I think the devices _delirium is talking about aren't point of sale devices per se.

In Japan, most chain izakaya (restaurants that serve a wide variety of food an drink) have devices that waiters punch your order into instead of writing it down or remembering it. This is especially useful there, as it is common to go with large groups of people (6 to 20+), and the menu often has about 100 different food items on it.

In addition to staff operated devices, some restaurants have consoles where you can order your food from by navigating a software menu.