BCD (Binary Coded Decimal) - an explanation

Form of coding of each octet within cell, where each bit has one of two allowable states, 1 or 0.Short for binary-coded decimal, a format for representing decimal numbers (integers) in which each digit is represented by four bits (a nibble ). For example, the number 375 would be represented as:

0011 0111 0101

One advantage of BCD over binary representations is that there is no limit to the size of a number. To add another digit, you just need to add a new 4-bit sequence. In contrast, numbers represented in binary format are generally limited to the largest number that can be represented by 8, 16, 32 or 64 bits.

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