That happened in the early 80s with personal computers.
Back when "data processing" was part of the math programs in colleges, there were just as many women as men. Women, in fact, dominated the field in many areas in the days of "big iron"-- mainframe computers.
But personal computers first entered the social sector as "boys' toys," not as serious business tools. We had to build our own computers and then figure out how to make them do something, so those of us for whom the Archer catalog was favorite reading and Radio Shack was a favorite store had a leg up. It was not presented as an interest to high school girls, so as the field turned in that direction, IT in general was no longer presented to women.
If you look at a graph of women in college taking what would become "IT" studies, the graph rides high, 50/50 male to female until about 1985, at which point the participation of women in technology begins to drop like a rock. That's when PCs happened.