The year you bought your own for the first time, most likely. Or as soon as you got to college. That would have been the mid 80s for a lot of the first wave of

The year you bought your own for the first time, most likely. Or as soon as you got to college. That would have been the mid 80s for a lot of the first wave of 'PC' owners. And shortly after that, when we all realized any machine more than 2 or 3 years old was a dinosaur, and interchangeable replacement keyboards became cheap, that's when. So I'll say '1990' to be arbitrarily precise.