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VT05

The VT05 is the first free-standing CRT computer terminal from Digital Equipment Corporation introduced in 1970. Famous for its futuristic styling, the VT05 presents the user with an upper-case-only ASCII character display of 72 columns by 20 rows.[3] The VT05 was a smart terminal that provides cursor addressing using a series of control characters, one of which allows the cursor to be positioned at an absolute location on the screen.[3] This basic system provided the basis of similar systems in the later and greatly improved VT50 and VT52 series.[3]

VT05
DeveloperDigital Equipment Corporation
TypeVideo terminal
Release date1970 (1970)
CPUDiscrete logic
DisplayNational Semiconductor MM5240[1][2]
SuccessorVT50
"VT-05" can also refer to Vermont's 5th congressional district.

The terminal only supports forward scrolling and direct cursor addressing; no fancier editing functions are supported. No special character renditions (such as blinking, bolding, underlining, or reverse video) are supported.[4] The VT05 supports asynchronous communication at baud rates up to 2400 bits per second (although fill characters are required above 300 bits per second).

Internally, the VT05 implements four "quad-sized" DEC modules in a standard form-factor DEC backplane. The cards are mounted nearly horizontally over an off-the-shelf CRT monitor.[4] The terminal is 19" wide and 30" deep (much deeper than a typical desk).[3]

The keyboard used advanced capacitive sensors, but this proved to be unreliable and later keyboards use a simple four-contact mechanical switch.

The VT05's dynamic storage is a PMOS shift register; the delays associated with manipulating data in the shift register result in the VT05 requiring fill characters after each line feed (as compared to contemporaneous hard copy terminals which require fill characters after each carriage return).[4]

The VT05 also has the capability of acting as a black-and-white RS-170-standard video monitor for videotape recorders, cameras, and other sources. The VT05 is equipped with a video input, and can superimpose its text over the displayed video, making it suitable for interactive video systems.

The VT05 was eventually superseded by the VT50 which itself was quickly superseded by the VT52.

Commands edit

The VT05 has a limited command set:

Decimal Control Char ASCII VT05 name Function
7 ^G BEL BELL Produce an audible tone on an electronic speaker, for 266 ms at 780 Hz (G5).
8 ^H BS C← Move cursor left one space.
9 ^I HT TAB Horizontal tab. Move cursor forward to next tab stop. Stops are fixed at every eight characters.
10 ^J LF LF Line feed. Move cursor down one line. If in last line, scroll screen contents up one line instead.
11 ^K VT C↓ Move cursor down one line.
13 ^M CR CR Carriage return (move cursor to leftmost column of the current line)
14 ^N SO CAD Direct cursor addressing. Move cursor to line and column specified by the two characters that follow, 31+Y then 31+X (top line and leftmost columns are numbered one.)
24 ^X CAN C→ Move cursor right one space.
26 ^Z SUB C↑ Move cursor up one line.
29 ^] GS HOME Move cursor to top line, leftmost column.
30 ^^ RS EOL Erase to end of line (including character at the cursor). Cursor remains at current location.
31 ^_ US EOS Erase to end of screen (i.e., erase chars at or after cursor on current line and all chars on lines below current line). Cursor remains at current location.

The screen can be cleared by sending HOME and then EOS.[5]

References edit

  1. ^ MOS Integrated Circuits (PDF). National Semiconductor. Feb 1972. pp. 99–102.
  2. ^ VT05 Alphanumeric display terminal engineering drawings (PDF). Digital Equipment Corporation. 1971.
  3. ^ a b c d "Digital's Video Terminals – VT100.net". vt100.net.
  4. ^ a b c "VT05 Alphanumeric Terminal Reference Manual" (PDF). pdp8online.com.
  5. ^ BASIC-PLUS Manual, DEC, 1972, pp. 12–19

