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Barcode reader
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=== Proprietary interfaces === There are a few other less common interfaces. These were used in large [[Point of sale|EPOS]] systems with dedicated hardware, rather than attaching to existing commodity computers. In some of these interfaces, the scanning device returned analog signal proportional to the intensities seen while scanning the barcode. This was then decoded by the host device. In some cases the scanning device would convert the symbology of the barcode to one that could be recognized by the host device, such as [[Code 39]].
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