Some time back, Karl Clark released ArcMouse, an interface that could be plugged in to the mouse port on Archimedes-era ARM-based computers from Acorn and allowed a more standard USB mouse to be used.
Karl has now improved on the design, and has launched ArcMouse version 2.
The new design is that at just 12mm wide, it’s notably smaller than the older version, which makes it more compatible with the ‘all in one’ style of RISC OS computer from Acorn (such as the A3000, on which the mouse port is in a small recess on the underside of the case).
Like its predecessor, ArcMouse v2 (and therefore the computer it’s connected to) can be used with almost any USB mouse, including certain wireless models from Logitech and Philips.