you can make those yourself, if you have the actually psx game or iso, you will need a program to convert them to pbp format. I use POPstationGUI to convert psx game to psp format. ISOs for psp games, your gonna have to look in the usual places...If you find them tho stick them in the ISO folder, psx games go in GAME folder, just like homebrew
You will not find any of these at that site, they generally just have homebrew. Are you interested in emulators, check these out.
Gameboy/gameboy color.........RIN
Genesis/Sega CD....................PicoDrive
UO gpSP Kai 3.2......................Gameboy Advance
NesterJ...................................Nintendo
SNES9x TYL ME.......................Snes
just do a search for these programs on a search engine, or on a psp site. These are the ones on my memory card now, they all work pretty well.
If you plan on having lots of ISOs, you may want to get a 4gb mem stick or maybe even an 8gb. PSP ISOs are anywhere from 100mb up to 1.1gb. PSX ISO are up to 600mb, most of mine are 200-300, compressed.