Originally I wanted PIU Zero for the NX songs (not like I'll ever pass Chimera or Wi-Ex-Doc-Va CZ on pad, so might as well enjoy them on a PSP). If the load times are obscene (and I heard that it's possible to mess up your save file if you do...whatever it was I don't remember) then I might as well just load the MP3s onto the stick instead.
I ran into some input issues with Exceed (and, from what I've heard, Zero has them as well). The game just seems to give spurious misses from time to time. Very frustrating.
Ian - Unfortunately, I'll be honest and say 'I don't know a damn thing' about most SNES games.
S'okay.
Probably the big ones for me were:
- Super Mario Kart
This uses the DSP-1 chip as a math coprocessor. I'm not sure how well SNES9X on the PSP emulates this particular chip, since I haven't tried to play a game with that chip on it yet.
- Kirby Super Star (can skip - after all, we have Ultra for DS now)
I guess it sort of depends on how much the game uses the chip, but if Kirby Super Star is as cutting edge in the graphics department as its predecessors were there's just no way.
The SA-1 basically acts as a second CPU that functions independently of the SNES's main CPU and has to be emulated separately. I'm not sure if the PSP simply cannot handle it or if the emulator just isn't as optimized as it could be. Either way, games that use it don't run well.
- Tetris Attack
This doesn't use any enhancement chips. I'd have to try it for myself to be sure, but I can't see why there would be a problem running this at a good speed.
- Yoshi's Island
No way in hell.
This game uses the SuperFX 2 chip, the more powerful successor to the version that's used in Star Fox and some other games. It, like the SA-2, is a separate processor that runs independently of the SNES's main CPU, but this thing goes way beyond what the SA-1 can do. I think my framerate was in the single digits when I tried to play Yoshi's Island on my PSP.
On the bright side, you can always grab gpSP -- a GameBoy Advance emulator -- and use your PERFECTLY LEGITIMATE ROM image of Super Mario Advance 3. Almost the same game, slightly reduced resolution, at full speed.
- Earthbound (hooray for it working at reasonable pace)
Earthbound doesn't seem to utilize any enhancement chips, so it's very possible that other games that lack them will be unable to run at full speed. You'll have to try them out for yourself.