[Wii U] Not possible run .cas files

[cucholix]

In order to run cassettes you need to type certain commands in the main screen
In this case to run Arkanoid you need type CLOAD, then RUN to start, on Wii U there's no virtual keyboard so it's not possible play this game.

The system I'm emulating is Spectravideo, and most of their games are in .cas format, only a few are in cartridge (bin) format.

The Spectravideo games run fine in standalone blueMSX PC; on Wii U (and I guess other consoles) it's stuck in the blue main screen.