US Robotics PalmPilot (1996)
The first broadly popular PDA, [[xref:http://www.pcworld.com/article/4788/us_robotics_palmpilot_wins_hands_down.html?tk=rel_news|the PalmPilot|U.S. Robotics' PalmPilot Wins Hands Down]] arrived with a passive black-and-white LCD, either 128K or 512K of RAM, and a distinctive four-button layout dedicated to personal information management. The primary innovation was the Graffiti handwriting recognition system, which enabled users to enter (slightly modified) characters with a stylus directly on the LCD. A legal challenge forced Pilot to be dropped from the name, but over the years, a large ecosystem of inexpensive applications grew up around the Palm, helping it maintain long-running dominance in a fast-moving PDA market.