Radio Shack TRS-80 Model 100 (1983)

 In the early 1980s, when people talked about "portable computers" they meant luggable monstrosities like the 24-pound Osborne I. Then Radio Shack introduced the Model 100, the first popular notebook. Starting at $799, this 4.25-pound featherweight boasted built-in word processing and other apps, and its internal modem let road warriors get online at a zippy 300 bits per second. More than 20 years later, the full-travel keyboard on the TRS-80 is still pretty impressive.