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The main difference between the two sets of printer control characters might be the portability of ASA control characters versus the hardware dependency of machine control characters. The fact that the ASA controls were space before write , while the machine controls were space after write could require some data streams to be converted.
ASA control characters are simple printing command characters used to control the movement of paper through line printers. These commands are presented as special characters in the first column of each text line to be printed, and affect how the paper is advanced before the line is printed. The remainder of the line is printed starting in the ...
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 ...
Printing control characters were first used to control the physical mechanism of printers, the earliest output device. An early example of this idea was the use of Figures (FIGS) and Letters (LTRS) in Baudot code to shift between two code pages. A later, but still early, example was the out-of-band ASA carriage control characters. Later ...
Touchmaster Five with carriage return lever at left. Originally, the term "carriage return" referred to a mechanism or lever on a typewriter.For machines where the type element was fixed and the paper held in a moving carriage, this lever was on the left attached to the moving carriage, and operated after typing a line of text to cause the carriage to return to the far right so the type ...
RFC 2822 refers to control characters that do not include carriage return, line feed or white space as non-whitespace control characters. [35] Except for the control characters that prescribe elementary line-oriented formatting, ASCII does not define any mechanism for describing the structure or appearance of text within a document.
ISO-IR 158 is a supplementary ISO 2022 graphical set, containing characters which are absent in ISO-8859-10, but which are required for writing Skolt Sami or historic Sami orthographies. It is intended to be used in an ISO 4873 profile for Sami languages , as a G2 or G3 set (i.e. prefixed with 0x8E/ SS2 or 0x8F/ SS3 respectively) alongside the ...
Presentation: Control characters do not have a primary name, they are labeled like <control-0008>. Its alias name like BACKSPACE is used in the chart documentation, but never as a primary name. This prevents unintended (automated) replacement by the actual, disrupting control character.