THINK: A brief history of ThinkPads, from IBM to Lenovo - NotebookCheck.net News
History of the ThinkPad
40 years of the laptop: how mobile PCs changed the world | TechRadar
How the IBM PC Won, Then Lost, the Personal Computer Market - IEEE Spectrum
THINK: A brief history of ThinkPads, from IBM to Lenovo - NotebookCheck.net News
Coffee, Dogs and History - The worlds first portable computer / laptop in 1975. The IBM 5100 cost over $20,000 First introduced: September, 1975 CPU: IBM proprietary, 1.9MHz RAM: 16K, 64K max