Amdahl Corporation, a manufacturer of IBM-mainframe-compatible computers
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Gene Amdahl, formulator of Amdahl's law of parallel computing and founder of Amdahl Corporation
NAS, as well as Amdahl (the other IBM-compatible mainframe maker), was no exception to facing the technological and sales pressure from IBM.
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).
During 1960s–1970s, several other companies, such as Amdahl, Siemens and Hitachi, had also cloned the IBM architecture without IBM's approval.
NAS, as well as Amdahl (the other IBM-compatible mainframe maker) was no exception to facing the technological and sales pressure from IBM.
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.
The board of directors included Carl Amdahl (General Partner at DCM and son of Gene Amdahl), Ryan Floyd (General Partner at Storm Ventures), S. "Sundi" Sundaresh (former President and CEO of Adaptec), Jackie Yang (Managing Director at TransLink Capital), and Eric Young (General Partner and co-founder at Canaan Partners).