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IBM Journal of Research and Development  
Volume 27, Number 3, Page 198 (1983)
Systems Architecture
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System/370 Extended Architecture: Design Considerations

by A. Padegs
This paper reviews the overall objectives and the design considerations that led to the System/370 Extended Architecture (370-XA). It presents an overview of the differences between the System/370 and 370-XA architectures and summarizes all architectural extensions, deletions, and changes. Then it describes in more detail the extensions for interpretive execution, 31-bit addressing, protection, tracing, inter-CPU communications, and extended-precision floating-point division.
Related Subjects: Computer architecture; IBM System/370 Extended Architecture (370-XA)