystem PKG Filereleases, PlayStation 4 developer m0rph3us1987 made available a full speed Nintendo Entertainment System (NES) Emulator port based on LaiNES for PS4 5.05 jailbroken consoles!
Download: EP0001-PNES00001_00-RELEASE000000001-A0100-V0100_V505.pkg (8.3 MB)
To quote from the related Tweets embedded below on the PS4 NES Emulator release: “PAL Roms work fine, NTSC roms are a little slower because of the different clockrate of the NTSC NES. Have fun
Create a folder called roms on the root of your fat32/exfat formatted USB drive, and put the roms inside. Then attach the drive to the right USB port of the PS4.
I forgot to mention that it’s only for fw version 5.05.”