Amiga/Atari ST mouse
Schematics based on: http://atariamiga.free.fr/sourisps2_e.php
Software 1.3 from: http://eab.abime.net/showthread.php?t=66443
Eagle board file: mouse.brd
You can use PS/2 or USB connector, but only PS/2 mouse will work. Some mouses support both protocols, so if You're lucky, You can find a mouse with USB plug able to work with PS/2 protocol.