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Definitions of binary coded decimal:

A method of encoding decimal digits into four binary bits.
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(system/code) A coding system in which each decimal digit from 0 to 9 is represented by four bits.
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A decimal number in which each digit is represented separately by four binary digits eg24 is repesented as 0010 0100.
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Four bit code representing the numbers zero through nine in binary. Shortcut for entering many binary numbers into a machine language program.
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Binary-coded decimal (BCD) is, after character encodings, the most common way of encoding decimal digits in computing and in electronic systems. In BCD, a digit is usually represented by four (binary) bits, of which the leftmost (written conventionally) has value 8, and the remaining three have values 4, 2, and 1. Only the combinations of these bits which, when summed, have values in the range 0-9 are valid. (Other combinations are sometimes used for sign or other indications.)
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