Albrecht Schlosser schrieb:
> I'm looking for a keyboard extension or a special function keyboard
> that can be used to type special keys normally not found on a standard
> computer keyboard, or maybe a keyboard extension that can be used
> with FLTK.

For a vending machine I once designed an additional customers keyboard:

I used single keys on a pcb and a controller to send the keys by RS232. 
The software (yes, uses FLTK ;o) opens the RS232-Port and reads the keys 
different from main keyboard to a special application (POS).


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