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System Evolution

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Originally published in Queue vol. 5, no. 1
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John R. Mashey - The Long Road to 64 Bits
"Double, double, toil and trouble"... Shakespeare's words (Macbeth, Act 4, Scene 1) often cover circumstances beyond his wildest dreams. Toil and trouble accompany major computing transitions, even when people plan ahead. To calibrate "tomorrow's legacy today," we should study "tomorrow's legacy yesterday." Much of tomorrow's software will still be driven by decades-old decisions. Past decisions have unanticipated side effects that last decades and can be difficult to undo.



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