VT420
Encyclopedia
The VT420 was a computer terminal
designed by Digital Equipment Corporation
(DEC). Introduced in 1990, it fit up to 50 lines on the screen and supported two sessions, either one through each communication port, or by multiplexing two sessions on one line with a suitable terminal server. From a software point of view, it allowed the creation of windows on the screen by supporting rectangle operations and left and right margins for the first time.
All DEC terminals that came after the VT100
, including the VT420, are able to emulate their ancestor, although they offer new features in addition to what the VT100 could do.
The VT340 (capable of ReGIS
and Sixel
graphics, but not responding to DP6429/ECMA-48 color text controls) was apparently retained in the product line alongside the VT420 until the VT525 was introduced as the color graphics terminal.
Computer terminal
A computer terminal is an electronic or electromechanical hardware device that is used for entering data into, and displaying data from, a computer or a computing system...
designed by Digital Equipment Corporation
Digital Equipment Corporation
Digital Equipment Corporation was a major American company in the computer industry and a leading vendor of computer systems, software and peripherals from the 1960s to the 1990s...
(DEC). Introduced in 1990, it fit up to 50 lines on the screen and supported two sessions, either one through each communication port, or by multiplexing two sessions on one line with a suitable terminal server. From a software point of view, it allowed the creation of windows on the screen by supporting rectangle operations and left and right margins for the first time.
All DEC terminals that came after the VT100
VT100
The VT100 is a video terminal that was made by Digital Equipment Corporation . Its detailed attributes became the de facto standard for terminal emulators.-History:...
, including the VT420, are able to emulate their ancestor, although they offer new features in addition to what the VT100 could do.
The VT340 (capable of ReGIS
ReGIS
ReGIS, short for "Remote Graphic Instruction Set", was a vector graphics markup language developed by Digital Equipment Corporation for later models of their famous VT series of computer terminals. ReGIS supported rudimentary vector graphics consisting of lines, circular arcs, and text...
and Sixel
Sixel
Sixel is a bitmap graphics format supported by terminals and printers from DEC, most notably the VT320 and VT420. It encodes bitmaps into a character-based format that is easy to interpret, allowing it to be printed on a dot matrix printer with limited internal decoding.-Description:Sixel encodes...
graphics, but not responding to DP6429/ECMA-48 color text controls) was apparently retained in the product line alongside the VT420 until the VT525 was introduced as the color graphics terminal.