You're going to fight an uphill battle on that one.
In my experience the general public's notion of "general purpose computing" is "Well, my phone can do everything I need, isn't that general purpose computing?"
Is something that's being said only in advertisements, or by people conditioned by modern mass market tech to feel helpless, and define their needs as subset of what they know how to do on their device. In my meatspace circles, the people who say "oh my phone does everything that I need" tend to regularly ask me to help them with stuff they need, but their phone (or their knowledge of it) is, in fact, insufficient for.
