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The VT420 also added a number of more minor features. One was to add a number of PC character sets, allowing the terminal to be used with a variety of PC programs. Another allows the terminal to generate the proper character sequences to produce rectangular-area commands. For instance, one can select
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with a resolution of 800 (horizontal) by 400 (vertical) pixels. A variety of glyphs are available that provide 80 or 132 characters across, and 24, 36 or 48 lines of text vertically. The screen has room for 25 lines at normal font sizes, but the last line was normally used for status indications,
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ports. Using either method, the VT330/340/420 can either show the two sessions behind each other, using a key sequence to flip back and forth, or split the screen horizontally to display the sessions one above the other, or vertically side-by-side.
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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
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a rectangular area and fill it with a particular character, or blank it out. This is in addition to the terminal-side editing system introduced on the VT300s.
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The VT420 is essentially an updated VT320, adding the multi-session capabilities originally introduced on the VT330 and VT340.
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graphics and color support. The entire lineup of VT300s and VT420 was eventually replaced by the relatively unknown
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system, which swaps out single characters in 7-bit modes to allow basic changes like swapping the
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which allows two sessions to be multiplexed over a single serial connection to a compatible
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Known as SSU when referring to the terminal side of the same system.
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140:(DEC). The 420 is the only model in the 400 series, replacing the
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DEC Video
Terminals—The VT100 and its Successors
16:
Computer terminal from
Digital Equipment Corporation
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314:
265:Installing and Using the VT420 Video Terminal
167:Those two models include a system known as
371:
321:
307:
25:
196:system. Likewise, it also supports the
1273:Computer-related introductions in 1990
1255:
211:All DEC terminals that came after the
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930:Digital Storage Systems Interconnect
1004:Dynamically Redefined Character Set
13:
950:Synchronous Backplane Interconnect
198:National Replacement Character Set
14:
1284:
277:
271:VT420 Programmer Reference Manual
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1227:
1226:
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226:The screen itself is a 14" flat
1144:Maintenance Operations Protocol
245:
159:
1:
1034:Mass Storage Control Protocol
330:Digital Equipment Corporation
258:
138:Digital Equipment Corporation
1124:Digital Federal Credit Union
346:(founder and CEO, 1957–1992)
290: (archived June 6, 2008)
7:
1268:Character-oriented terminal
1168:Sequence and Batch Language
1129:Dynamic debugging technique
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1159:Record Management Services
945:Standard Disk Interconnect
79:80x24 or 132x24 characters
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1193:The Ultimate Entrepreneur
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856:DIGITAL Command Language
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1182:Systems Research Center
1177:System Reference Manual
208:for use on UK systems.
1263:DEC computer terminals
1149:On-line Debugging Tool
136:introduced in 1990 by
1139:Local Area Transport
897:National Replacement
999:Digital Linear Tape
358:(VP of engineering)
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1222:Computers template
156:starting in 1993.
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223:emulating modes.
134:computer terminal
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88:Computer keyboard
51:Computer terminal
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1078:Related topics
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1059:Star coupler
955:TURBOchannel
801:Digital UNIX
664:
352:(co-founder)
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210:
190:VT200 series
186:
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154:VT500 series
126:
124:
94:Connectivity
57:Release date
37:Manufacturer
811:Programming
524:Alpha 21464
519:Alpha 21364
514:Alpha 21264
504:Alpha 21164
487:Alpha 21064
356:Gordon Bell
273:, DEC, 1992
267:, DEC, 1990
233:⇪ Caps Lock
160:Description
104:Predecessor
1257:Categories
1117:HP-Interex
540:MicroPRISM
389:processors
337:Key people
259:References
1090:AltaVista
994:DECwriter
965:VAXBI bus
912:Technical
888:(Turkish)
851:VAX MACRO
813:languages
699:Operating
581:VT50/VT52
561:terminals
545:StrongARM
344:Ken Olsen
294:vt100.net
114:Successor
31:DEC VT420
1232:Category
1101:CPU Wars
1019:Gold key
976:hardware
902:RADIX 50
841:MACRO-11
836:MACRO-10
559:Computer
204:for the
1242:Commons
1154:PALcode
1039:PALcode
1009:Firefly
989:DECtape
984:DECtalk
935:Massbus
882:(Greek)
821:BASIC-8
781:VAX/VMS
776:TOPS-20
724:TOPS-10
701:systems
508:21164PC
286:at the
72:Display
62: (
1187:TD/SMP
1107:DECnet
1095:Compaq
974:Other
960:Unibus
892:Hebrew
791:Ultrix
786:VAXELN
771:DSM-11
759:RSX-11
754:RSTS/E
744:DOS-11
729:RSX-15
714:4K DMS
709:DECsys
685:(1994)
679:(1993)
673:(1990)
671:VT1000
667:(1990)
651:(1987)
635:(1983)
599:(1978)
583:(1975)
577:(1972)
571:(1970)
462:Mariah
405:LSI-11
398:PDP-11
169:TD/SMP
129:is an
98:RS-232
1204:WPS-8
1199:VT640
1172:Sixel
1164:ReGIS
1134:FX!32
1112:DECUS
1085:AdvFS
1029:LK421
1024:LK201
940:Q-Bus
846:MUMPS
831:FOCAL
826:DIBOL
749:RT-11
734:TSS/8
689:VT525
683:VT520
677:VT510
665:VT420
660:VT340
655:VT330
649:VT320
644:VT241
639:VT240
633:VT220
628:VT180
623:VT131
618:VT105
613:VT103
608:VT102
603:VT101
597:VT100
533:Other
497:21068
492:21066
479:Alpha
457:Rigel
239:Notes
231:like
217:VT100
213:VT100
202:#
194:Sixel
150:Sixel
146:ReGIS
142:VT320
127:VT420
118:VT520
108:VT320
84:Input
20:VT420
1069:TU81
1054:RL02
1049:RK05
1044:RA90
796:MICA
739:OS/8
592:VT62
587:VT55
575:GT40
569:VT05
469:NVAX
445:CVAX
435:V-11
417:J-11
412:T-11
408:F-11
221:VT52
219:and
148:and
125:The
75:14"
64:1990
60:1990
47:Type
764:IAS
719:COS
450:SOC
427:VAX
228:CRT
177:MMJ
77:CRT
41:DEC
1259::
510:)
506:(
386:,
322:e
315:t
308:v
206:£
66:)
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