The Balance 21000 included up to thirty 10 MHz National Semiconductor NS32032 processors (in multiples of 2), each with a small write-through cache connected to a common memory to form a shared memory system.
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During this period, the NUMA technology became the basis for IBM's extended X-Architecture (eXA, which could also stand for enterprise X-Architecture).
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In 1993 they added the Symmetry 2000/x90 along with their ptx/Cluster software, which added various high availability features and introduced custom support for Oracle Parallel Server.
Since then, occasional bursts of Unix factionalism have broken out, such as the HP/SCO "3DA" alliance in 1995, and Project Monterey in 1998, a teaming of IBM, SCO, Sequent and Intel which was followed by litigation (SCO v. IBM) between IBM and the new SCO, formerly Caldera.
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