Is it that inconceivable that there could be emulation involved? Not even with parts of the data preprocessed? Some things I noticed- If it is just a port, why does it retain the two 'press start' splash screens, or the 'free play' sign when the PS2 port didn't? That much is aesthetic but there is also slowdown in this version is more severe in places than the PS2's, which would likely be something you'd iron when doing a port, right? Additionally, the 'accept' button in-game is mapped to whatever button you assigned to shoot- not the traditional X or O (as in the PS2 version and the other games). Finally, when you have a title consisting of easily-emulated games, why add the extra headache of adding another title that you'd actually have to port all at the last minute? It's inconceivable because the PSP doesn't have nearly enough ram or speed to be anywhere even close to being able to run a Dreamcast emulator (Atomiswave is Dreamcast + extra ram). The PSP has 36mb and the Atomiswave has 72; I hope you're following me here... but it's just not possible. It's much more conceivable that they simply ported the Atomiswave version rather than the ps2 version.