So he built a low cost, simple adapter to use his RS-232 ... If you’d rather build your own, modern 3D mouse, check out the DIY Cad Mouse You Can Actually Build.

Since the 1990s, the design department at Knott has recognized the advantages of 3D CAD software for designing brakes and trailer components. In 1998, research led the company to PBU CAD-Systeme GmbH, ...