It's much older than that. The tale is told, at least, that in the 1960s, IBM sold a model of 360 that could be upgraded to a faster model by flipping a single

It's much older than that. The tale is told, at least, that in the 1960s, IBM sold a model of 360 that could be upgraded to a faster model by flipping a single switch. They charged many thousands of dollars to send out a tech to flip the switch (if you did it yourself, I presume it would void the warranty).