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2. Binary-coded decimal - Wikipedia

   en.wikipedia.org/wiki/Binary-coded_decimal

   This scheme can also be referred to as Simple Binary-Coded Decimal (SBCD) or BCD 8421, and is the most common encoding. [12] Others include the so-called "4221" and "7421" encoding – named after the weighting used for the bits – and "Excess-3". [13]

3. BCD (character encoding) - Wikipedia

   en.wikipedia.org/wiki/BCD_(character_encoding)

   BCD (binary-coded decimal), also called alphanumeric BCD, alphameric BCD, BCD Interchange Code, [ 1 ] or BCDIC, [ 1 ] is a family of representations of numerals, uppercase Latin letters, and some special and control characters as six-bit character codes. Unlike later encodings such as ASCII, BCD codes were not standardized.

4. Aiken code - Wikipedia

   en.wikipedia.org/wiki/Aiken_code

   The Aiken code (also known as 2421 code) [1][2] is a complementary binary-coded decimal (BCD) code. A group of four bits is assigned to the decimal digits from 0 to 9 according to the following table. The code was developed by Howard Hathaway Aiken and is still used today in digital clocks, pocket calculators and similar devices [citation needed].

5. Gray code - Wikipedia

   en.wikipedia.org/wiki/Gray_code

   It is known today that such codes do exist for n = 2, 5, 6, 7, and 8, ... The following binary-coded decimal (BCD) codes are Gray code variants as well:

6. Double dabble - Wikipedia

   en.wikipedia.org/wiki/Double_dabble

   Double dabble. In computer science, the double dabble algorithm is used to convert binary numbers into binary-coded decimal (BCD) notation. [1][2] It is also known as the shift-and-add -3 algorithm, and can be implemented using a small number of gates in computer hardware, but at the expense of high latency. [3]

7. Binary code - Wikipedia

   en.wikipedia.org/wiki/Binary_code

   Binary-coded decimal (BCD) is a binary encoded representation of integer values that uses a 4-bit nibble to encode decimal digits. Four binary bits can encode up to 16 distinct values; but, in BCD-encoded numbers, only ten values in each nibble are legal, and encode the decimal digits zero, through nine. The remaining six values are illegal and ...