External links edit

  • VT100 net
  • DEC VT05, Terminals Wiki
  • DEC VT05 terminal emulator for Windows, supports serial ports, telnet, and raw TCP: kgober/VT05, 2019-08-20, retrieved 2020-01-11

vt05, first, free, standing, computer, terminal, from, digital, equipment, corporation, introduced, 1970, famous, futuristic, styling, presents, user, with, upper, case, only, ascii, character, display, columns, rows, smart, terminal, that, provides, cursor, a. The VT05 is the first free standing CRT computer terminal from Digital Equipment Corporation introduced in 1970 Famous for its futuristic styling the VT05 presents the user with an upper case only ASCII character display of 72 columns by 20 rows 3 The VT05 was a smart terminal that provides cursor addressing using a series of control characters one of which allows the cursor to be positioned at an absolute location on the screen 3 This basic system provided the basis of similar systems in the later and greatly improved VT50 and VT52 series 3 VT05DeveloperDigital Equipment CorporationTypeVideo terminalRelease date1970 1970 CPUDiscrete logicDisplayNational Semiconductor MM5240 1 2 SuccessorVT50 VT 05 can also refer to Vermont s 5th congressional district The terminal only supports forward scrolling and direct cursor addressing no fancier editing functions are supported No special character renditions such as blinking bolding underlining or reverse video are supported 4 The VT05 supports asynchronous communication at baud rates up to 2400 bits per second although fill characters are required above 300 bits per second Internally the VT05 implements four quad sized DEC modules in a standard form factor DEC backplane The cards are mounted nearly horizontally over an off the shelf CRT monitor 4 The terminal is 19 wide and 30 deep much deeper than a typical desk 3 The keyboard used advanced capacitive sensors but this proved to be unreliable and later keyboards use a simple four contact mechanical switch The VT05 s dynamic storage is a PMOS shift register the delays associated with manipulating data in the shift register result in the VT05 requiring fill characters after each line feed as compared to contemporaneous hard copy terminals which require fill characters after each carriage return 4 The VT05 also has the capability of acting as a black and white RS 170 standard video monitor for videotape recorders cameras and other sources The VT05 is equipped with a video input and can superimpose its text over the displayed video making it suitable for interactive video systems The VT05 was eventually superseded by the VT50 which itself was quickly superseded by the VT52 Commands editThe VT05 has a limited command set Decimal Control Char ASCII VT05 name Function 7 G BEL BELL Produce an audible tone on an electronic speaker for 266 ms at 780 Hz G5 8 H BS C Move cursor left one space 9 I HT TAB Horizontal tab Move cursor forward to next tab stop Stops are fixed at every eight characters 10 J LF LF Line feed Move cursor down one line If in last line scroll screen contents up one line instead 11 K VT C Move cursor down one line 13 M CR CR Carriage return move cursor to leftmost column of the current line 14 N SO CAD Direct cursor addressing Move cursor to line and column specified by the two characters that follow 31 Y then 31 X top line and leftmost columns are numbered one 24 X CAN C Move cursor right one space 26 Z SUB C Move cursor up one line 29 GS HOME Move cursor to top line leftmost column 30 RS EOL Erase to end of line including character at the cursor Cursor remains at current location 31 US EOS Erase to end of screen i e erase chars at or after cursor on current line and all chars on lines below current line Cursor remains at current location The screen can be cleared by sending HOME and then EOS 5 References edit MOS Integrated Circuits PDF National Semiconductor Feb 1972 pp 99 102 VT05 Alphanumeric display terminal engineering drawings PDF Digital Equipment Corporation 1971 a b c d Digital s Video Terminals VT100 net vt100 net a b c VT05 Alphanumeric Terminal Reference Manual PDF pdp8online com BASIC PLUS Manual DEC 1972 pp 12 19External links editVT100 net DEC VT05 Terminals Wiki DEC VT05 terminal emulator for Windows supports serial ports telnet and raw TCP kgober VT05 2019 08 20 retrieved 2020 01 11 Retrieved from https en wikipedia org w index php title VT05 amp oldid 1219951297, wikipedia, wiki, book, books, library,

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