The original AutoCorrect didn’t use a dictionary. Instead, it checked each typed-out word against a preprogrammed table of everyday mistakes and their proper substitutions: “teh” for “the,” “friday” for “Friday,” and so on. The makers of WordPerfect, Microsoft’s major rival at the time, soon introduced its own version, called QuickCorrect.
In the years that followed, real-time spell-checkers grew more sophisticated.
Source: Who Made That Autocorrect? - NYTimes.com
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