Yesterday’s PS3 Firmware update added an unexpected new feature to the PlayStation 3, allowing the PSP to play PSOne titles via Remote Play. With PS3 Firmware 2.10, the PSP can now be used to play PSOne titles downloaded from the PlayStation Network Store or using an original PSOne disc. This is great news for those of you who have kept your old PSOne games, and also good news for those who have downloaded PSOne titles.
In order to play PSOne titles, your PS3 needs to be running Firmware 2.10 and your PSP must have Firmware 3.80 installed. If you are using a custom firmware, you are advised to wait until Dark_AleX releases Custom Firmware 3.80 M33, which he is currently working on.