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| Nostalgia |
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| In the Olden Days …. |
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| • | Reformatting
and processing data was a common |
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| activity |
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| • | Merging
navigation with measured and computed |
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| results
also took time |
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| • | First
data management system used 9 track tapes |
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| for
data storage, run in batch |
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| • | Second
system used data on disk with techniques |
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| to
located data within degree squares to improve |
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| performance |
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