Persona 3 is for the Playstation 2, and there's an updated re-release on the same system called Persona 3 FES.
There's also a port on the PSP called Persona 3 Portable.
The first Persona received a rather shoddy localization and was released on the SNES and Playstation. There was an improved re-release on the PSP.
Persona 2 is technically two games, Innocent Sin and Eternal Punishment. Both were released for the Playstation and later re-released on the PSP. Only localizations for the PSP version of Innocent Sin and the PSOne version of Eternal Punishment exist, though there's a fan-translation for Innocent Sin's PSOne version on the internet.
Persona 4 was originally released for the PS2, and an updated re-release exists on the PS Vita.
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There's also a port on the PSP called Persona 3 Portable.
The first Persona received a rather shoddy localization and was released on the SNES and Playstation. There was an improved re-release on the PSP.
Persona 2 is technically two games, Innocent Sin and Eternal Punishment. Both were released for the Playstation and later re-released on the PSP. Only localizations for the PSP version of Innocent Sin and the PSOne version of Eternal Punishment exist, though there's a fan-translation for Innocent Sin's PSOne version on the internet.
Persona 4 was originally released for the PS2, and an updated re-release exists on the PS Vita.