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The LK201 keyboard supplied with the VT220 was one of the first full-length, low-profile keyboards available; it was developed at DEC's Roxbury, Massachusetts facility. It was much smaller and lighter than the VT100s version, and connected to the terminal using a lighter and more flexible coiled cable and a telephone jack connector.
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 National Replacement Character Set (NRCS) was a feature supported by later models of Digital's (DEC) computer terminal systems, starting with the VT200 series in 1983. . NRCS allowed individual characters from one character set to be replaced by one from another set, allowing the construction of different character sets on the
It was an 8-bit extension of ASCII that added accented characters, currency symbols, and other character glyphs missing from 7-bit ASCII. It is only one of the code pages implemented for the VT220 National Replacement Character Set (NRCS). [1] [2] MCS is registered as IBM code page/CCSID 1100 (Multinational Emulation) since 1992.
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.
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 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.
[2] [3] Each xterm window is a separate process, but all share the same keyboard, taking turns as each xterm process acquires focus. Normally focus switches between X applications as the user moves the pointer (e.g., a mouse cursor) about the screen, but xterm provides options to grab focus (the Secure Keyboard feature) as well as accept input ...