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In 1973, ECMA-35 and ISO 2022 [18] attempted to define a method so an 8-bit "extended ASCII" code could be converted to a corresponding 7-bit code, and vice versa. [19] In a 7-bit environment, the Shift Out would change the meaning of the 96 bytes 0x20 through 0x7F [a] [21] (i.e. all but the C0 control codes), to be the characters that an 8-bit environment would print if it used the same code ...
Code 127 (DEL, a.k.a. "rubout") is likewise a special case. Its 7-bit code is all-bits-on in binary, which essentially erased a character cell on a paper tape when overpunched. Paper tape was a common storage medium when ASCII was developed, with a computing history dating back to WWII code breaking equipment at Biuro Szyfrów. Paper tape ...
The BIOS keyboard driver produced Backspace when the backspace key was typed and NUL with scan code 0x53 when the delete key was typed. [8] In Windows the delete key maps to VK_DELETE (0x2E). [ 9 ] EGA/VGA fonts , as fonts used by Win32 console , usually have the "house" symbol ⌂ at 127 (0x7F) code point, see Code page 437 for details.
To demonstrate the value of the escape sequence feature, to output the text Foo on one line and Bar on the next line, the code must output a newline between the two words. The following code achieves the goal via text formatting and a hard-coded ASCII character value for newline (0x0A). This behaves as desired with the words on sequential lines ...
Many Unicode characters are used to control the interpretation or display of text, but these characters themselves have no visual or spatial representation. For example, the null character (U+0000 NULL) is used in C-programming application environments to indicate the end of a string of characters.
An early typewriter with a backspacer[sic] key.(Blickensderfer Model 7)Although the term "backspace" is the traditional name of the key which steps the carriage back and/or [note 3] deletes the previous character, typically to the left of the cursor, the actual key may be labeled in a variety of ways, for example delete, [1] erase, [note 4] or with a left pointing arrow. [3]
Number of symbols Range of characters C0 controls: 32 control codes: U+0000 to U+001F ASCII punctuation and symbols: 33 punctuation marks and symbols: U+0020 to U+002F, U+003A to U+0040, U+005B to U+0060 and U+007B to U+007E ASCII digits: 10 digits: U+0030 to U+0039 Uppercase Latin Alphabet: 26 unaccented Latin letters in the majuscule. U+0041 ...
Generally, an escape character is not a particular case of (device) control characters, nor vice versa.If we define control characters as non-graphic, or as having a special meaning for an output device (e.g. printer or text terminal) then any escape character for this device is a control one.