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DEC Special Graphics

From Wikipedia, the free encyclopedia
Special graphics used to draw boxes
DEC Special Graphics
A modified DEC Special Graphics set (with additional fill blocks and arrows, and without the control pictures) accessed in aLinux terminal usingShift Out
Alias(es)IBM-1090
Based onASCII

DEC Special Graphics[1] is a 7-bitcharacter set developed byDigital Equipment Corporation. This was used very often to drawboxes on theVT100 video terminal and the many emulators, and used by bulletin board software. Thedesignation escape sequenceESC ( 0 (hexadecimal1B 28 30) switched the codes for lower-case ASCII letters to draw this set, and the sequenceESC ( B (hexadecimal1B 28 42) switched back.[2]IBM calls itCode page 1090.[3]

Character set

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DEC Special[1][3]
0123456789ABCDEF
5xNBSP
6x◆▒[a]␉␌␍␊°±␤␋┘┐┌└┼⎺
7x⎻─[b]⎼⎽├┤┴┬│≤≥π≠£·
  Same asASCII (not shown)

See also

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Footnotes

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  1. ^In IBM's system of character IDs, this is SV240000,[3] not the SF150000 which is mapped toU+2592 ▒MEDIUM SHADE in other code pages such ascode page 437.[4] The reference glyph for SV240000 differs in showing a chequerboard pattern[3] rather than SF150000'sdithered shade.[4]U+1FB95 🮕CHECKER BOARD FILL, in the much more recently addedSymbols for Legacy Computing block, is explicitly a chequerboard shade.[5] In the specification forIBM Japanese Host code, SV240080 (i.e. SV240000 with thefullwidth attribute set) is mapped toU+25A6 ▦SQUARE WITH ORTHOGONAL CROSSHATCH FILL; however, the reference glyph given there for SV240080 differs from that of SV240000.[6]
  2. ^The Unicode code chart for the range U+23BA through U+23BD (the scan lines before and after this character) explicitly notes that "scan line-5 is unified with the box-drawing graphic character 2500".[7]

References

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  1. ^abDigital (1984)."Table 2-4: DEC Special Graphics Character Set".VT220 Programmer Reference Manual (2nd ed.).
  2. ^Mascheck, Sven; Le Breton, Stefan; Hamilton, Richard L."About the 'alternate linedrawing character set'".~sven_mascheck/.
  3. ^abcdIBM.Code Page 01090(PDF). Archived fromthe original(PDF) on 2015-07-08. Retrieved2020-01-08.
  4. ^abIBM.Code Page 00437(PDF).Archived(PDF) from the original on 2015-07-08.
  5. ^"Symbols for Legacy Computing"(PDF).Unicode Consortium.
  6. ^"IBM Japanese Graphic Character Set, Kanji: DBCS–Host and DBCS-PC"(PDF).IBM. 2002. C-H 3-3220-024 2002-11. Archived fromthe original(PDF) on 2020-06-02. Retrieved2021-10-29.
  7. ^"Miscellaneous Technical"(PDF).Unicode Consortium.

External links

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