High Quality Content by WIKIPEDIA articles! BINAC, the Binary Automatic Computer, was an early electronic computer designed for Northrop Aircraft Company by the Eckert-Mauchly Computer Corporation in 1949. Eckert and Mauchly, though they had started the design of EDVAC at the University of Pennsylvania, choose to leave and start EMCC, the first computer company. BINAC was their first product, the first stored-program computer in the US, and the world's first commercial digital computer. The BINAC was a bit-serial binary computer with two independent CPUs, each with its own 512- word acoustic mercury delay line memory. The CPUs continuously compared results to check for errors caused by hardware failures. It used approximately 700 vacuum tubes.