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Steady high on all those pins on UF9.
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Steady high states on all those pins is consistent with you having the same character repeating over and over again, although it's not quite clear why 11111111 would translate to ';'.
Next up, look for activity on the A0 to A9 pins of UF8 (5,6,7,4,3,2,1,17,16,15). Do you see activity, or steady states, on those pins?