How the personal computer became a million dollar idea

Years ago computer buffs thought our lives would be run by a handful of supercomputers, dotted around the world.

Now, though, we have computers of our own - personal computers. They range from the desktops we use at work to the smartphones in our pockets.

But who first came up with the concept of a personal computer? And who wrote the all-important programs which make them work?

Aaron Heslehurst explains.