Cambridge Adaptive Communications (CAC) provided Dr. Stephen Hawking, a motor neurone disease sufferer, with the wheelchair-mounted computer in communicating with the world. CAC supplies technology for those, particularly children, who are unable to communicate through normal speech. CAC's-main product, the Cameleon battery powered adaptive computer, is made in very low volumes, of around 100 a ... [Show full abstract] year. The Cameleon user moves a sensitive microswitch on the computer to select words or symbols on a VDU screen on the wheelchair arm. The words can be either fed into a speech synthesizer to read and then speak the words chosen or assembled into documents for printing out later. The design was the CAC's first foray into 3D CAD.