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Parallel Enterprise Server - technical definition
A family of S/390 (System/390) mainframes from IBM that are air cooled and use CMOS-based microprocessor technology (CPU on one chip). Introduced in 1994 as the 9672 series, Parallel Enterprise Servers rapidly replaced the earlier water-cooled, bipolar machines that were considerably larger and more power hungry.
S/390 G4 Model
IBM's air-cooled, CMOS-based mainframes hardly resemble the huge water-cooled, bipolar models. (Image courtesy of International Business Machines Corporation. Unauthorized use not permitted.)
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