With this converter you can use an old Arcade joystick on a C64 Mini. It is converting the signal from the old type connector (DB9/Atari-based) to USB. It can be used on a stock C64 Mini machine, without any modifications.
It will also work under Windows/linux with Vice
See change log for history.
Full documentation can be found on https://www.tsb.space/projects/c64-mini-arcade2usb-converter/