ZeroPaige on the Lemon64 Forums has announced that after 7 years of development, they have ported Super Mario Bros over to the Commodore 64 computer!
- D64 disk image
- Documentation
- ROM image for cartridge
More details can be found at the official Lemon64 post. Download quickly as Nintendo will most likely make requests to take down the file.
Apparently this is still in development as version 1.2 has been released as of 12/30/19. Link to follow:
https://www.lemon64.com/forum/viewtopic.php?p=898195#898195