The DS is only made to run DS and GBA binaries. The only way to run games made for other systems is through emulation, which requires that the DS be several times more powerful than the system being emulated. The DS is not powerful enough to emulate the Playstation, so you will not see any Playstation games being played on the DS. On the other hand, the DS is more than powerful enough to emulate the NES, so there are a couple of NES emulators that run fine on the DS.
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