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BCD

Numerous different codes can be obtained by arranging four bits in 10 distinct combinations. The bit assignment most commonly used for the decimal digits is the straight binary assignment listed in the first 10 entries of Table 3-3. This particular code is called binary-coded decimal and is  commonly referred to by its abbreviation BCD.

It is very important to understand the difference between the conversion of decimal numbers into binary and the binary coding of decimal numbers. For example, when converted to a binary number, the decimal number 99 is represented by the string of bits 1100011, but when represented in BCD, it becomes 1001 1001. The only difference between a decimal number represented by the familiar digit symbols 0, 1, 2,..., 9 and the BCD symbols 0001, 0010, ...,1001 is in the symbols used to represent the digits-the number itself is exactly the same. A few decimal numbers and their representation in BCD are listed in Table 3-3.

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