The story is far more complex than this, and the history makes interesting reading. As one might imagine, what we call software development today was really split into an array of roles: some more like mathematicians, some like engineers, some typists, etc.

The idea that women were somehow shut out of the industry doesn't really hold up. My programming classes in the 80s, for example, were about 50-50, and in my early career, I worked under several senior women programmers/technologists.