ZeroPaige has released the port as a C64 disk image file that can be used directly on the Commodore 64 console or through C64 emulators. Below is a picture of the Super Mario Bros. port being ...

Once upon a time, you might have developed for the Commodore 64 using the very machine itself. You’d use the chunky old keyboard, a tape drive, or the 1541 disk drive if you wanted to work faster.