Electronics Repair Questions? Ask an Electronics Technician
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Those bad characters look like Unicode, just a little.
Is the 'bad' register in any sort of verified working condition, recently? and, when you enter characters, are you in the right mode? in the wrong mode, what you enter could be interpreted as Unicode, or as the wrong character set, etc.
You may have to try a reset of the cash register that is 'bad', but that would require reprogramming it from scratch.
If the first transfer of a .900 file does not work, try it over again, from the start. Perhaps the first try got corrupted in transit somehow.
I don't have any further advice to offer on this problem, I'm sorry to say, except to try a reset to factory conditions or default conditions of the register with the problem, then re-do the programming from scratch.
In case another Expert has a better idea or quicker-to-the-goal sort of idea on this problem, that would work for you, I have Opted Out, opening the case to other Experts in this category, on that note.