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Later printers such as the IBM 3211 and IBM 4248 did away with the physical carriage control tape and used an electronic Forms Control Buffer (FCB) instead. ASA carriage control characters are still used for printer output from mainframe applications and software today. They are interpreted by drivers and other software before being printed on ...
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.
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 ...
The RPL character set is an 8-bit character set and encoding used by most RPL calculators manufactured by Hewlett-Packard as well as by the HP 82240B thermal printer. [1] [2] It is sometimes referred to simply as "ECMA-94" in documentation, [1] [3] although it is for the most part a superset of ISO/IEC 8859-1 / ECMA-94 in terms of printable characters, and it differs from ISO/IEC 8859-1 by ...
Line printers frequently used a variety of discharge brushes and active (corona discharge-based) static eliminators to discharge these accumulated charges. Many printers supported ASA carriage control characters [citation needed] which provided a limited degree of control over the paper, by specifying how far to advance the paper between ...
When Hewlett-Packard introduced the HP-42S in 1988, the FOCAL character set was revised to include more characters, including a number of characters already provided by the HP 82240A infrared thermo printer, which had been introduced in 1986, [5] as part of its extended variant of the 1985 revision of the HP Roman-8 character set, [6] [7] although at completely different code points.
Hewlett-Packard uses a similar concept in its HP-UX operating system and its Printer Command Language [7] (PCL) protocol for printers (either for HP printers or not). The terminology, however, is different: What others call a character set, HP calls a symbol set, and what IBM or Microsoft call a code page, HP calls a symbol set code.