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The PA-8000 (PCX-U), code-named ''Onyx'', is a microprocessor developed and fabricated by Hewlett-Packard (HP) that implemented the PA-RISC 2.0 instruction set architecture (ISA).〔Hunt 1995〕 It was a completely new design with no circuitry derived from previous PA-RISC microprocessors. The PA-8000 was introduced on 2 November 1995 when shipments began to members of the Precision RISC Organization (PRO).〔"HP Announces Release of PA-8000 to PRO Partners".〕 It was used exclusively by PRO members and was not sold on the merchant market. All follow-on PA-8x00 processors (PA-8200 to PA-8900, described further below) are based on the basic PA-8000 processor core. The PA-8000 was used by: * HP in its HP 9000 workstations and servers * NEC in its TX7/P590 server * Stratus Computer in its Continuum fault-tolerant servers ==Description== The PA-8000 is a four-way superscalar microprocessor that executes instructions out-of-order and speculatively.〔〔 These features were not found in previous PA-RISC implementations, making the PA-8000 the first PA-RISC CPU to break the tradition of using simple microarchitectures and high-clock rate implementation to attain performance.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PA-8000」の詳細全文を読む スポンサード リンク
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