To this date, the PSP is still having trouble emulating the SNES. The DS and GBA can do it because they are of similar architecture as that of the SNES. It's like playing a DOS game on Windows. The PSP is entirely different architecture, and programmers are still trying to figure out how to properly emulate an SNES on that architecture. You see, with an emulator to work, you must make it think it is that system. PSP isn't anywhere near as close as DS.
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