The first electronic digital computer was invented at Iowa State University (ISU) from 1937-1942 by John Vincent Atanasoff and Clifford E. Berry. It was not until 1973 that the Atanasoff-Berry Computer (ABC) was credited as the first invention, and not until 1997 that a replica was built.

Here are the plans, open online for the first time. Learn more about and discuss the ABC Computer, and help build more replicas, miniature and full-scale.