******************************
USB keyboard in Point of Sale.
******************************
Module to connect an additional usb keyboard for Point of Sale.
================================================================
The processed keys:
----------------------------
=========== ===================== =================

type        additional keyboard   basic keyboard  

=========== ===================== =================

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

=========== ===================== =================