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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 ...
A binary number is a number expressed in the base -2 numeral system or binary numeral system, a method for representing numbers that uses only two symbols for the natural numbers: typically "0" ( zero) and "1" ( one ). A binary number may also refer to a rational number that has a finite representation in the binary numeral system, that is, the ...
A binary coderepresents text, computer processor instructions, or any other datausing a two-symbol system. The two-symbol system used is often "0" and "1" from the binary number system. The binary code assigns a pattern of binary digits, also known as bits, to each character, instruction, etc. For example, a binary stringof eight bits (which is ...
The mapping can also be computed by adding together the hexadecimal values, seen at right, of the dots raised. So the pattern with dots 1-2-5 raised would yield 1 16 +2 16 +10 16 = 13 16. Whether computed directly in hexadecimal, or indirectly via binary, the result is added to 2800 16, the offset for the Braille Patterns Unicode block.
Similarly, ASCII systems use a zone value of 0011 (hex 3), giving character codes 30 to 39 (hex). For signed zoned decimal values, the rightmost (least significant) zone nibble holds the sign digit, which is the same set of values that are used for signed packed decimal numbers (see above).
Portable bitmap binary 50 32 0A: P2␊ 0 pgm Portable Gray Map ASCII 50 35 0A: P5␊ 0 pgm Portable Gray Map binary 50 33 0A: P3␊ 0 ppm Portable Pixmap ASCII 50 36 0A: P6␊ 0 ppm Portable Pixmap binary D7 CD C6 9A: ×ÍÆš: 0 wmf Windows Metafile: 67 69 6D 70 20 78 63 66: gimp xcf: 0 xcf XCF (file format) 2F 2A 20 58 50 4D 20 2A 2F /* XPM ...
In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 ...
Code 7F hex corresponds to the non-printable "delete" (DEL) control character and is therefore omitted from this chart; it is covered in the previous section's chart. Earlier versions of ASCII used the up arrow instead of the caret (5E hex ) and the left arrow instead of the underscore (5F hex ).