Well, no matter what values I set for field(0x18) - the data dial doesn't change at all.
Could it be that this data dial is a digital port (instead of analog)? IIRC I've seen in ioport.cpp that this set_value() only works for analog ports!?

But no problem, I don't want to annoy you (and me) any longer, so I give up now.
I only needed to change the data dial for using the Edit-Mode (Player-Player) - a function that would be useful but not absolutely necessary.
More important was your first hint about clear_value() to reactivate the cursor keys again!

Thanks for your help,
Franz

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