抄録
Research and development of electronic computers started in late 40's in Japan. After the invention of transistors in the US and parametrons in Japan, laboratories and manufacturers started developing computers using transistors or parametrons as logical elements. Therefore only four vacuum tube computers were manufactured in Japan. These are Electronic Computer at Osaka University, FUJIC of Fuji Photo Film Company, TAC of University of Tokyo and ECL RTC. Though the first generation of computers was rather short in Japan, the technical contribution of the development of vacuum tube computers is valuable. This paper reviews the development efforts of the former two vacuum tube computers, Osaka University's and FUJIC.
