Ferranti Mark 1: The First Commercially Available Computer

The Ferranti Mark 1, built in 1951 by Ferranti Ltd, was the first commercially available computer, with a production run of nine machines. Designed by a team led by Tom Kilburn and Freddie Williams at the University of Manchester, it was based on the Baby machine, which successfully ran its first program in 1948. The Ferranti Mark 1 used 4,050 vacuum tubes and had a 20-bit word length, with a memory capacity of 256 words. It was a significant improvement over its predecessors, with a calculation speed of 1.25 milliseconds per addition. The machine was used for various applications, including weather forecasting, codebreaking, and scientific simulations. With its innovative design and commercial availability, the Ferranti Mark 1 marked the beginning of the computer industry, influencing the development of subsequent computers, including the IBM 701, and earning a controversy spectrum rating of 6/10 due to debates over its commercial viability and technological limitations.