Works and fits in all Amiga models (even Amiga 600) including the Boot Menu when holding both mouse buttons on startup. No drivers required just plug and play.
This can also be used on an Atari ST computer but simply changing the jumpers on the board (soldering required). Please note must be used with a PS/2 mouse or a USB mouse that has native PS/2 support VIA a convertor such as a Microsoft Intellimouse.