In those times, scientists were rather fond of their logarithm tables, in the same way they would of their slide rules, HP calculators and netbooks later on.
Imagine that your calculator break down every three-to-four months. After a couple of years, any hacker is bound to think "I should be able to take a couple of broken ones, pick working parts, and build a working one". Then, you discover that all of them have perfectly working '9' keys, but broken '1' keys.
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In those times, scientists were rather fond of their logarithm tables, in the same way they would of their slide rules, HP calculators and netbooks later on.
Imagine that your calculator break down every three-to-four months. After a couple of years, any hacker is bound to think "I should be able to take a couple of broken ones, pick working parts, and build a working one". Then, you discover that all of them have perfectly working '9' keys, but broken '1' keys.