Bulk core in a 360/67 time-sharing system

Abstract

In the fall of 1965, Carnegie Institute of Technology decided to install Large Capacity Core Storage (LCS) as the auxiliary storage device on its IBM 360/67 Time-Sharing computer system. The bulk core will be used as a swapping device, replacing the drums of conventional configurations, and as an extension of main core memory. The decision was motivated by an analysis which yielded the following results: • The effective rate at which the system can deliver pages to user tasks is increased to its theoretical limit with LCS, representing a significant improvement over drum performance. • The potential response time to users is decreased because LCS has no rotational delay. • Less main core is needed for effective system operation.