This futuristic touchscreen device ran on the MS DOS 3.3 operating system, and users interfaced with it via a stylus or an on screen keyboard. Did it succeed? Around 10,000 of these babies were sold, which the company called a mild success. Considering that 21 million personal computers were sold in 1989 alone, the Gridpad was merely a drop in the bucket. For comparison, Apple iPad sold 300,000 units on its first day in April 2010, and the $499 tablet weighed just 1.5 pounds. Now, there were...
