There&#x27;s seems to be an emulator for everything these days. This is not the point. A physical calculator (and not a touch-screen app on a tablet) has something that the surrogate doesn&#x27;t.<p>For one thing it does not require you to do GUI context switching. It does not compete for mouse (or keyboard) with the other tens of open programs. I find this invaluable.<p>On the other hand, touch screens take away tactile feedback. This gives the same bland taste as the soft power-off switches.