If you need a ROM for your emulator or the real thing take a look at the ROM archive of Zophar. This archive contains CRT, D64, D81, PRG, T64, ADF, and other formats. There is a section for the C64, VIC20, Plus/4, Amiga and the Amiga CD32. But if you like other systems than Commodore you find them too. Other systems like Nintendo, Atari, Colecovision, Vectrex and many more. The whole archive holds 238,843 files for 65 different consoles, spanning a total of 772 GBs of games.