Came across this blog-post and instantly knew I wanted one, but given that I already had all of the components in a drawer somewhere from my PI1541 project I figured I'd rather put them on a PCB instead of soldering loose wires. What it does? Well, it gives you a USB-interface that you can connect up to your old Commodore 64 disk drive (Commodore 1541). Combining it with the OpenCBM software and you can quickly archive your aging floppy disks to d64-files, files that can later be used with emulators or even your original Commodore 64 (PI1541 or other cycle-exact drive emulators).

Check out the accompanying github-page for more details, especially the firmware installation document for instructions on how to flash the Arduino Pro Micro with the firmware as well as set up the software within Microsoft Windows 10 (follow instructions exactly).