3 ms·The TX-2 Computer and Sketchpad (2012) [pdf]48 points by jpelecanos 9y agonicolashahn 9y agoDemonstration of Sketchpad and the light pen: https://www.youtube.com/watch?v=USyoT_Ha_bA#t=04m36s https://www.youtube.com/watch?v=USyoT_Ha_bA#t=04m36s