ETL Mark III

This was a transistor-based binary electronic computer prototyped in 1956 by the Electrotechnical Laboratory. It is thought that this was probably the world's first transistor-based electronic computer using the stored program method. The machine was called the Mark III, since it was the successor of the ETL Mark I relay-based computer (completed in 1952 by Goto Mochinori, the Laboratory Director at that time), and the Mark II, a larger practical machine which was under development at that time. The research and development of ETL Mark III were conducted mainly by Takahashi Shigeru, Nishino Hiroji, Matsuzaki Isokazu and Kondo Kaoru of Electronics Research Division.