Slide rules to freeware

Slide rules, nomograms, and logarithm tables were standard productivity tools before the mid-1960s.Mechanical calculators that could handle floating-point decimals became available in the 1960s. Electronic scientific and programmable calculators displaced this technology in the 1970s.In the 1970s and early 1980s, OGJ published numerous engineering programs that would run on programmable calculators. But one laborious task was to accurately key in steps that often numbered over 500-even in reverse Polish notation. Bar code options eventually helped with input.Personal computers began displacing programmable calculators in the 1980s, initially with Basic programs and then with spreadsheets....

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