129 ps1 games are now playable on Vita, here's a list of all of them (all your Final Fantasys are belong to us.)

[Chark]

Troll_Whisperer said:
So... where are the PSX games on the store??

Under Playstation One Classics under the ALL tab. Or just check new releases. You are in Japan though right? When does your store update? US does on Tuesday, EU on Wednesday.