NEAC Series 2200 Model 400

The NEAC Series 2200 was based on the one-machine concept. It had the same uniform architecture throughout the lineup, from low-end to high-end models, and increasing data processing volume could be handled by shifting to a higher end model, so program assets could be inherited and reused. Five models -- the Model 100, 200, 300, 400 and 500-- were announced in May 1965. After that, the small Model 50 was added in August 1966, and the top-end Model 700 in November 1968.