In computing and electronic systems, binary-coded decimal (BCD) is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of bits, usually four or eight, although other sizes (such as six bits) have been used historically. Special bit patterns are sometimes used for a sign or for other indications ...
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http://en.wikipedia.org/wiki/Binary-coded_decimal
A method of encoding decimal digits into four binary bits.
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http://www.encyclo.co.uk/local/20505
A number system where each decimal digit is separately represented by a 4-bit binary code;for examplethe decimal number 23 is represented as 0010 0011 (2 = 0010 and 3 = 0011, grouped together as shown), while in straight binary notation, 23 is represented as 10111.
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https://www.encyclo.co.uk/local/20687
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