DaedalusX64 is a Nintendo 64 emulator for Windows, Mac and PSP. The PSP port is noteworthy for being the fastest N64 emulator ever on the platform, achieving close to or reaching full speed in many popular titles.
Accurate but fast emulation
Support for PSP TV Mode - up to 720x480 output!
Active support and updates
Lots of experimental optimizations
To install Daedalus to your PSP, download the latest EBOOT.PBP release from here.
Next, plug your PSP into your computer and navigate to /PSP/GAME/. Create a folder called "daedalus" there, and place the EBOOT.PBP file inside. Place your ROM files in daedalus/Roms/ and they will automatically appear in Daedalus.