Im so sorry to inconvenience you guys but...

I'm completely lost here. I just recently got a PSP from my buddy. He had it hacked I believe to the Homebrew 1.5 I believe (im not sure about any of this). He had an emulator on it. Its a picture of Yoshi with "NesterJ Ruka" written on it. It lets me play nes roms I have (im sorry im a complete newbie to this stuff). This is what brings me to my question, how would I go about getting a PS1 Emulator on my PSP? I havent been able to find a tutorial or anything of the sort. I may not be looking in the right direction, but if someone could point me, Id be really appreciative (Really wanna play tenchu again LOL).

download psx2psp i believe or pops, take your iso and convert, then copy the eboot to X:\psp\game [x is the directory of ur psp]