Here’s a great alternative to floppy disks for C64 enthusiasts via FozzTexx:
A video which shows the software I wrote for the Raspbery Pi to let it act as a disk drive for a Commodore 64. I’m able to get directory listings and load software from the Pi right onto the 64. There’s only some level shifters being used, the Pi is doing the IEC protocol directly. No arduinos or AVR or PIC microcontrollers are used.
Source code and more here!