| 21. | It had a magnetic drum memory of rotating at and could invert a square matrix of order 25 in half an hour.
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| 22. | The program was stored as a bit image on a continuously running magnetic drum, and loaded in a fraction of a second.
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| 23. | The use of a magnetic drum for memory meant that computer programs also had to be interleaved with the rotations of the drum.
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| 24. | BRLESC employed punched cards, magnetic tape, and a magnetic drum as input-output devices, which could be operated simultaneously.
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| 25. | Routing information would be placed on the magnetic drum, which could store thousands of routes and could be easily changed on demand.
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| 26. | Like all early main-frame systems, this batch-oriented system managed magnetic drums, disks, card readers and line printers.
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| 27. | Although Rand kept the ERA team together and developing new products, it was most interested in ERA's magnetic drum memory systems.
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| 28. | The company that manufactured the rotating magnetic drum part of the Speaking Clock was Roberts & Armstrong ( Engineers ) Ltd of North Wembley.
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| 29. | Backing store was magnetic drum and optionally one-inch-, half-inch-or quarter-inch-wide magnetic tape.
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| 30. | Since a magnetic drum does not support random access, some time is lost waiting for an instruction or piece of data become available.
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