Laptops, tablets and smartwatches: The evolution of mobile computing
Mobile computing is becoming increasingly ubiquitous. From Chromebooks to smartphones and tablets - and even smartwatches and smart glasses - it is possible to carry huge amounts processing power with us each day.
But the success of these devices is due at least in part to the pioneering work of many companies in decades past.
Important milestones in portable computing include devices such as single chip calculators, "laptops" that weighed nearly two stone, digital organisers and even a few older Apple inventions. Here's a look at 21 of the most notable mobile computers.