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2. 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 ...

3. Braille ASCII - Wikipedia

   en.wikipedia.org/wiki/Braille_ASCII

   Braille ASCII (or more formally The North American Braille ASCII Code, also known as SimBraille) is a subset of the ASCII character set which uses 64 of the printable ASCII characters to represent all possible dot combinations in six-dot braille. It was developed around 1969 and, despite originally being known as North American Braille ASCII ...

4. Binary number - Wikipedia

   en.wikipedia.org/wiki/Binary_number

   A binary number may also refer to a rational number that has a finite representation in the binary numeral system, that is, the quotient of an integer by a power of two. The base-2 numeral system is a positional notation with a radix of 2. Each digit is referred to as a bit, or binary digit.

5. ASCII - Wikipedia

   en.wikipedia.org/wiki/ASCII

   Originally based on the (modern) English alphabet, ASCII encodes 128 specified characters into seven-bit integers as shown by the ASCII chart in this article. [12] Ninety-five of the encoded characters are printable: these include the digits 0 to 9, lowercase letters a to z, uppercase letters A to Z, and punctuation symbols.

6. List of Unicode characters - Wikipedia

   en.wikipedia.org/wiki/List_of_Unicode_characters

   A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.

7. Six-bit character code - Wikipedia

   en.wikipedia.org/wiki/Six-bit_character_code

   A six-bit character code is a character encoding designed for use on computers with word lengths a multiple of 6. Six bits can only encode 64 distinct characters, so these codes generally include only the upper-case letters, the numerals, some punctuation characters, and sometimes control characters. The 7-track magnetic tape format was ...

8. List of binary codes - Wikipedia

   en.wikipedia.org/wiki/List_of_binary_codes

   Seven-bit binary codes. Examples of seven-bit binary codes are: International Telegraph Alphabet No. 3 (ITA3) – derived from the Moore ARQ code, and also known as the RCA. ASCII – The ubiquitous ASCII code was originally defined as a seven-bit character set. The ASCII article provides a detailed set of equivalent standards and variants.

9. BCD (character encoding) - Wikipedia

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

   The BCD code is the adaptation of the punched card code to a six-bit binary code by encoding the digit rows (nine rows, plus unpunched) into the low four bits, and the zone rows (three rows, plus unpunched) into the high two bits. [4] The digit zero (a single punch in row 0) is usually handled specially in some way, and the digit code was ...