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1. Design Procedure - Adder - Subtracter - Code Conversion
Input: 2 digits + 1-bit carry Output: 1 digit + 1-bit carry) Since each input digit does not exceed 9, the output sum cannot be greater than 9 + 9 + 1 = 19, the 1 in the sum being an input carry. Suppose we apply two BCD digits to a four-bit binary adder. The adder will form the sum in binary and produce a result that ranges from 0 through 19.
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