How come that "Donkey Kong" for the NES only has a PRG1 version? Basically every other game starts with PRG0 and then when it has a second revision, that one gets the PRG1 label. So, what's the deal with "Donkey Kong" having only PRG1? The same is true for "Donkey Kong Jr." and "Popeye". The three Japanese launch titles and first ever NES/Famicom games.