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In page GE-600 series:

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The 605/615/625/635 and 645 were essentially second generation computers[5] with discrete transistor TTL logic and a handful of integrated circuits. Memory consisted of a two-microsecond ferrite core, which could be interleaved. GE bought core memory from Fabri-Tek, Ampex and Lockheed. The Lockheed memory tended to be the most reliable.[citation needed]