Computer Braille Code: Difference between revisions

Revision as of 18:49, 30 December 2015

Revision as of 18:55, 30 December 2015

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There are two standards of representation of computer code with braille:

1) The '''Computer Braille Code''' as defined by the [[Braille Authority of North America]].<ref>{{cite book|title=Computer Braille Code: 2000 Revision|date=2000|publisher=Braille Authority of North America|url=http://www.brailleauthority.org/cbc/cbc.html}}</ref> It employs only the 6-dot braille patterns to represent all code points of [[ASCII]] as well as many technical characters and commands. It is virtually identical to the [[Braille ASCII]], a system of representation of braille with ASCII characters, which goal is mirrored to the Computer Braille Code. To represent ASCII code points 0x60, 0x7B, 0x7C, 0x7D, 0x7E as well as capital letters the 4-5-6 character is used as the shift indicator or modificatormodifier. Thus, {{code|`}} (grave accent, 0x60) is represented by {{braille cell|456}}{{braille cell|4}}, where {{braille cell|4}} is assigned to {{code|@}} (at sign, 0x40). In other words, {{braille cell|456}} either adds or substractssubtracts 32 to or from the ASCII value of the following character. Unlike Braille ASCII {{code|_}} (underscore, 0x40) is represented by {{braille cell|456}}{{braille cell|456}}.

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2) The '''Braille Computer Notation''' as defined by the [[Braille Authority of the United Kingdom]].<ref>{{cite book|title=Braille Computer Notation|date=2006|publisher=Braille Authority of the United Kingdom (Computer Committee)|url=http://www.ukaaf.org/wp-content/uploads/2015/05/Braille-Computer-Notation-PDF.pdf}}</ref> In this notation both 6- and 8-dot patterns may be used. With the 6-dot code various combinations of braille characters can represent many technical, mathematical and logical symbols. The {{braille cell|5}} character is used as a universal modificatormodifier. The 8-dot code is designed that its 6-dot subset is identical to the 6-dot code. The remainder are assigned by the following rules:

:* adding dot 7 subtracts 32 from the ASCII value;