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Structural aspects of the System/360 Model 85, II: The cache

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The inclusion of a storage hierarchy represents one of the major advances in system organization present in the Model 85. Although the concept of a storage hierarchy is not new, the successful implementation of a nanosecond/microsecond level of hierarchy was inhibited until now by the lack of a suitable technology. As implemented in the Model 85, the fast monolithic storage physically integrated with the CPU logic yields the desired machine speed, while the large core storage yields the desired storage capacity, the combination being transparent to the user. It is likely that with future progress in technology this nanosecond/microsecond hierarchy is not merely an innovation that worked out well for the Model 85, but rather it is a fundamental step forward that will be incorporated into most large systems of the future.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

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IBM Systems Journal  (Volume:7 ,  Issue: 1 )