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DEC VT220 in use at The National Museum of Computing DEC VT240. The VT200 series is a family of computer terminals introduced by Digital Equipment Corporation (DEC) in November 1983. [1] [2] The VT220 was the basic version, a text-only version with multi-lingual capabilities.
It is based on the 1983 DEC Multinational Character Set (MCS) for VT220 terminals. As such, LICS is also similar to two other descendants of MCS, the ECMA-94 character set of 1985 [1] and the ISO 8859-1 (Latin-1) character set of 1987. LICS was first introduced as the character set of Lotus 1-2-3 Release 2 for DOS in 1985.
The Multinational Character Set (DMCS or MCS) is a character encoding created in 1983 by Digital Equipment Corporation (DEC) for use in the popular VT220 terminal. It was an 8-bit extension of ASCII that added accented characters, currency symbols , and other character glyphs missing from 7-bit ASCII.
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.
[1] [2] On an 8-bit clean serial link, ASCII can be expanded to support a total of 256 characters. In this case, instead of replacing the characters in the original printable characters range from 32 to 127, new characters are added in the 128 to 255 range. This offers enough room for a single character set to include all the variety of ...
The VT420 has a total of 5 sets of 94 characters for normal VT operation, another 3 sets of 128 PC characters, and 1 set of 96 characters containing various graphics and math symbols. Like all models since the VT200 series , the user can also upload a custom character set of their own design using the Sixel system.
Early versions emulated the VT102 and Tektronix 4014. [8]Later versions added control sequences for DEC and other terminals such as: . VT220: Added in patch 24. [9] Later, in 1998, xterm added support for VT220 features, such as extending its support of ISO-2022 shift functions to provide the National Replacement Character Set feature.
The VT320 is the text-only version, while the VT330 adds monochrome ReGIS, Sixel and Tektronix 4010 graphics, and the VT340 adds color. The 300 series replaced the earlier VT200 series , as a lower-cost system better able to compete with a number of VT220 clones that had entered the market.