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My first question is what keyboard? Does the keyboard have a parallel or a serial output? I'd guess it's serial or the answer would be obvious. Next, I'd ask, when you press a key, what comes out? How many bits make up a character? What size is the barcode? Is the barcode scanned at a fixed rate, or will the rate vary? If the rate varies, then how do you know when one number begins and ends? The keyboard's output will be clocked at a fixed bit rate that should never vary. Hence, that fact may get you somewhere in differentiating a keyboard's output from a barcode scanner's.