Tablet computing has a long and tortured evolution. We can trace its roots all the way back to 1915. That's when the U.S. Patent and Trademark Office awarded a patent for a handwriting recognition system of sorts. In 1956, researchers demonstrated the first digital computer with handwriting recognition.
The modern tablet's more recent evolution started in Cupertino, but not with the iPad. Many manufacturers, including Apple, tried and failed at flat computers before the devices finally became mainstream must-haves. Take a look at 12 major moments that led to the tablet PC as we know it today.