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USB keyboard in Point of Sale.
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Module to connect an additional usb keyboard for Point of Sale.
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The processed keys:
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type        additional keyboard   basic keyboard  

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numChar     0-9                   0-9
mode qty    ``/``                 ``q``
mode disk   ``-``                 ``d``
mode price  ``*``                 ``p``
backspace   backspace             backspace
dot         ``.``                 ``.``

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