Amdahl Corporation, a manufacturer of IBM-mainframe-compatible computers
During 1960s–1970s, several other companies, such as Amdahl, Siemens and Hitachi, had also cloned the IBM architecture without IBM's approval.
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Near the end of its life, the refactored version was back-ported (as EMAS-3) to the Amdahl 470 mainframe clone, and thence to the IBM System/370-XA architecture (the latter with help from the University of Kent, although they never actually ran EMAS-3).
Their concern was that open PL/S would give competitors, Amdahl, Itel (National Advanced Systems), Storage Technology Corporation, Trilogy Systems, Magnuson Computer Systems, Fujitsu, Hitachi, and other PCM vendors a marketing advantage.
Gene Amdahl, formulator of Amdahl's law of parallel computing and founder of Amdahl Corporation