IEEE Binary Floating-Point is an industry-standard architecture. The IBM System/360~(TM) hexadecimal floating-point architecture predates the IEEE standard and has been carried forward through the System/370 ~(TM) to current System/390 processors. The growing importance of industry standards and floating-point combined to produce a need for IEEE Floating-point on System/390. At the same time, customer investment in IBM floating-point had to be preserved. This paper describes the architecture hardware, and software efforts that combined to produce a conforming implementation of IEEE Floating-compatibility with the original IBM architecture.
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