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1 1625 jcastillo
The Linux kernel code has been rewritten to use Unicode to map
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characters to fonts.  By downloading a single Unicode-to-font table,
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both the eight-bit character sets and UTF-8 mode are changed to use
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the font as indicated.
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This changes the semantics of the eight-bit character tables subtly.
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The four character tables are now:
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Map symbol      Map name                        Escape code (G0)
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LAT1_MAP        Latin-1 (ISO 8859-1)            ESC ( B
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GRAF_MAP        DEC VT100 pseudographics        ESC ( 0
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IBMPC_MAP       IBM code page 437               ESC ( U
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USER_MAP        User defined                    ESC ( K
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In particular, ESC ( U is no longer "straight to font", since the font
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might be completely different than the IBM character set.  This
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permits for example the use of block graphics even with a Latin-1 font
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loaded.
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In accordance with the Unicode standard/ISO 10646 the range U+F000 to
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U+F8FF has been reserved for OS-wide allocation (the Unicode Standard
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refers to this as a "Corporate Zone", since this is inaccurate for
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Linux we call it the "Linux Zone").  U+F000 was picked as the starting
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point since it lets the direct-mapping area start on a large power of
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two (in case 1024- or 2048-character fonts ever become necessary).
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This leaves U+E000 to U+EFFF as End User Zone.
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The Unicodes in the range U+F000 to U+F1FF have been hard-coded to map
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directly to the loaded font, bypassing the translation table.  The
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user-defined map now defaults to U+F000 to U+F1FF, emulating the
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previous behaviour.  This range may expand in the future should it be
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warranted.
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Actual characters assigned in the Linux Zone
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--------------------------------------------
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In addition, the following characters not present in Unicode 1.1.4 (at
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least, I have not found them!) have been defined; these are used by
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the DEC VT graphics map:
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U+F800 DEC VT GRAPHICS HORIZONTAL LINE SCAN 1
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U+F801 DEC VT GRAPHICS HORIZONTAL LINE SCAN 3
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U+F803 DEC VT GRAPHICS HORIZONTAL LINE SCAN 7
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U+F804 DEC VT GRAPHICS HORIZONTAL LINE SCAN 9
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The DEC VT220 uses a 6x10 character matrix, and these characters form
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a smooth progression in the DEC VT graphics character set.  I have
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omitted the scan 5 line, since it is also used as a block-graphics
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character, and hence has been coded as U+2500 FORMS LIGHT HORIZONTAL.
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However, I left U+F802 blank should the need arise.
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Klingon language support
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------------------------
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Unfortunately, Unicode/ISO 10646 does not allocate code points for the
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language Klingon, probably fearing the potential code point explosion
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if many fictional languages were submitted for inclusion.  There are
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also political reasons (the Japanese, for example, are not too happy
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about the whole 16-bit concept to begin with.)  However, with Linux
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being a hacker-driven OS it seems this is a brilliant linguistic hack
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worth supporting.  Hence I have chosen to add it to the list in the
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Linux Zone.
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Several glyph forms for the Klingon alphabet has been proposed.
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However, since the set of symbols appear to be consistent throughout,
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with only the actual shapes being different, in keeping with standard
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Unicode practice these differences are considered font variants.
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Klingon has an alphabet of 26 characters, a positional numeric writing
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system with 10 digits, and is written left-to-right, top-to-bottom.
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Punctuation appears to be only used in Latin transliteration; it is
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appears customary to write each sentence on its own line, and
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centered.  Space has been reserved for punctuation should it prove
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necessary.
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This encoding has been endorsed by the Klingon Language Institute.
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For more information, contact them at:
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        http://www.kli.org/
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Since the characters in the beginning of the Linux CZ have been more
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of the dingbats/symbols/forms type and this is a language, I have
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located it at the end, on a 16-cell boundary in keeping with standard
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Unicode practice.
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U+F8D0  KLINGON LETTER A
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U+F8D1  KLINGON LETTER B
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U+F8D2  KLINGON LETTER CH
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U+F8D3  KLINGON LETTER D
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U+F8D4  KLINGON LETTER E
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U+F8D5  KLINGON LETTER GH
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U+F8D6  KLINGON LETTER H
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U+F8D7  KLINGON LETTER I
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U+F8D8  KLINGON LETTER J
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U+F8D9  KLINGON LETTER L
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U+F8DA  KLINGON LETTER M
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U+F8DB  KLINGON LETTER N
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U+F8DC  KLINGON LETTER NG
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U+F8DD  KLINGON LETTER O
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U+F8DE  KLINGON LETTER P
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U+F8DF  KLINGON LETTER Q
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        - Written  in standard Okrand Latin transliteration
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U+F8E0  KLINGON LETTER QH
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        - Written  in standard Okrand Latin transliteration
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U+F8E1  KLINGON LETTER R
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U+F8E2  KLINGON LETTER S
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U+F8E3  KLINGON LETTER T
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U+F8E4  KLINGON LETTER TLH
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U+F8E5  KLINGON LETTER U
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U+F8E6  KLINGON LETTER V
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U+F8E7  KLINGON LETTER W
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U+F8E8  KLINGON LETTER Y
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U+F8E9  KLINGON LETTER GLOTTAL STOP
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U+F8F0  KLINGON DIGIT ZERO
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U+F8F1  KLINGON DIGIT ONE
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U+F8F2  KLINGON DIGIT TWO
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U+F8F3  KLINGON DIGIT THREE
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U+F8F4  KLINGON DIGIT FOUR
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U+F8F5  KLINGON DIGIT FIVE
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U+F8F6  KLINGON DIGIT SIX
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U+F8F7  KLINGON DIGIT SEVEN
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U+F8F8  KLINGON DIGIT EIGHT
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U+F8F9  KLINGON DIGIT NINE
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Other Fictional and Artificial Scripts
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--------------------------------------
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Since the assignment of the Klingon Linux Unicode block, a registry of
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fictional and artificial scripts has been established by John Cowan,
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.  The ConScript Unicode Registry is accessible at
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http://locke.ccil.org/~cowan/csur/; the ranges used fall at the bottom
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of the End User Zone and can hence not be normatively assigned, but it
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is recommended that people who wish to encode fictional scripts use
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these codes, in the interest of interoperability.  For Klingon, CSUR
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has adopted the Linux encoding.
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        H. Peter Anvin 

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