| 1. | Large core memory holds data ready to transfer to small core memory.
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| 2. | Another form of core memory called core rope memory provided read-only storage.
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| 3. | By 1954, those unreliable methods were mostly replaced by magnetic core memory.
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| 4. | Only one active user could reside in core memory at any time.
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| 5. | Magnetic-core memory was invented in 1947 and developed up until the mid-1970s.
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| 6. | The main change was to replace the Williams tubes with core memory.
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| 7. | Large core memory holds data ready to transfer to small core memory.
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| 8. | Some very high-end machines also included core memory which provided higher speeds.
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| 9. | Very quickly a 1024-word core memory was fabricated, replacing the electrostatic memory.
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| 10. | The core memory is there-it's just getting fuzzier and less exact.
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