A modified DEC Special Graphics set (with additional fill blocks and arrows, and without the control pictures) accessed in a
Linux terminal using
Shift Out.
DEC Special Graphics[1] is a 7-bit
character set developed by
Digital Equipment Corporation. This was used very often to draw
boxes on the
VT100 video terminal and the many emulators, and used by bulletin board software. The
designation escape sequenceESC ( 0 (
hexadecimal1B 28 30) switched the codes for lower-case ASCII letters to draw this set, and the sequence ESC ( B (hexadecimal 1B 28 42) switched back.[2]IBM calls it Code page 1090.[3]
^In IBM's system of character IDs, this is SV240000,[3] not the SF150000 which is mapped to U+2592▒MEDIUM SHADE in other code pages such as
code page 437.[4] The reference glyph for SV240000 differs in showing a chequerboard pattern[3] rather than SF150000's
dithered shade.[4]U+1FB95🮕CHECKER BOARD FILL, in the much more recently added
Symbols for Legacy Computing block, is explicitly a chequerboard shade.[5] In the specification for
IBM Japanese Host code, SV240080 (i.e. SV240000 with the
fullwidth attribute set) is mapped to U+25A6▦SQUARE WITH ORTHOGONAL CROSSHATCH FILL; however, the reference glyph given there for SV240080 differs from that of SV240000.[6]
^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]
A modified DEC Special Graphics set (with additional fill blocks and arrows, and without the control pictures) accessed in a
Linux terminal using
Shift Out.
DEC Special Graphics[1] is a 7-bit
character set developed by
Digital Equipment Corporation. This was used very often to draw
boxes on the
VT100 video terminal and the many emulators, and used by bulletin board software. The
designation escape sequenceESC ( 0 (
hexadecimal1B 28 30) switched the codes for lower-case ASCII letters to draw this set, and the sequence ESC ( B (hexadecimal 1B 28 42) switched back.[2]IBM calls it Code page 1090.[3]
^In IBM's system of character IDs, this is SV240000,[3] not the SF150000 which is mapped to U+2592▒MEDIUM SHADE in other code pages such as
code page 437.[4] The reference glyph for SV240000 differs in showing a chequerboard pattern[3] rather than SF150000's
dithered shade.[4]U+1FB95🮕CHECKER BOARD FILL, in the much more recently added
Symbols for Legacy Computing block, is explicitly a chequerboard shade.[5] In the specification for
IBM Japanese Host code, SV240080 (i.e. SV240000 with the
fullwidth attribute set) is mapped to U+25A6▦SQUARE WITH ORTHOGONAL CROSSHATCH FILL; however, the reference glyph given there for SV240080 differs from that of SV240000.[6]
^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]