While there are other emulators out for the Commodore 64 (C64), this is based off of the first one, that appeared in 1991. The two downloadable components to running the emulator are called “Frodo” and “Bilbo”. You’ll need to download them both in order to be able to use it.
if you’re not sure what an emulator is, or want to know more, check out this orientation we did earlier this year.