In the spring of 1981, David Bradley was part of a select team working from a nondescript office building in Boca Raton, Fla. His task: to help build IBM’s new personal computer. Because Apple and RadioShack were already selling small stand-alone computers, the project (code name: Acorn) was a rush job.

Instead of the typical three- to five-year turnaround, Acorn had to be completed in a single year.

Read the full article on http://mentalfloss.com, written by Virginia Hughes.