Light Pen & Trackball : popular computer input device
Light pen - Wikipedia
UNDERSTANDING COMPUTERS: Pen Input
Computer - Input Devices
Computer Graphics | Light Pen - javatpoint
Light Pen | PDF | Office Equipment | Input/Output
Light Pen | Lamoste Edlyn Mae
Tube Time on Twitter: "this is a somewhat obscure computer input device called a "light pen." im going to try and get it working. (thread) https://t.co/DIyGFk3mqm" / Twitter