IBM quickly lost control of the market it had helped create, going from industry-leader to quietly exiting the personal computer business in just a couple of decades.

The first IBM PC kicked off what would be a line of computers that would be sold through the 1980s. This week, Quinn and Stephen hit the high points of this beige wave.

With its PC built, IBM needed to find an operating system that would run on it. Its choice would change the computer industry forever.