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The first chapter of this commemorative issue is devoted to the subject of computer systems architecture and development. It contains eight papers dealing with different facets of the evolution of modern computer systems at IBM over approximately the last three decades, beginning with the design of an experimental electronic stored-program machine in 1949 and covering the latest principal extensions to IBM's computer products and systems—large, intermediate, and small. Also included are accounts of the technological advances made, over the same time period, in the areas of data communications, real-time systems, and reliability/ availability/serviceability (RAS).
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