emu info help?

i see on the psp-news page a download of gameboy/gameboy colour roms has been added. it says 470 to try on you RIN emu (13mb download), now does this mean you get 470 full games for a 13mb download and is it possible to have more than one emulator on your psp and a selection of games for each emu? if you have a 1gb memory card does this mean you can have 1000's of different console games on your psp for nowt! if so i think i might shot myself for updating to 1.5:( (wont be getting 1.51 so quickly). any help greatly appreciated