http://www.vesalia.de/e_rysmk2.htm
Rys Mk II USB Adapter
Amiga Interface for USB Mice and Joysticks
Rys Mk II is an interface enabling you to connect mice and joysticks/gamepads with USB interface to your Amiga. The hardware is based upon a 16-bit Microchip microcontroller, the software side features an internal USB stack to communicate with the USB HID devices (mice or game controllers).
Features
support for mice (both USB HID and USB PS/2 protocols)
support for USB HID joysticks
support for USB HID pads
ready for use with every Amiga (although some models may require additional adapters)
ready for use with Commodore 64 (without support for mouse)
ready for use with Atari ST (requires additional adapters)
built-in USB stack
"Bootloader" function allowing future firmware upgrades
status indicator LED providing information about the device state
built-in EEPROM storing user preferences
built around 16-bit Microchip microcontroller utilizing nanoWatt technology
three mouse emulation modes
joystick mode (emulating original joystick behavior)
pad mode (emulating original pad bahavior)