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'''Binary-coded decimal''' ('''BCD''') is the most common way of encoding [[decimal]] digits in [[computing]] and in [[electronics|electronic]] systems. In BCD, a [[numerical digit|digit]] is usually represented by four (binary) [[bit]]s, 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.)
==Basics==
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'''8''' 1000 1011 1110 1000 1000
'''9''' 1001 1100 1111 1111 1001
==See also==
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