ETL Mark I

The ETL Mark I was Japan's first digital automatic computer -- prototyped in 1952 by the Electrotechnical Laboratory using relays. It was a completely asynchronous type. Komamiya Yasuo applied a method of solving logic function equations (based on the logical mathematics of Goto Mochinori) to the design of computation circuits, and in 1951 made use of the results, which had been integrated into a theory of electrical computation circuits.