【University of Tokyo】 PC-2 Large Parametron-Based Computer

In 1960, Tokyo University developed the PC-2, a large, high-speed parametron computer. It was developed by the Takahashi Laboratory (School of Science, University of Tokyo) based on the development results from the PC-1 parametron computer. The clock frequency was increased by raising the excitation frequency to 6MHz, and the system was equipped with 48-bit/word (12-bit characteristic, 36-bit mantissa) floating point arithmetic circuits, and high-speed address calculation circuits. It used approximately 13,000 parametrons. The target clock speed was 100KHz, but the actual value was about 60KHz. The two-frequency ferrite core system was used for main memory. The PC-2 was the largest and fastest parametron computer. It was fabricated by Fuji Telecommunications Manufacturing (currently Fujitsu), and was marketed under the name "FACOM 202". The PC-2 is currently preserved at the National Science Museum in Tokyo.