International Computers Limited

John E Murray

John Richard Eaton

Peter L Desyllas

Barry Gordon Radley

Alasdair Rawsthorne

A data processing system has a two-level storage system in which data items are copied from a main store into a smaller, faster slave store on demand. The mapping of the main store on to the slave store is a many-to-one mapping so that situations will occur where two required data items cannot both be present simultaneously in the slave store because they map on to the same location. The system has special logic which detects this situation and, upon detection, temporarily suspends the use of the slave store and instead uses a smaller first-in first-out area of storage.

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Salford, United Kingdom

John E Murray