Official PSN 'PSOne Classic' version, no Popsloader or anything needed.
Game ID: SLUS-00662
Works on 6.35 PRO-B3 without further modifications
Quote:When starting the game, push the HOME button, pick 'Other Settings' and change the 'Disc-Load Speed' to 'Fast'. Otherwise loading times might be really annoying. If you leave it at 'Normal', the game might take minutes to get from the PSOne-Logo to the menu, leaving you with a blackscreen. You will only need to do this step once.
This issue, however, is unrelated to the use of CFWs or anything. It is the same when using an official firmware, so don't worry!
Info, direct links etc to be found on Another Story