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In page Reduced instruction set computer:

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By 1992 Sun, DEC, HP, and IBM were the leading commercial RISC companies.[13] Other vendors began their own RISC efforts. Among the available architectures were the DEC Alpha, AMD Am29000, Intel i860 and i960, Motorola 88000, IBM POWER, and, slightly later, the IBM/Apple/Motorola PowerPC. Many of these have since disappeared due to them often offering no competitive advantage over others of the same era. Those that remain are often used only in niche markets or as parts of other systems; of the designs from these traditional vendors, only SPARC and the PowerPC-derived Power ISA have any significant remaining market.[citation needed]