This is a report obtained from my studies in Tokyo University for the past year. This report consists of four parts: (2) TECNET (Tokyo Experimental Computer Network); (2) the construction of File Control System; (3) TSS (Time Sharing System) andits File Control System; (4) HITAC 8700/8800 Online File Control System. And all these items are described in the field of hardwear and System Constitution. Moreover, I should like to say that all of them are a part of Computer Network and its basis.
