The HITAC5020 time sharing system

HITAC5020 time sharing system with a two-dimensional addressing feature was developed to accomplish the following: 1) to establish a design for a time sharing system with a two-dimensional addressing scheme, 2) to establish the structure of the required file system, 3) to explain the intrinsic nature of the man-machine interaction, 4) to expedite studies for productivity improvement of software. This type of time sharing system has great merit in comparison with conventional time sharing systems and will likely be the basis for many future large scale information processing systems. In this paper, we first describe the segmentation and paging mechanism; then we discuss some important parts of the supervisor which are characteristic of two-dimensional addressing, especially scheduling and swapping, dynamic linking, and how to process common segments.