Or at the rear of the keyboard -A3000, A3010, A3020, A300 series, A400 series, A4000, A5000 and. Middle mouse button is the scrollwheel button on pc mice.
Acorn USB Mouse Adapter for Archimedes Computers with Round 9 Pin DIN
Amiga & Atari ST USB mouse adapter (READ DESCRIPTION)
Amiga USB mouse adapter
SGI Indigo PS/2 Keyboard And Mouse Adapter
Amiga Tank Mouse Upgrade - New Modern Optical Mouse with Adapter
RGB to HDMI Adapter, Assembled & Complete, for Acorn BBC Microcomputer
