Pre-2000, most computers were based on software developed in..

UPSC Practice recommends Pre-2000, most #computers were based on software developed in the 1960s and 1970s, and they marked the year in two digits – say, 98 or 99. A four-digit year, as in 2000 or 2001, had not been worked in. A crash would mean unprecedented global chaos. 3/8

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