Why is TUI used in stores?

In many big stores/rental/service companys the system they are using for managing customers and looking up products is based on a Text User Interface (TUI). Are there any reason开发者_JAVA技巧 why they choose TUI over GUI or is it just old systems?

From my experience, it's just old systems. If the old system still works, many companies don't see why they should spend a lot of money only to get the TUI replaced by a GUI.

Now is 2017 and TUI is still widely used in stores, gas-stations, etc...

I personally find TUI (specially TurboVision based apps) much more eye-appealing then too rich GUI apps. Also, by looking into how users use TUI apps (mostly spend time with numerical keyboards without need for mouse) I get the feeling they are faster in using TUI.