NEAC-2201

In September 1958, NEC completed their first transistor-based computer, the NEAC-2201. This machine was based on the ETL MARK IV of the Electro Technical Laboratory, and was developed by a team at NEC organized around Hiromu Kaneda and Yoshio Miyagi, and under the guidance of the Electro Technical Laboratory. It was comprised of a computer main unit, a console and input/output devices (a paper tape punch typewriter and a photoelectric tape reader). Germanium alloy high-speed transistors were used as circuit elements, and a magnetic drum was used for the internal memory unit. The system was distinctive in that it was fabricated using only Japanese made components. By using transistors, the system achieved an astonishing level of miniaturization, with a main unit size of only 1.1 meters in width and depth, and 1.6 meters in height. This computer was developed for business use. It employed the decimal system, with 10 decimal digits as 1 word, and addresses were also decimal. A magnetic drum from Hokushin Electric was used for the memory unit. Memory capacity was 1,040 words, with 40 words of that storing the same content 5 times over the circumference, thereby achieving high-speed access with a reduced access time.