Casio has getKey just like TI-BASIC. However, I don't think there's no cursor stuff in CASIO.
For input, are you talking about Input in TI-BASIC? For CASIO, all you need is, ?→Stuff
When Input is used on z80 calcs without an argument, it displays a cursor on the graph screen that the user can use to select coordinates. This is very different from using it with an argument.