Edzard Egberts schrieb:
> 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).
>

The main problem would be the pcb and the keys, for controller today I 
would use one of them  http://arduino.cc/en/Main/Products (for little 
amount of pieces) - they are very easy to program (C++!), so there is no 
"controller development" to do.
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