![]() : CPU 139 Although IBM famously chose to exclude virtual storage from the S/370 announcement, that decision was being reconsidered during the completion of the 145 engineering, partly because of virtual memory experience at CSC and elsewhere. The S/370-145 had an associative memory : CPU 117-CPU 129 used by the microcode for the DOS compatibility feature from its first shipments in June 1971 the same hardware was used by the microcode for DAT.
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