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Getchar and PutChar

I am trying to program in assembly for the HCS12 and need to learn how to use the getchar and putchar. I did the examples I found in a book, but that does not really go into detail as to how to use them. I am trying to get an interactive adder that keeps a running sum of numbers input by the user and outputs the total when the user hits the enter key without entering a number. Any help would be greatly appreciated.
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